<section>
 <h1 class="contains-headerlink leafygreen-ui-41fr9s" weight="medium">
  $unset (aggregation)
  <a class="headerlink leafygreen-ui-1kepx47" href="#-unset--aggregation-" title="Permalink to this heading">
   <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
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    </path>
    <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
    </path>
   </svg>
   <div class="css-1btu0w3 evvkmar0" id="-unset--aggregation-">
   </div>
  </a>
 </h1>
 <div class="leafygreen-ui-a5yxub">
  <p class="css-1cmx2d4 ef7gu8j0">
   On this page
  </p>
  <ul class="css-1qb0mst ef7gu8j1">
   <li class="leafygreen-ui-1e7a0ei">
    <a class="lg-ui-0001 leafygreen-ui-e98ikf" href="#definition" target="_self">
     <span>
      Definition
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#syntax" target="_self">
     <span>
      Syntax
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#considerations" target="_self">
     <span>
      Considerations
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#examples" target="_self">
     <span>
      Examples
     </span>
    </a>
   </li>
  </ul>
 </div>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Definition
   <a class="headerlink leafygreen-ui-1kepx47" href="#definition" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
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     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="definition">
    </div>
   </a>
  </h2>
  <div class="leafygreen-ui-15mdk4" role="note">
   <h2 class="leafygreen-ui-6n7b7d">
    Note
   </h2>
   <h3 class="leafygreen-ui-144d5kf">
    <strong>
     Disambiguation
    </strong>
   </h3>
   <div class="leafygreen-ui-9mycqc">
    <p class="leafygreen-ui-1kp3ins">
     The following page refers to the aggregation stage
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-pipeline-pipe.-unset" target="_self">
      <span>
       <code class="leafygreen-ui-1l06pbn">
        $unset
       </code>
      </span>
     </a>
     . For the update operator
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/operator/update/unset/#mongodb-update-up.-unset">
      <code class="leafygreen-ui-1l06pbn">
       $unset
      </code>
     </a>
     , see
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/operator/update/unset/#mongodb-update-up.-unset">
      <code class="leafygreen-ui-1l06pbn">
       $unset
      </code>
      .
     </a>
    </p>
   </div>
  </div>
  <dl class="pipeline">
   <dt>
    <code class="leafygreen-ui-1l06pbn">
     $unset
    </code>
    <a class="headerlink leafygreen-ui-1kepx47" href="#mongodb-pipeline-pipe.-unset" title="Permalink to this definition">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="mongodb-pipeline-pipe.-unset">
     </div>
    </a>
   </dt>
   <dd>
    <p class="leafygreen-ui-1kp3ins">
     Removes/excludes fields from documents.
    </p>
   </dd>
  </dl>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Syntax
   <a class="headerlink leafygreen-ui-1kepx47" href="#syntax" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="syntax">
    </div>
   </a>
  </h2>
  <p class="leafygreen-ui-1kp3ins">
   The
   <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-pipeline-pipe.-unset" target="_self">
    <span>
     <code class="leafygreen-ui-1l06pbn">
      $unset
     </code>
    </span>
   </a>
   stage has the following syntax:
  </p>
  <ul class="leafygreen-ui-rioki0">
   <li class="leafygreen-ui-d7p7b6">
    <p class="leafygreen-ui-1kp3ins">
     To remove a single field, the
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-pipeline-pipe.-unset" target="_self">
      <span>
       <code class="leafygreen-ui-1l06pbn">
        $unset
       </code>
      </span>
     </a>
     takes a string that
specifies the field to remove:
    </p>
    <script class="structured_data" type="application/ld+json">
     {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"{ $unset: \"&lt;field&gt;\" }","programmingLanguage":"JavaScript"}
    </script>
    <div class="css-16lmvu9">
     <div class="leafygreen-ui-196mwvg">
      <div class="leafygreen-ui-yzcs8i">
       <pre class="leafygreen-ui-1q4bxgx" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-attr">$unset</span>: <span class="lg-highlight-string">"&lt;field&gt;"</span> }</td></tr></tbody></table></code></pre>
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           <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
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   </li>
   <li class="leafygreen-ui-d7p7b6">
    <p class="leafygreen-ui-1kp3ins">
     To remove multiple fields, the
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-pipeline-pipe.-unset" target="_self">
      <span>
       <code class="leafygreen-ui-1l06pbn">
        $unset
       </code>
      </span>
     </a>
     takes an array of
fields to remove.
