Express: Send a JSON response

When you listen for connections on a route in Express, the callback function will be invoked on every network call with a Request object instance and a Response object instance.


app.get('/', (req, res) => res.send('Hello World!'))

Here we used the Response.send() method, which accepts any string.

You can send JSON to the client by using Response.json(), a useful method.

It accepts an object or array, and converts it to JSON before sending it:

res.json({ username: 'Flavio' })

Lessons this unit:

0: Introduction
1: Introduction to Express
2: Request parameters
3: Send a response to the client
4: ▶︎ Send a JSON response
5: Manage cookies
6: Work with HTTP headers
7: Handling redirects
8: Routing
9: Template engines
10: Middleware
11: Serving Static Assets with Express
12: Send files to the client
13: Sessions
14: Validating and sanitizing input
15: Handling form data