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

> ajv-keywords@5.1.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Additional JSON-Schema keywords for Ajv JSON validator

Last verified Sep 9, 2026 against ajv-keywords@5.1.0.

ajv-keywords ships CommonJS only. require("ajv-keywords") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "ajv-keywords" 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-keywords") 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 ajvKeywords from "ajv-keywords"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 5.1.0 (Nov 21, 2021)
- Module format: CommonJS
- Last CommonJS version: 5.1.0
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 61.4M
- License: MIT

## Runtime test results for ajv-keywords@5.1.0

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

| Runtime | require("ajv-keywords") | import "ajv-keywords" |
|---|---|---|
| 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-keywords

ES modules:

```js
import ajvKeywords from "ajv-keywords";
```

CommonJS:

```js
const ajvKeywords = require("ajv-keywords");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (29 versions; the newest 29 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 5.1.0 | CommonJS | Jun 5, 2016 |

## Frequently asked

**Is ajv-keywords ESM-only?**

ajv-keywords@5.1.0 is a CommonJS package. ajv-keywords ships CommonJS only. require("ajv-keywords") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "ajv-keywords" 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-keywords with ES module syntax?**

Yes. import ajvKeywords from "ajv-keywords" 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-keywords work in Bun?**

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

**Does ajv-keywords ship TypeScript types?**

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

## Links

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

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