Express js 4x：req.params返回空对象

Question

Trying to get URl parameters in express js,but got empty object.

var password= require('./routes/password');
app.use('/reset/:token',password);

password.js

router.get('/', function(req, res, next) {
    console.log(req.params);
    res.send(req.params);
});

console.log(req.params) output is {}

Access url : http://localhost:3000/reset/CiVv6U9HUPlES3i0eUsNwK9zb7xVZpfHsQNuzMNWqLlGA4NJKoagwbcyiUZ8

Answer 1

By default, nested routers do not get passed any parameters that are used in mountpaths from their parent routers.

In your case, app is the parent router, which uses /reset/:token as a mountpath, and router is the nested router.

If you want router to be able to access req.params.token , create it as follows:

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

Documented here .

Answer 2

Instead you can use a middleware to log the path params:

const logger = (req, res, next)=>{
  console.log(req.params)
  res.send(req.params)
  next()//<----very important to call it.
};

app.use(logger); //<----use to apply in the app

router.get('/', (req, res, next)=>res.send('Logged.'));

Answer 3

Actually you messed it up a little bit. You have to pass instance of express to your module.

Server.js :

//adding modules
require('./routes/password')(app);

Password.js :

module.exports = function(router) {
    router.get('/reset/:token', function(req, res, next) {
        console.log(req.params);
        res.send(req.params);
    });

    //and so on.. your routes go here
}