function findPackageJSON | Node.js module module

specifier: string | URL,

base?: string | URL

): undefined | string;

/path/to/project
  ├ packages/
    ├ bar/
      ├ bar.js
      └ package.json // name = '@foo/bar'
    └ qux/
      ├ node_modules/
        └ some-package/
          └ package.json // name = 'some-package'
      ├ qux.js
      └ package.json // name = '@foo/qux'
  ├ main.js
  └ package.json // name = '@foo'

// /path/to/project/packages/bar/bar.js
import { findPackageJSON } from 'node:module';

findPackageJSON('..', import.meta.url);
// '/path/to/project/package.json'
// Same result when passing an absolute specifier instead:
findPackageJSON(new URL('../', import.meta.url));
findPackageJSON(import.meta.resolve('../'));

findPackageJSON('some-package', import.meta.url);
// '/path/to/project/packages/bar/node_modules/some-package/package.json'
// When passing an absolute specifier, you might get a different result if the
// resolved module is inside a subfolder that has nested `package.json`.
findPackageJSON(import.meta.resolve('some-package'));
// '/path/to/project/packages/bar/node_modules/some-package/some-subfolder/package.json'

findPackageJSON('@foo/qux', import.meta.url);
// '/path/to/project/packages/qux/package.json'

@param specifier

The specifier for the module whose package.json to retrieve. When passing a bare specifier, the package.json at the root of the package is returned. When passing a relative specifier or an absolute specifier, the closest parent package.json is returned.

@param base

The absolute location (file: URL string or FS path) of the containing module. For CJS, use __filename (not __dirname!); for ESM, use import.meta.url. You do not need to pass it if specifier is an absolute specifier.

@returns

A path if the package.json is found. When startLocation is a package, the package's root package.json; when a relative or unresolved, the closest package.json to the startLocation.

module.default.findPackageJSON