    </p>
    <script class="structured_data" type="application/ld+json">
     {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"{ $unset: [ \"&lt;field1&gt;\", \"&lt;field2&gt;\", ... ] }","programmingLanguage":"JavaScript"}
    </script>
    <div class="css-16lmvu9">
     <div class="leafygreen-ui-196mwvg">
      <div class="leafygreen-ui-yzcs8i">
       <pre class="leafygreen-ui-1q4bxgx" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-attr">$unset</span>: <!-- -->[ <span class="lg-highlight-string">"&lt;field1&gt;"</span>, <span class="lg-highlight-string">"&lt;field2&gt;"</span>, <!-- -->...<!-- --> ] }</td></tr></tbody></table></code></pre>
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   </li>
  </ul>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Considerations
   <a class="headerlink leafygreen-ui-1kepx47" href="#considerations" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
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     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="considerations">
    </div>
   </a>
  </h2>
  <section>
   <h3 class="contains-headerlink leafygreen-ui-15ajumo" weight="medium">
    <code class="leafygreen-ui-1l06pbn">
     $unset
    </code>
    and
    <code class="leafygreen-ui-1l06pbn">
     $project
    </code>
    <a class="headerlink leafygreen-ui-1kepx47" href="#-unset-and--project" title="Permalink to this heading">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="-unset-and--project">
     </div>
    </a>
   </h3>
   <p class="leafygreen-ui-1kp3ins">
    The
    <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-pipeline-pipe.-unset" target="_self">
     <span>
      <code class="leafygreen-ui-1l06pbn">
       $unset
      </code>
     </span>
    </a>
    is an alias for the
    <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/operator/aggregation/project/#mongodb-pipeline-pipe.-project">
     <code class="leafygreen-ui-1l06pbn">
      $project
     </code>
    </a>
    stage that removes/excludes fields:
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"{ $project: { \"&lt;field1&gt;\": 0, \"&lt;field2&gt;\": 0, ... } }","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-yzcs8i">
      <pre class="leafygreen-ui-1q4bxgx" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-attr">$project</span>: <!-- -->{ <span class="lg-highlight-string">"&lt;field1&gt;"</span>: <span class="lg-highlight-number">0</span>, <span class="lg-highlight-string">"&lt;field2&gt;"</span>: <span class="lg-highlight-number">0</span>, <!-- -->...<!-- --> } }</td></tr></tbody></table></code></pre>
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       </button>
      </div>
     </div>
    </div>
   </div>
  </section>
  <section>
   <h3 class="contains-headerlink leafygreen-ui-15ajumo" weight="medium">
    Embedded Fields
    <a class="headerlink leafygreen-ui-1kepx47" href="#embedded-fields" title="Permalink to this heading">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="embedded-fields">
     </div>
    </a>
   </h3>
   <p class="leafygreen-ui-1kp3ins">
    To remove/exclude a field or fields within an embedded document, you
can use the
    <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-dot-notation">
     dot notation
    </a>
    , as in:
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"{ $unset: \"&lt;field.nestedfield&gt;\" }","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-yzcs8i">
      <pre class="leafygreen-ui-1q4bxgx" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-attr">$unset</span>: <span class="lg-highlight-string">"&lt;field.nestedfield&gt;"</span> }</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
   <p class="leafygreen-ui-1kp3ins">
    or
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"{ $unset: [ \"&lt;field1.nestedfield&gt;\", ...] }","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-yzcs8i">
      <pre class="leafygreen-ui-1q4bxgx" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-attr">$unset</span>: <!-- -->[ <span class="lg-highlight-string">"&lt;field1.nestedfield&gt;"</span>, <!-- -->...<!-- -->] }</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
  </section>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Examples
   <a class="headerlink leafygreen-ui-1kepx47" href="#examples" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="examples">
    </div>
   </a>
  </h2>
  <p class="leafygreen-ui-1kp3ins">
   Create a sample
   <code class="leafygreen-ui-1l06pbn">
    books
   </code>
   collection with the following documents:
  </p>
  <script class="structured_data" type="application/ld+json">
