Summary  
This chapter explains how to parse JSON data sent in HTTP requests in an Express application by enabling the express.json() middleware and accessing the data through req.body.

General domain of usage  
Backend web development


When a client sends data to the server, it is usually included in the request body.

To read this data in Express, you need to enable JSON parsing using middleware:

```javascript id="3v8k2p"
app.use(express.json());
```

After that, you can access incoming data using `req.body`.

```javascript id="m2z7qx"
app.post('/users', (req, res) => {
  const user = req.body;

  res.json(user);
});
```

If a client sends:

```json
{ "name": "John", "age": 25 }
```

You can access it like this:

* Name: `req.body.name`;
* Age: `req.body.age`.

This is commonly used when creating or updating data in backend 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.

Receiving Data from Client