Express routes of parameter parameters

Question

I have a route in my Express application that looks like this:

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

The identifier will always be a number. However, this route currently matches other things, such as /login .

I think I need two things:

• use this route only if the identifier is a number, and
• only if there is no longer a route for this particular parameter (for example, a collision with /login ).

Can this be done?

Answer 1

By expanding Marius's answer, you can specify the regular expression AND the parameter name:

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

Answer 2

Yes, see http://expressjs.com/guide/routing.html and https://www.npmjs.com/package/path-to-regexp (which expresses usage). Unverified version that may work:

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

Answer 3

You can use:

 // /12345 app.get(/\/([^\/]+)\/?/, function(req, res){ var id = req.params[0]; // do something }); 

or that:

 // /post/12345 app.get(/\/post\/([^\/]+)\/?/, function(req, res){ var id = req.params[0]; // do something });