Load a JSON string into a data structure.
Also, create a new data structure and serialize it into JSON.

Use objects and arrays (as appropriate for your language)
and make sure your JSON is valid (https://jsonformatter.org).

var json = require('JSON').new;
var data = json.decode('{"blue": [1, 2], "ocean": "water"}');
say data;
data{:ocean} = Hash.new(water => %w[fishy salty]);
say json.encode(data);