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Is fast-json-stable-stringify ESM-only? Can you require() it?

deterministic `JSON.stringify()` - a faster version of substack's json-stable-strigify without jsonify

Last verified Sep 9, 2026 against fast-json-stable-stringify@2.1.0. JSON

CommonJS CommonJS — require() works on every Node.js version

fast-json-stable-stringify ships CommonJS only. require("fast-json-stable-stringify") works everywhere. import "fast-json-stable-stringify" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Latest
2.1.0 (Dec 14, 2019)
Module format
CommonJS
Last CommonJS version
2.1.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
137.5M
License
MIT

Does fast-json-stable-stringify@2.1.0 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("fast-json-stable-stringify") from a CommonJS file and import "fast-json-stable-stringify" from an ES module.

Runtimerequire("fast-json-stable-stringify")import "fast-json-stable-stringify"
Node.js 18✓ works✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4✓ works✓ works

How to import fast-json-stable-stringify

ES modules (import)

import fastJsonStableStringify from "fast-json-stable-stringify";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const fastJsonStableStringify = require("fast-json-stable-stringify");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (3 versions; the newest 3 shown).

VersionsFormatFirst published
1.0.2 – 2.1.0CommonJSOct 24, 2017

Frequently asked

Is fast-json-stable-stringify ESM-only?

fast-json-stable-stringify@2.1.0 is a CommonJS package. fast-json-stable-stringify ships CommonJS only. require("fast-json-stable-stringify") works everywhere. import "fast-json-stable-stringify" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import fast-json-stable-stringify with ES module syntax?

Yes. import fastJsonStableStringify from "fast-json-stable-stringify" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does fast-json-stable-stringify work in Bun?

Yes. import "fast-json-stable-stringify" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does fast-json-stable-stringify ship TypeScript types?

Yes. fast-json-stable-stringify bundles its own type declarations; no @types package is needed.

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