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req.headers

An object of the incoming request HTTP headers.

Since Express 4 Spec ↗

Syntax

req.headers

Returns

object — Header names (lowercased) mapped to values.

Examples

app.get('/ua', (req, res) => {
  res.send(req.headers['user-agent']);
});
Output 
$ curl localhost:3000/ua
curl/8.4.0

app.get('/auth', (req, res) => {
  const token = req.headers.authorization?.split(' ')[1];
  res.json({ hasToken: Boolean(token) });
});
Output 
{"hasToken":true}

Notes

Header keys are always lowercased. Prefer `req.get('Header-Name')` for case-insensitive single-header access. Do not trust client-supplied headers like `X-Forwarded-For` unless `trust proxy` is configured for your known proxy.

See also