CODEWITHSUNDEEP
node.jsexpressurl-routing
millarnui
millarnui

Reputation: 549

Express.js - How can I pass a url param from the main router to another router module?

In my small chat application, when I make a HTTP call to an endpoint ending in "users" I want my room router to take over. This be with a preceding room name, or with nothing at all.

routes.js:

module.exports = function(app) {
    var roomRoute = require('./routes/room');
    app.use('/:roomname/users', roomRoute);
    app.use('/users', roomRoute);
};

Now when my room router takes over, I want to be able to access the room name if it exists in the url. Something like:

./routes/room.js:

var express = require('express');
var router = express.Router();

router.get('/info', function(req, res) {
    console.log('the roomname is ' + req.roomname);
    res.end();
});

module.exports = router;

Is there any way to easily pass this room name along? I could probably extract it from the baseUrl but I think there is probably a better way...

Upvotes: 2

Views: 1603

Answers (2)

TheProgrammer
TheProgrammer

Reputation: 824

The router needs to set the mergeParams option to true. http://expressjs.com/en/4x/api.html#express.router

let router = express.Router({ mergeParams: true });

Upvotes: 4

millarnui
millarnui

Reputation: 549

The very next thing I read after I posted had the answer...

In routes.js:

var roomRoute = require('./routes/room');
app.use('/:roomname/users', function (req, res, next) {
    req.roomname = req.params.roomname;
    next();
}, roomRoute);
app.use('/users', roomRoute);

Upvotes: 2

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