No 3rd party dependencies. All dependencies, checked recursively, are Codsen packages.

Features

Transform and inspect nested arrays and objects with two traversal contracts and higher-level helpers.

• Use traverse and DELETE from ast-monkey/traverse to transform a cloned tree, replace values, or remove entries.
• Use traverseWithLookahead from ast-monkey/lookahead to observe visits and preview upcoming nodes. Its callback return is ignored, and callback values can reference the original input.
• Import all APIs, including find, get, set, drop, del, and arrayFirstOnly, from ast-monkey.
• The traversal subpaths load smaller JavaScript entry points. They share the package installation and its dependencies.
• Direct browser scripts keep dist/ast-monkey.umd.js and the astMonkey global, including both traversal APIs.

Install

This package is pure ESM. If you're not ready yet, install an older version of this program, 7.15.0 (npm i [email protected]).

npm i ast-monkey

Quick Take

import { strict as assert } from "node:assert";

import { find } from "ast-monkey";

assert.deepEqual(
  find(
    {
      a1: {
        b1: "c1",
      },
      a2: {
        b2: "c2",
      },
      z1: {
        x1: "y1",
      },
    },
    { key: "a*" },
  ),
  [
    {
      index: 1,
      key: "a1",
      val: {
        b1: "c1",
      },
      path: [1],
    },
    {
      index: 3,
      key: "a2",
      val: {
        b2: "c2",
      },
      path: [3],
    },
  ],
);

Documentation

Please visit codsen.com for a full description of the API. For Changelog, see raw md on GitHub or the website.

Contributing

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

Licence

MIT License

Copyright © 2010-2026 Roy Revelt and other contributors