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Is fast-xml-parser ESM-only? Can you require() it?

Validate XML, Parse XML, Build XML without C/C++ based libraries

Last verified Sep 9, 2026 against fast-xml-parser@5.11.1. Markdown · JSON

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

fast-xml-parser publishes both a CommonJS entry and a native ESM entry (ESM added in 5.0.0). require("fast-xml-parser") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "fast-xml-parser" works alongside it.

What to do

  1. Nothing to change. require("fast-xml-parser") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as fastXmlParser from "fast-xml-parser" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
5.11.1 (Aug 27, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
5.11.1
Native ESM since
5.0.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
57.8M
License
MIT

Does fast-xml-parser@5.11.1 actually load? Runtime test results

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

Runtimerequire("fast-xml-parser")import "fast-xml-parser"
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 fast-xml-parser

ES modules (import)

import * as fastXmlParser from "fast-xml-parser";

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

CommonJS (require)

const fastXmlParser = require("fast-xml-parser");

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 (192 versions; the newest 60 shown).

VersionsFormatFirst published
5.0.0 – 5.11.1Dual (CommonJS + ESM)Feb 19, 2025
4.5.5 – 4.5.7CommonJSMar 22, 2026

Frequently asked

Is fast-xml-parser ESM-only?

fast-xml-parser@5.11.1 ships CommonJS and ESM builds. fast-xml-parser publishes both a CommonJS entry and a native ESM entry (ESM added in 5.0.0). require("fast-xml-parser") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "fast-xml-parser" works alongside it.

Can I require fast-xml-parser?

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

Does fast-xml-parser work in Bun?

Yes. import "fast-xml-parser" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does fast-xml-parser ship TypeScript types?

Yes. fast-xml-parser bundles its own type declarations; no @types package is needed.

Links

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