Creating Custom Middleware | Noroff Front-end Development

Now let’s create our own middleware function that measures how long each request takes:

// Request timing middleware
app.use((req, res, next) => {
  const start = Date.now();

  res.on("finish", () => {
    const duration = Date.now() - start;
    console.log(`${req.method} ${req.url} - ${duration}ms`);
  });

  next();
});

How it works:

const start = Date.now() - Records the current time when the request starts
res.on('finish', ...) - Sets up an event listener that waits for the response to complete
When the response finishes, the callback function runs and calculates the duration
Date.now() - start - Calculates how many milliseconds have passed
The result is logged to the console showing the request method, URL, and duration

This gives you timing information for every request.

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