> ## Documentation Index
> Fetch the complete documentation index at: https://docs.codemod.com/llms.txt
> Use this file to discover all available pages before exploring further.
# MSW v1 to v2 Migration
MSW v2 brings the biggest API change to the library since its inception. Alongside the new API, it includes various features, such as `ReadableStream` support, ESM-compatibility, and countless bug fixes.
Codemod supports a mostly automated MSW v2 upgrade experience. This page provides tips and resources you may need for a successful migration.
## Getting started
}
href="https://mswjs.io/docs/migrations/1.x-to-2.x/#codemods"
/>
## Migration Steps
```bash theme={null}
npm install msw@latest
```
Inside your project's root directory, run the [MSW v2 upgrade recipe](https://go.codemod.com/msw-codemods):
```bash theme={null}
npx codemod @mswjs/v2
```
The upgrade recipe does not change the signatures of MSW handlers, if they were called using a custom factory function, for example to provide more type-safety or else. For example, the following code will only be partially updated:
```Typescript theme={null}
export function mockFactory(
export function mockFactory(
url: string,
resolver: MyResolverType,
) {
return rest.get(url, resolver);
}
const handlers = [
mockFactory('/some/url', (req, res, ctx) => {
return res(ctx.status(200));
}),
];
```
Additionally, if you were using `req.body` in your interceptors, this codemod will blindly assume you want `await request.json()` instead of any other type. You will have to correct that manually.