   {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.books.insertMany([\n   { \"_id\" : 1, title: \"Antelope Antics\", isbn: \"0001122223334\", author: { last:\"An\", first: \"Auntie\" }, copies: [ { warehouse: \"A\", qty: 5 }, { warehouse: \"B\", qty: 15 } ] },\n   { \"_id\" : 2, title: \"Bees Babble\", isbn: \"999999999333\", author: { last:\"Bumble\", first: \"Bee\" }, copies: [ { warehouse: \"A\", qty: 2 }, { warehouse: \"B\", qty: 5 } ] }\n])","programmingLanguage":"JavaScript"}
  </script>
  <div class="css-16lmvu9">
   <div class="leafygreen-ui-196mwvg">
    <div class="leafygreen-ui-1b1bvay">
     <pre class="leafygreen-ui-11itue3" tabindex="0"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-property">books</span>.<span class="lg-highlight-title lg-highlight-function">insertMany</span>(<!-- -->[</td></tr><tr class=""><td class="leafygreen-ui-7razhx">   <!-- -->{ <span class="lg-highlight-string">"_id"</span> <!-- -->: <span class="lg-highlight-number">1</span>, <span class="lg-highlight-attr">title</span>: <span class="lg-highlight-string">"Antelope Antics"</span>, <span class="lg-highlight-attr">isbn</span>: <span class="lg-highlight-string">"0001122223334"</span>, <span class="lg-highlight-attr">author</span>: <!-- -->{ <span class="lg-highlight-attr">last</span>:<span class="lg-highlight-string">"An"</span>, <span class="lg-highlight-attr">first</span>: <span class="lg-highlight-string">"Auntie"</span> }<!-- -->, <span class="lg-highlight-attr">copies</span>: <!-- -->[ <!-- -->{ <span class="lg-highlight-attr">warehouse</span>: <span class="lg-highlight-string">"A"</span>, <span class="lg-highlight-attr">qty</span>: <span class="lg-highlight-number">5</span> }<!-- -->, <!-- -->{ <span class="lg-highlight-attr">warehouse</span>: <span class="lg-highlight-string">"B"</span>, <span class="lg-highlight-attr">qty</span>: <span class="lg-highlight-number">15</span> } ] }<!-- -->,</td></tr><tr class=""><td class="leafygreen-ui-7razhx">   <!-- -->{ <span class="lg-highlight-string">"_id"</span> <!-- -->: <span class="lg-highlight-number">2</span>, <span class="lg-highlight-attr">title</span>: <span class="lg-highlight-string">"Bees Babble"</span>, <span class="lg-highlight-attr">isbn</span>: <span class="lg-highlight-string">"999999999333"</span>, <span class="lg-highlight-attr">author</span>: <!-- -->{ <span class="lg-highlight-attr">last</span>:<span class="lg-highlight-string">"Bumble"</span>, <span class="lg-highlight-attr">first</span>: <span class="lg-highlight-string">"Bee"</span> }<!-- -->, <span class="lg-highlight-attr">copies</span>: <!-- -->[ <!-- -->{ <span class="lg-highlight-attr">warehouse</span>: <span class="lg-highlight-string">"A"</span>, <span class="lg-highlight-attr">qty</span>: <span class="lg-highlight-number">2</span> }<!-- -->, <!-- -->{ <span class="lg-highlight-attr">warehouse</span>: <span class="lg-highlight-string">"B"</span>, <span class="lg-highlight-attr">qty</span>: <span class="lg-highlight-number">5</span> } ] }</td></tr><tr class=""><td class="leafygreen-ui-7razhx">])</td></tr></tbody></table></code></pre>
     <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
      <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
       <div class="leafygreen-ui-xhlipt">
        <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
         <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
         </path>
        </svg>
       </div>
      </button>
     </div>
    </div>
   </div>
  </div>
  <section>
   <h3 class="contains-headerlink leafygreen-ui-15ajumo" weight="medium">
    Remove a Single Field
    <a class="headerlink leafygreen-ui-1kepx47" href="#remove-a-single-field" title="Permalink to this heading">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="remove-a-single-field">
     </div>
    </a>
   </h3>
   <p class="leafygreen-ui-1kp3ins">
    The following example removes the top-level field
    <code class="leafygreen-ui-1l06pbn">
     copies
    </code>
    :
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.books.aggregate([ { $unset: \"copies\" } ])","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-yzcs8i">
      <pre class="leafygreen-ui-1q4bxgx" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-property">books</span>.<span class="lg-highlight-title lg-highlight-function">aggregate</span>(<!-- -->[ <!-- -->{ <span class="lg-highlight-attr">$unset</span>: <span class="lg-highlight-string">"copies"</span> } ])</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
   <p class="leafygreen-ui-1kp3ins">
    Alternatively, you can also use the following syntax:
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.books.aggregate([ { $unset: [ \"copies\" ] } ])","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-yzcs8i">
