Skip to content

Send a response using Express

FULL-STACK WEB DEVELOPMENT BOOTCAMP

2024 COHORT SIGNUPS END TOMORROW

How to send a response back to the client using Express

In the Hello World example we used the Response.send() method to send a simple string as a response, and to close the connection:

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

If you pass in a string, it sets the Content-Type header to text/html.

if you pass in an object or an array, it sets the application/json Content-Type header, and parses that parameter into JSON.

send() automatically sets the Content-Length HTTP response header.

send() also automatically closes the connection.

Use end() to send an empty response

An alternative way to send the response, without any body, it’s by using the Response.end() method:

res.end()

Set the HTTP response status

Use the Response.status():

res.status(404).end()

or

res.status(404).send('File not found')

sendStatus() is a shortcut:

res.sendStatus(200)
// === res.status(200).send('OK')

res.sendStatus(403)
// === res.status(403).send('Forbidden')

res.sendStatus(404)
// === res.status(404).send('Not Found')

res.sendStatus(500)
// === res.status(500).send('Internal Server Error')
β†’ Get my Express.js Handbook
β†’ Read my Express.js Tutorial
  • Learn modern web development in my BOOTCAMP (SIGNUP END TOMORROW FEB 20, 2024)
  • THE VALLEY OF CODE (+ PRO), your web development manual
  • I wrote 15+ coding BOOKS, all available in THE VALLEY OF CODE PRO
  • Indie solopreneur internet business masterclass SOLO LAB (summer 2024)