Routing is the process of determining what should happen when a URL is called, or also which parts of the application should handle a specific incoming request.

In the Hello World example we had:

app.get('/', (c) => { /* */ })

That maps GET / to the handler. You can also use app.post(), app.put(), and so on.

Named parameters

To use a value in the URL path (not the query string), use named parameters—for example, a route that takes a string and returns it uppercase:

app.get('/:test', c => {
  console.log(c.req.param('test'))
})

Example:

app.get('/uppercase/:val', (c) => {
  return c.text(c.req.param('val').toUpperCase())
})

If we send a request to /uppercase/test, we’ll get TEST in the body of the response.

You can use multiple named parameters in one URL; c.req.param() then returns an object with all of them.

Lessons in this unit:

0:	Introduction
1:	Your first Hono app
2:	The Request object
3:	Send a response to the client
4:	Manage cookies
5:	Work with HTTP headers
6:	Handling redirects
7:	▶︎ Routing
8:	JSX templates
9:	Middleware
10:	Hono on Node.js