gistfile1.js

var userMgrAPI = express.Router();
// A set of API to manage users (/apis/admin/user/:username)
userMgrAPI.route('user/:username')
  .get(function(req, res) {
      // Getting user information
  })
  .post(function(req, res) {
      // Create a new user
  })
  .delete(function(req, res) {
      // Delete specific user
  })
  .put(function(req, res) {
      // Update
  });

app.use('/apis/admin', userMgrAPI);