object-no-new-keys

Check, does a plain object (AST/JSON) has any unique keys, not present in a reference object (another AST/JSON)

Install

This package is pure ESM. If you're not ready yet, install an older version of this program, 3.1.0 (npm i object-no-new-keys@3.1.0).

npm i object-no-new-keys

Quick Take

import { strict as assert } from "assert";

import { noNewKeys } from "object-no-new-keys";

assert.deepEqual(
  noNewKeys(
    {
      a: {
        b: "b",
        c: "c",
      },
      x: "y",
    },
    {
      a: {
        c: "z",
      },
    },
  ),
  ["a.b", "x"],
);

Documentation

Please visit codsen.com for a full description of the API.

Contributing

To report bugs or request features or assistance, raise an issue on GitHub.

Licence

MIT License

Copyright 2010-2025 Roy Revelt and other contributors