package com.intellij.json;

import com.intellij.lang.Language;

public class JsonLanguage extends Language {
  public static final JsonLanguage INSTANCE = new JsonLanguage();

  private JsonLanguage() {
    super("JSON", "application/json");
  }

  @Override
  public boolean isCaseSensitive() {
    return true;
  }
}

package com.intellij.json;

import com.intellij.lang.Language;

public class JsonLanguage extends Language {
  public static final JsonLanguage INSTANCE = new JsonLanguage();

  private JsonLanguage() {
    super("JSON", "application/json", "application/vnd.api+json");
  }

  @Override
  public boolean isCaseSensitive() {
    return true;
  }
}

add application/vnd.api+json as possible JSON mime type #WEB-17172 fixed