      <pre class="leafygreen-ui-1q4bxgx" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-property">books</span>.<span class="lg-highlight-title lg-highlight-function">aggregate</span>(<!-- -->[ <!-- -->{ <span class="lg-highlight-attr">$unset</span>: <!-- -->[ <span class="lg-highlight-string">"copies"</span> ] } ])</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
   <p class="leafygreen-ui-1kp3ins">
    Either operation returns the following documents:
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"{ \"_id\" : 1, \"title\" : \"Antelope Antics\", \"isbn\" : \"0001122223334\", \"author\" : { \"last\" : \"An\", \"first\" : \"Auntie\" } }\n{ \"_id\" : 2, \"title\" : \"Bees Babble\", \"isbn\" : \"999999999333\", \"author\" : { \"last\" : \"Bumble\", \"first\" : \"Bee\" } }","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-1b1bvay">
      <pre class="leafygreen-ui-11itue3" tabindex="0"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-string">"_id"</span> <!-- -->: <span class="lg-highlight-number">1</span>, <span class="lg-highlight-string">"title"</span> <!-- -->: <span class="lg-highlight-string">"Antelope Antics"</span>, <span class="lg-highlight-string">"isbn"</span> <!-- -->: <span class="lg-highlight-string">"0001122223334"</span>, <span class="lg-highlight-string">"author"</span> <!-- -->: <!-- -->{ <span class="lg-highlight-string">"last"</span> <!-- -->: <span class="lg-highlight-string">"An"</span>, <span class="lg-highlight-string">"first"</span> <!-- -->: <span class="lg-highlight-string">"Auntie"</span> } }</td></tr><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-string">"_id"</span> <!-- -->: <span class="lg-highlight-number">2</span>, <span class="lg-highlight-string">"title"</span> <!-- -->: <span class="lg-highlight-string">"Bees Babble"</span>, <span class="lg-highlight-string">"isbn"</span> <!-- -->: <span class="lg-highlight-string">"999999999333"</span>, <span class="lg-highlight-string">"author"</span> <!-- -->: <!-- -->{ <span class="lg-highlight-string">"last"</span> <!-- -->: <span class="lg-highlight-string">"Bumble"</span>, <span class="lg-highlight-string">"first"</span> <!-- -->: <span class="lg-highlight-string">"Bee"</span> } }</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
  </section>
  <section>
   <h3 class="contains-headerlink leafygreen-ui-15ajumo" weight="medium">
    Remove Top-Level Fields
    <a class="headerlink leafygreen-ui-1kepx47" href="#remove-top-level-fields" title="Permalink to this heading">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="remove-top-level-fields">
     </div>
    </a>
   </h3>
   <p class="leafygreen-ui-1kp3ins">
    The following example removes the top-level fields
    <code class="leafygreen-ui-1l06pbn">
     isbn
    </code>
    and
    <code class="leafygreen-ui-1l06pbn">
     copies
    </code>
    :
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.books.aggregate([\n   { $unset: [ \"isbn\", \"copies\" ] }\n])","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-yzcs8i">
      <pre class="leafygreen-ui-11itue3" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-property">books</span>.<span class="lg-highlight-title lg-highlight-function">aggregate</span>(<!-- -->[</td></tr><tr class=""><td class="leafygreen-ui-7razhx">   <!-- -->{ <span class="lg-highlight-attr">$unset</span>: <!-- -->[ <span class="lg-highlight-string">"isbn"</span>, <span class="lg-highlight-string">"copies"</span> ] }</td></tr><tr class=""><td class="leafygreen-ui-7razhx">])</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
   <p class="leafygreen-ui-1kp3ins">
    The
    <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-pipeline-pipe.-unset" target="_self">
     <span>
      <code class="leafygreen-ui-1l06pbn">
       $unset
      </code>
     </span>
    </a>
    operation outputs the following documents:
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"{ \"_id\" : 1, \"title\" : \"Antelope Antics\", \"author\" : { \"last\" : \"An\", \"first\" : \"Auntie\" } }\n{ \"_id\" : 2, \"title\" : \"Bees Babble\", \"author\" : { \"last\" : \"Bumble\", \"first\" : \"Bee\" } }","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-1b1bvay">
