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

> mockjs@1.1.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

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Last verified Sep 9, 2026 against mockjs@1.1.0.

mockjs ships CommonJS only. require("mockjs") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "mockjs" 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("mockjs") 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 mockjs from "mockjs"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/mockjs

## Facts

- Latest: 1.1.0 (Oct 25, 2019)
- Module format: CommonJS
- Last CommonJS version: 1.1.0
- TypeScript types: @types/mockjs
- Node engines: not declared
- Weekly downloads: 76K
- License: unknown

## Runtime test results for mockjs@1.1.0

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

| Runtime | require("mockjs") | import "mockjs" |
|---|---|---|
| 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 mockjs

ES modules:

```js
import mockjs from "mockjs";
```

CommonJS:

```js
const mockjs = require("mockjs");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (6 versions; the newest 6 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.1 – 1.1.0 | CommonJS | Sep 23, 2013 |

## Frequently asked

**Is mockjs ESM-only?**

mockjs@1.1.0 is a CommonJS package. mockjs ships CommonJS only. require("mockjs") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "mockjs" 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 mockjs with ES module syntax?**

Yes. import mockjs from "mockjs" 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 mockjs work in Bun?**

Yes. import "mockjs" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does mockjs ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/mockjs".

## Links

- [mockjs on npm](https://www.npmjs.com/package/mockjs)
- [Source repository](https://github.com/nuysoft/Mock)
- [HTML version](https://canirequire.com/package/mockjs/)
- [JSON version](https://canirequire.com/package/mockjs.json)

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