How do Express and Koa compare for building web applications?

What are the main differences between Express and Koa for web development?

Express is a minimal and flexible Node.js web application framework, while Koa is designed to be a smaller, more expressive, and more robust foundation for web applications.

Which one is better for performance?

Koa generally has better performance due to its lightweight nature and the use of async/await, which allows for more efficient handling of requests.

What about middleware support?

Express has a larger ecosystem of middleware available, while Koa's middleware is more modern and uses promises, making it easier to work with.

Can you give examples of when to use each?

Use Express for quick setups and when you need a lot of middleware options. Use Koa for new projects where you want better performance and modern features.