Get route definition in middleware

Question

Does anyone know if it's possible to get the path used to trigger the route?

For example, let's say I have this:

app.get('/user/:id', function(req, res) {});

With the following simple middleware being used

function(req, res, next) {
     req.?
});

I'd want to be able to get /user/:id within the middleware, this is not req.url.

Answer 1

What you want is req.route.path.

For example:

app.get('/user/:id?', function(req, res){
  console.log(req.route);
});

// outputs something like

{ path: '/user/:id?',
  method: 'get',
  callbacks: [ [Function] ],
  keys: [ { name: 'id', optional: true } ],
  regexp: /^\/user(?:\/([^\/]+?))?\/?$/i,
  params: [ id: '12' ] }

http://expressjs.com/api.html#req.route

---

EDIT:

As explained in the comments, getting req.route in a middleware is difficult/hacky. The router middleware is the one that populates the req.route object, and it probably is in a lower level than the middleware you're developing.

This way, getting req.route is only possible if you hook into the router middleware to parse the req for you before it's executed by Express itself.

Answer 2

FWIW, two other options:

// this will only be called *after* the request has been handled
app.use(function(req, res, next) {
  res.on('finish', function() {
    console.log('R', req.route);
  });
  next();
});

// use the middleware on specific requests only
var middleware = function(req, res, next) {
  console.log('R', req.route);
  next();
};
app.get('/user/:id?', middleware, function(req, res) { ... });