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Is flatted ESM-only? Can you require() it?

A super light and fast circular JSON parser.

Last verified Sep 9, 2026 against flatted@3.4.4. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

flatted publishes both a CommonJS entry and a native ESM entry (ESM added in 3.0.0). require("flatted") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "flatted" works alongside it.

What to do

  1. Nothing to change. require("flatted") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as flatted from "flatted" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
3.4.4 (Jul 30, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
3.4.4
Native ESM since
3.0.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
136.1M
License
ISC

Does flatted@3.4.4 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("flatted") from a CommonJS file and import "flatted" from an ES module.

Runtimerequire("flatted")import "flatted"
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 1.4.0✓ works✓ works

How to import flatted

ES modules (import)

import * as flatted from "flatted";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

const flatted = require("flatted");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (44 versions; the newest 44 shown).

VersionsFormatFirst published
3.0.0 – 3.4.4Dual (CommonJS + ESM)May 26, 2020
0.1.0 – 2.0.2CommonJSApr 26, 2018

Frequently asked

Is flatted ESM-only?

flatted@3.4.4 ships CommonJS and ESM builds. flatted publishes both a CommonJS entry and a native ESM entry (ESM added in 3.0.0). require("flatted") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "flatted" works alongside it.

Can I require flatted?

Yes. flatted ships a CommonJS entry alongside the native ESM entry. require("flatted") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

Does flatted work in Bun?

Yes. import "flatted" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does flatted ship TypeScript types?

Yes. flatted bundles its own type declarations; no @types package is needed.

Links

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