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@mswjs/http-middleware
Advanced tools
Spawn an [Express](https://expressjs.com) server from your [Mock Service Worker](https://github.com/mswjs/msw) request handlers or apply them to an existing server using a middleware.
@mswjs/http-middleware
Spawn an Express server from your Mock Service Worker request handlers or apply them to an existing server using a middleware.
You should always prefer Mock Service Worker for API mocking because it can meet most of your requirements without having to spawn and maintain an actual HTTP server. Please refer to the Getting started tutorial to integrate next-generation API mocking into your application.
There are, however, use cases when this extension can be applicable:
curl
your mock definitions locally;$ npm install @mswjs/http-middleware
// src/mocks/handlers.js
import { http, graphql, HttpResponse } from 'msw'
export const handlers = [
http.post('/user', () => {
return HttpResponse.json({ firstName: 'John' })
}),
graphql.query('GetUser', () => {
return HttpResponse.json({
data: {
user: {
firstName: 'John',
},
},
})
}),
]
Learn more about writing request handlers.
import { createServer } from '@mswjs/http-middleware'
import { handlers } from './handlers'
const httpServer = createServer(...handlers)
httpServer.listen(9090)
import { createMiddleware } from '@mswjs/http-middleware'
import app from './app'
import { handlers } from './handlers'
app.use(createMiddleware(...handlers))
createServer(...handlers: RequestHandler[])
Establishes a standalone Express server that uses the given request handlers to process all incoming requests.
import { http, HttpResponse } from 'msw'
import { createServer } from '@mswjs/http-middleware'
const httpServer = createServer(
http.get('/user', () => {
return HttpResponse.json({ firstName: 'John' })
}),
)
httpServer.listen(9090)
Making a GET http://localhost:9090/user
request returns the following response:
200 OK
Content-Type: application/json
{
"firstName": "John"
}
createMiddleware(...handlers: RequestHandler[])
Creates an Express middleware function that uses the given request handlers to process all incoming requests.
import { http, HttpResponse } from 'msw'
import { createMiddleware } from '@mswjs/http-middleware'
const app = express()
app.use(
createMiddleware(
http.get('/user', () => {
return HttpResponse.json({ firstName: 'John' })
}),
),
)
app.use(9090)
FAQs
Spawn an [Express](https://expressjs.com) server from your [Mock Service Worker](https://github.com/mswjs/msw) request handlers or apply them to an existing server using a middleware.
We found that @mswjs/http-middleware demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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