Koa vs Express Middleware: Which is Better?

What are the main differences between Koa and Express middleware?

Koa and Express are both web frameworks for Node.js, but Koa is more modern and lightweight. Koa uses async/await for middleware, while Express relies on callbacks. This makes Koa more efficient and easier to read.

Can you give me an example of middleware in both Koa and Express?

Sure! In Express, middleware is added using app.use(), like this: app.use((req, res, next) => { console.log('Request received'); next(); }); In Koa, you would use app.use(async (ctx, next) => { console.log('Request received'); await next(); });.

Which one should I choose for a new project?

It depends on your needs. If you prefer a minimalistic approach and want to use modern JavaScript features, Koa might be the better choice. If you need a more established framework with a larger ecosystem, Express is a solid option.

Are there any performance differences between them?

Yes, Koa is generally considered to have better performance due to its lightweight nature and the use of async/await, which reduces overhead. However, the actual performance can vary based on the specific use case.