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Is ajv-formats ESM-only? Can you require() it?

Format validation for Ajv v7+

Last verified Sep 9, 2026 against ajv-formats@3.0.1. Markdown · JSON

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

ajv-formats ships CommonJS only. require("ajv-formats") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "ajv-formats" 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.

What to do

  1. require("ajv-formats") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import ajvFormats from "ajv-formats"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
3.0.1 (Mar 30, 2024)
Module format
CommonJS
Last CommonJS version
3.0.1
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
116.4M
License
MIT

Does ajv-formats@3.0.1 actually load? Runtime test results

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

Runtimerequire("ajv-formats")import "ajv-formats"
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 ajv-formats

ES modules (import)

import ajvFormats from "ajv-formats";

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 ajvFormats = require("ajv-formats");

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 (31 versions; the newest 31 shown).

VersionsFormatFirst published
0.0.1 – 3.0.1CommonJSJul 20, 2020

Frequently asked

Is ajv-formats ESM-only?

ajv-formats@3.0.1 is a CommonJS package. ajv-formats ships CommonJS only. require("ajv-formats") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "ajv-formats" 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 ajv-formats with ES module syntax?

Yes. import ajvFormats from "ajv-formats" 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 ajv-formats work in Bun?

Yes. import "ajv-formats" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does ajv-formats ship TypeScript types?

Yes. ajv-formats bundles its own type declarations; no @types package is needed.

Links

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