Approach to intercept responses in Express

• Middleware is used to override res.send() and res.json().
• The overridden functions log the response body and then call the original functions.
• Middleware is registered in the order it should be executed.
• Route handlers trigger the intercepted functions when sending responses.

Syntax:

// Custom middleware to intercept all requests
app.use((req, res, next) => {
  // Modify the response body or perform any other actions
  console.log(`Intercepted request: ${req.method} ${req.url}`);
  next(); 
});

In the context of Express , “intercept” usually refers to the process of capturing or modifying a request or response in a middleware function before it reaches its final destination (e.g., a route handler) or before it is sent back to the client.

In Express, intercepting response.send() or response.json() can be achieved by using middleware functions. Middleware functions in Express have access to the request, response, and the next middleware function in the application’s request-response cycle. We can use this feature to intercept and modify the response before it is sent to the client.