What is the purpose of the Express 4 namespace parameter?

Question

What is the purpose of the Express 4 namespace parameter?

Having worked extensively with Express 4, I recently attempted to implement a namespaced route with a parameter. This would involve routes like:

/:username/shows
/:username/shows/:showname/episodes

I figured this scenario was ideal for express namespacing, so I set it up as follows:

Router = require("express").Router;
userRouter = Router();

userRouter.route("/shows").get(function(req,res){ ... });
app.use("/:param", userRouter);

The page loaded correctly at /:username/shows, but when checking the req.params object, I noticed that the key for username was empty. Would appreciate any insights on where I can access these parameters?

javascript node.js express

Answer 1

Answer №1

When working with your code, keep in mind that the :username parameter is utilized by the app and not within the userRouter. The only way to access it is through the app, or you have the option to pass along the :username parameter information to the userRouter using the app.params() function.

app.param('username', function(req, res, next, username) {
  req.username = req.params.username;
  next();
});

app.use('/:username', userRouter);

userRouter.get('/show', function(req, res, next){
  var username = req.username; // Here you can access;
  res.send("DONE");
});

Answer 2

When working with your code, keep in mind that the :username parameter is utilized by the app and not within the userRouter. The only way to access it is through the app, or you have the option to pass along the :username parameter information to the userRouter using the app.params() function.

app.param('username', function(req, res, next, username) {
  req.username = req.params.username;
  next();
});

app.use('/:username', userRouter);

userRouter.get('/show', function(req, res, next){
  var username = req.username; // Here you can access;
  res.send("DONE");
});

What is the purpose of the Express 4 namespace parameter?

Answer №1

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