Build Your Web Framework From Scratch!

Yusuke's talk at JS Nation was titled 'Build Your Web Framework from Scratch'.

Yusuke is a developer advocate at Cloudflare and the creator of the web framework Hono.

Middleware functions execute before and after the main handler in the web framework, allowing modifications to requests and responses, and reuse across routes.

A 'handler' is a function that processes incoming requests and returns a response. It can be customized with headers and status codes.

Developers can test their applications by creating requests and passing them to the app's fetch method, checking the response object's status and body without needing to run a server on localhost.

The 'context' is an object that includes request data, match results, and can be extended to hold custom values, facilitating communication between middleware and handlers.

According to Yusuke, a web framework simplifies the development process by handling routing, parameters, different response types, authentication, cross-origin requests, and security features, making code more readable and maintainable.

The web framework handles routing by defining routes with methods, paths, and handlers. It uses URL patterns to match requests and execute the appropriate handler.

The web framework discussed in Yusuke's talk is built using JavaScript and TypeScript.

Helpers are reusable functions that provide useful logic, such as rendering HTML. They receive context and can be accessed using 'C.helper' inside handlers.