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koa2-connect
Advanced tools
Base on koa-connect, improve to support webpack-dev-middleware and webpack-hot-middleware. Use Express/Connect middleware with Koa.
It is highly recommended to use a Koa-specific middleware instead of trying to convert an Express version when they're available. There is a non-trivial difference in the Koa and Express designs and you will inevitably run into some issues. This module is a workaround for the specific cases where the differences can be ignored. Additionally, it also enables library authors to write 1 version of their HTTP middleware.
next
Express middlewares need to declare and invoke the next
callback appropriately for the koa-connect integration to work correctly.
If you're attempting to write a framework-agnostic middleware library, be sure to use only core HTTP methods and not any Express-dependent APIs like res.send
.
npm install koa2-connect
See examples/
for more real-world examples.
const Koa = require('koa')
const c2k = require('koa2-connect')
// A generic Express-style middleware function
function connectMiddlware (req, res, next) {
res.writeHead(200, {'Content-Type': 'text/plain'})
res.end('From the Connect middleware')
next()
}
// A generic Koa v2 middlware, without async/await
function koaMiddlware(ctx, next) {
return next()
.then(() => {
// The control flow will bubble back to here, like usual
})
.catch((err) => {
// Error handling from downstream middleware, like usual
})
}
// A generic Koa v2 middlware with async/await
async function koaMiddleware(ctx, next) {
try {
await next();
} catch (e) {
// Normal error handling
}
// Normal control flow
}
const app = new Koa()
app.use(koaMiddlware)
app.use(c2k(connectMiddlware))
app.use((ctx, next) => {
console.log('It will continue on to here')
})
app.listen(3000)
Tests are in tests.js
and are made with the Mocha framework. You can run them with npm test
or npm run test:watch
MIT
FAQs
Use Connect/Express middleware in Koa2
We found that koa2-connect demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
Did you know?
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