express js params

JavaScript
app.get('/path/:name', function(req, res) {
  res.send("tagId is set to " + req.params.name);
});app.get('/path/:name', function(req, res) { // url: /path/test
  console.log(req.params.name);  // result: test
});

// OR

app.get('/path', function(req, res) {  // url: /path?name='test'
  console.log(req.query['name']);  // result: test
});app.get('/users/:userId/books/:bookId', function (req, res) {
  res.send(req.params)
})
Route path: /users/:userId/books/:bookId
Request URL: http://localhost:3000/users/34/books/8989
req.params: { "userId": "34", "bookId": "8989" }
Source

Also in JavaScript: