Send a JSON response using Express

Sep 1, 2018

Learn how to send a JSON response in Express using the Response.json() method, which takes an object or array and converts it to JSON before sending it.

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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.

Example:

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 (if you want to inspect or validate the JSON your API returns, try my JSON formatter):

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

Tagged: Express.js · All topics

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