Express makes use of HTTP verbs and path patterns to provide a meaningful API for describing routes:

app.verb(path, [callback...], callback)

The route handlers take the same arguments (request, response, and next), and the path can be a string (that will be transformed into a regular expression) or a regular expression.

If we were to define a route handler to update an article, then the request method (verb) would be PUT, and the URL could look like /articles/211 (where the number represents the article ID). Here's how to do this with Express:

app.put('/articles/:id', function(req, res, next) {
  var id = req.params.id;

  console.log('Updating article ' + id);
  console.log('Attributes: ', req.body);
  // save to database
  // send message or render template
});