How do you parse incoming JSON data in Express?
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In Express.js, parsing incoming JSON data from client requests is done using the built-in middleware express.json(), introduced in Express 4.16+. It reads the request body and parses it into a JavaScript object, making it accessible via req.body.
How to Use:
const express = require('express');
const app = express();
app.use(express.json()); // Middleware to parse JSON
Example:
app.post('/data', (req, res) => {
console.log(req.body); // Parsed JSON data
res.send('Data received');
});
Sample Request (from Postman or client):
{
"name": "Alice",
"age": 25
}
Output:
{ name: 'Alice', age: 25 }
Notes:
Without express.json(), req.body will be undefined for JSON data.
For parsing form data, use express.urlencoded({ extended: true }).
Older Versions of Express:
Before 4.16, you had to use body-parser:
const bodyParser = require('body-parser');
app.use(bodyParser.json());
Summary:
To handle incoming JSON in Express, simply use express.json() middleware. It ensures that any JSON sent in the request body is automatically parsed and made available through req.body.
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