Intercept / Log anything you write to your express response from anywhere from any file. Just add the following code to your `app.js`.

intercepting http response.js

app.use((request, response, next) => {
  // wheather `req.write` / `req.send` / `req.json`, express calls underlying `socket.write`
  // thus intercepting `socket.write`
  const backup = response.socket.write;
  
  let code;
  
  function newWriter(...args) {
    for (const arg of args) {
      if (typeof arg === 'string') {
        if (arg.startsWith('HTTP')) { // this means express is writing the HTTP headers
          const header = arg.substring(0, arg.indexOf('\n'));
          [, code] = header.split(' ');
          code = Number.parseInt(code, 10);
        }
      } else if (arg instanceof Buffer) { // this means something is being written by you
        const message = `Responding ${code} | ${arg}`;
        if (code < 400) {
          console.info(message);
        } else if (code < 500) {
          console.warn(message);
        } else {
          console.error(message);
        }
      }
    }

    // this line is IMPORTANT. call the actual `socket.write` as well.
    return backup.apply(this, args);
  }
  response.socket.write = newWriter;

  next();
});