How to send a command for the database from the client to the server?

Question

Node.js

Hello everyone, tell me how to send commands from the client to the server for execution?
For example, create a collection

MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  var dbo = db.db("mydb");
  dbo.createCollection("customers", function(err, res) {
    if (err) throw err;
    console.log("Collection created!");
    db.close();
  });
});

Answer 1

1) You make some kind of route on the backend that will accept requests to a specific address.
2) Through this route, you process the request, get what you need from the database, ... and return the answer with the data
3) On the client, you just need to throw an ajax request to the address of the route
Or did I misunderstand the question?