Summary  
This chapter covers how to send structured JSON responses from an Express server using the `res.json()` method.  

General domain of usage  
Web API development


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()`:

```javascript id="3kq9vm"
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.


Learn how to build backend servers and APIs using Express.js. Create routes, handle requests and responses, and work with real data flows. Gain practical skills needed to start building real backend applications.

Sending JSON Responses