Why are route parameters needed in url requests?

Question

Express.js

Smoking docs for Node.js and Express.js, currently reading "route parameters". The topic, in general, is clear, how and what to do. But I can't really understand why. I understand what is needed - otherwise they would not have come up with it, but I would like to know for what specific purposes in modern real development they are used? Thanks in advance!

Answer 1

app.get("/products/:productId", function (request, response) {
  response.send("productId: " + request.params["productId"])
});

This single handler will work for all product info request URLs.

/products/1
/products/2
/products/3
И так далее...

The variable request.params["productId"]will contain the product ID, by which you can get information from the database.