Use HTTP headers in Express

Access HTTP header value from request

You can use to access all HTTP headersRequest.headersproperty:

app.get('/', (req, res) => {
  console.log(req.headers)
})

useRequest.header()Ways to access a single request header value:

app.get('/', (req, res) => {
  req.header('User-Agent')
})

Change any HTTP header value of the response

You can change any HTTP header value usingResponse.set():

res.set('Content-Type', 'text/html')

However, there is a shortcut for the Content-Type header:

res.type('.html')
// => 'text/html'

res.type('html')
// => 'text/html'

res.type('json')
// => 'application/json'

res.type('application/json')
// => 'application/json'

res.type('png')
// => image/png:

More crash tutorials:

• Express, the popular Node.js framework
• Use Express to retrieve GET query string parameters
• Use express-validator to validate input in Express
• Express template
• Use Express to serve static assets
• Send JSON response using Express
• Fast meeting
• Send a reply using Express
• Send files using Express
• Use Express-Validator to clean up the input in Express
• Route in Express
• Express HTTPS server with self-signed certificate
• Express, request parameters
• Use Express to retrieve POST query parameters
• Use Express to handle redirects
• Fast middleware
• Set up let's encrypt for Express
• Use HTTP headers in Express
• Processing forms in Express
• Use Express to process file uploads in forms
• Processing CORS in Express
• Use Express to manage cookies