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deepGet javascript Code Snippet in 2024

objectintermediate

Last Updated: 15 May 2024

Gets the target value in a nested JSON object, based on the keys array.

  • Compare the keys you want in the nested JSON object as an Array.
  • Use Array.prototype.reduce() to get the values in the nested JSON object one by one.
  • If the key exists in the object, return the target value, otherwise return null.
const deepGet = (obj, keys) => keys.reduce( (xs, x) => (xs && xs[x] !== null && xs[x] !== undefined ? xs[x] : null), obj );
let index = 2; const data = { foo: { foz: [1, 2, 3], bar: { baz: ['a', 'b', 'c'] } } }; deepGet(data, ['foo', 'foz', index]); // get 3 deepGet(data, ['foo', 'bar', 'baz', 8, 'foz']); // null

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