      <pre class="leafygreen-ui-11itue3" tabindex="0"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-string">"_id"</span> <!-- -->: <span class="lg-highlight-number">1</span>, <span class="lg-highlight-string">"title"</span> <!-- -->: <span class="lg-highlight-string">"Antelope Antics"</span>, <span class="lg-highlight-string">"author"</span> <!-- -->: <!-- -->{ <span class="lg-highlight-string">"last"</span> <!-- -->: <span class="lg-highlight-string">"An"</span>, <span class="lg-highlight-string">"first"</span> <!-- -->: <span class="lg-highlight-string">"Auntie"</span> } }</td></tr><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-string">"_id"</span> <!-- -->: <span class="lg-highlight-number">2</span>, <span class="lg-highlight-string">"title"</span> <!-- -->: <span class="lg-highlight-string">"Bees Babble"</span>, <span class="lg-highlight-string">"author"</span> <!-- -->: <!-- -->{ <span class="lg-highlight-string">"last"</span> <!-- -->: <span class="lg-highlight-string">"Bumble"</span>, <span class="lg-highlight-string">"first"</span> <!-- -->: <span class="lg-highlight-string">"Bee"</span> } }</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
  </section>
  <section>
   <h3 class="contains-headerlink leafygreen-ui-15ajumo" weight="medium">
    Remove Embedded Fields
    <a class="headerlink leafygreen-ui-1kepx47" href="#remove-embedded-fields" title="Permalink to this heading">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="remove-embedded-fields">
     </div>
    </a>
   </h3>
   <p class="leafygreen-ui-1kp3ins">
    The following example removes the top-level field
    <code class="leafygreen-ui-1l06pbn">
     isbn
    </code>
    , the
embedded field
    <code class="leafygreen-ui-1l06pbn">
     first
    </code>
    (from the
    <code class="leafygreen-ui-1l06pbn">
     name
    </code>
    document) and the embedded field
    <code class="leafygreen-ui-1l06pbn">
     warehouse
    </code>
    (from the elements in the
    <code class="leafygreen-ui-1l06pbn">
     copies
    </code>
    array):
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.books.aggregate([\n   { $unset: [ \"isbn\", \"author.first\", \"copies.warehouse\" ] }\n])","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-1b1bvay">
      <pre class="leafygreen-ui-11itue3" tabindex="0"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-property">books</span>.<span class="lg-highlight-title lg-highlight-function">aggregate</span>(<!-- -->[</td></tr><tr class=""><td class="leafygreen-ui-7razhx">   <!-- -->{ <span class="lg-highlight-attr">$unset</span>: <!-- -->[ <span class="lg-highlight-string">"isbn"</span>, <span class="lg-highlight-string">"author.first"</span>, <span class="lg-highlight-string">"copies.warehouse"</span> ] }</td></tr><tr class=""><td class="leafygreen-ui-7razhx">])</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
   <p class="leafygreen-ui-1kp3ins">
    The
    <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-pipeline-pipe.-unset" target="_self">
     <span>
      <code class="leafygreen-ui-1l06pbn">
       $unset
      </code>
     </span>
    </a>
    operation outputs the following documents:
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"{ \"_id\" : 1, \"title\" : \"Antelope Antics\", \"author\" : { \"last\" : \"An\" }, \"copies\" : [ { \"qty\" : 5 }, { \"qty\" : 15 } ] }\n{ \"_id\" : 2, \"title\" : \"Bees Babble\", \"author\" : { \"last\" : \"Bumble\" }, \"copies\" : [ { \"qty\" : 2 }, { \"qty\" : 5 } ] }","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-1b1bvay">
      <pre class="leafygreen-ui-11itue3" tabindex="0"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-string">"_id"</span> <!-- -->: <span class="lg-highlight-number">1</span>, <span class="lg-highlight-string">"title"</span> <!-- -->: <span class="lg-highlight-string">"Antelope Antics"</span>, <span class="lg-highlight-string">"author"</span> <!-- -->: <!-- -->{ <span class="lg-highlight-string">"last"</span> <!-- -->: <span class="lg-highlight-string">"An"</span> }<!-- -->, <span class="lg-highlight-string">"copies"</span> <!-- -->: <!-- -->[ <!-- -->{ <span class="lg-highlight-string">"qty"</span> <!-- -->: <span class="lg-highlight-number">5</span> }<!-- -->, <!-- -->{ <span class="lg-highlight-string">"qty"</span> <!-- -->: <span class="lg-highlight-number">15</span> } ] }</td></tr><tr class=""><td class="leafygreen-ui-7razhx">{ <span class="lg-highlight-string">"_id"</span> <!-- -->: <span class="lg-highlight-number">2</span>, <span class="lg-highlight-string">"title"</span> <!-- -->: <span class="lg-highlight-string">"Bees Babble"</span>, <span class="lg-highlight-string">"author"</span> <!-- -->: <!-- -->{ <span class="lg-highlight-string">"last"</span> <!-- -->: <span class="lg-highlight-string">"Bumble"</span> }<!-- -->, <span class="lg-highlight-string">"copies"</span> <!-- -->: <!-- -->[ <!-- -->{ <span class="lg-highlight-string">"qty"</span> <!-- -->: <span class="lg-highlight-number">2</span> }<!-- -->, <!-- -->{ <span class="lg-highlight-string">"qty"</span> <!-- -->: <span class="lg-highlight-number">5</span> } ] }</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
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