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

> ajv-formats@3.0.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Format validation for Ajv v7+

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

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.

## Facts

- 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

## Runtime test results for ajv-formats@3.0.1

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

| Runtime | require("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:

```js
import ajvFormats from "ajv-formats";
```

CommonJS:

```js
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).

| Versions | Format | First published |
|---|---|---|
| 0.0.1 – 3.0.1 | CommonJS | Jul 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

- [ajv-formats on npm](https://www.npmjs.com/package/ajv-formats)
- [Source repository](https://github.com/ajv-validator/ajv-formats)
- [HTML version](https://canirequire.com/package/ajv-formats/)
- [JSON version](https://canirequire.com/package/ajv-formats.json)

---

For scripts and AI agents: any package is at https://canirequire.com/package/<name>/index.md (Markdown) or https://canirequire.com/package/<name>.json (JSON); the site index is https://canirequire.com/llms.txt. Fetch the URL directly; no search needed.