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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. JSON

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

ajv-formats ships CommonJS only. require("ajv-formats") works everywhere. 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.

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✓ 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 (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 everywhere. 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 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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