Sending JSON Responses

In backend development, data is usually sent in JSON format.

JSON is a structured way to represent data. It looks like a JavaScript object but is used for communication between systems.

In Express, you can send JSON using res.json():

app.get('/user', (req, res) => {
  res.json({
    name: 'John',
    age: 25
  });
});

This sends a structured response that can be easily used by the frontend.

JSON is commonly used because it is simple, readable, and supported by all modern applications.