Express routes parameter conditions

Question

I have a route on my Express app that looks like this:

app.get('/:id', function (request, response) {
  …
});

The ID will always be a number. However, at the moment this route is matching other things, such as /login.

I think I want two things from this:

to only use this route if the ID is a number, and
only if there isn't a route for that specific paramater already defined (such as the clash with /login).

Can this be done?

app.get(/^(\d+)$/, function (request, response) {
  var id = request.params[0];
  ...
});

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danmactough · Accepted Answer · 4/12/2013 2:31:11 PM

Expanding on Marius's answer, you can provide the regex AND the parameter name:

app.get('/:id(\\d+)/', function (req, res){
  // req.params.id is now defined here for you
});

danmactough