Express router -: id?

Question

Real simple guys: I see that many book fragments / code fragments use the following syntax in the router:

app.use('/todos/:id', function (req, res, next) { console.log('Request Type:', req.method); next(); }); 

I'm not sure how to interpret the route here ... will it route '/ todos / anything'? and then grab anything, and the treatment with a variable identifier? how to use this variable? I am sure this is a quick answer, I just have not seen this syntax before.

Answer 1

This is a common middleware.

In this case, yes, it will send /todos/anything , and then req.params.id will be set to 'anything'

Answer 2

In your code intended for middleware Express Framework, if you want to get any identifier in the server code using this route, you will get this identifier using req.params.id .

 app.use('/todos/:id', function (req, res, next) { console.log('Request Id:', req.params.id); next(); }); 

Answer 3

Yes, in your example you will get req.params.id value of "nothing"

Answer 4

 Route path: /student/:studentID/books/:bookId Request URL: http://localhost:xxxx/student/34/books/2424 req.params: { "studentID": "34", "bookId": "2424" } app.get('/student/:studentID/books/:bookId', function (req, res) { res.send(req.params); }); 

Similarly for your code:

 Route path: /todos/:id Request URL: http://localhost:xxxx/todos/36 req.params: { "id": "36" } app.use('/todos/:id', function (req, res, next) { console.log('Request Id:', req.params.id); next(); });