Send a JSON response using Express

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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:

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

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More express tutorials:

• Express, a popular Node.js Framework
• Retrieve the GET query string parameters using Express
• Validating input in Express using express-validator
• Express Templates
• Serving Static Assets with Express
• Send a JSON response using Express
• Express Sessions
• Send a response using Express
• Send files using Express
• Sanitizing input in Express using express-validator
• Routing in Express
• An Express HTTPS server with a self-signed certificate
• Express, Request Parameters
• Retrieve the POST query parameters using Express
• Handling redirects with Express
• Express Middleware
• Setup Let's Encrypt for Express
• Work with HTTP headers in Express
• Handling forms in Express
• Handling file uploads in forms using Express
• Handling CORS in Express
• Manage Cookies with Express