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

> yup@1.7.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Dead simple Object schema validation

Last verified Sep 9, 2026 against yup@1.7.1.

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

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

## What to do

1. require("yup") 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 yup from "yup"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 1.7.1 (Sep 21, 2025)
- Module format: CommonJS
- Last CommonJS version: 1.7.1
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 10.6M
- License: MIT

## Runtime test results for yup@1.7.1

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

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

ES modules:

```js
import yup from "yup";
```

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (119 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 0.22.0 – 1.7.1 | CommonJS | Aug 26, 2017 |

## Frequently asked

**Is yup ESM-only?**

yup@1.7.1 is a CommonJS package. yup ships CommonJS only. require("yup") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "yup" 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 yup with ES module syntax?**

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

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

**Does yup ship TypeScript types?**

Yes. yup bundles its own type declarations; no @types package is needed.

## Links

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

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