Route parameters are named URL segments that are used to capture the values specified at their position in the URL
The captured values are populated in the req.params object, with the name of the route parameter specified in the path as their respective keys
Route parameters are similar to function parameters
Given the following route handler:
app.get('/users/:userId/books/:bookId', function (req, res) {
res.send(req.params)
})
If the client makes a request to the following url: GET http://localhost:3000/users/34/books/8989
Then inside our route handle req.params will contain the following object: { "userId": "34", "bookId": "8989" }