How can the NodeJS Server send a response back to the JavaScript on the client side?

edit

The NodeJS server can send a response back to the JavaScript on the client side by using the res object in the callback function of the server's request handler.

For example, if the client sends a GET request to the server, the server can send a response using the res.send() method. The res.send() method sends a response message back to the client and closes the response stream.

Here's an example code snippet of sending a response back to the client:

app.get('/example', function(req, res) {
  res.send('Hello World!');
});

In this example, the server sends a response of 'Hello World!' to the client when a GET request is received at the '/example' route. When the client receives this response, it can then handle it in the client-side JavaScript code.