Simple JWT auth middleware function

authorizeme.js

// Firebase token auth middleware function to protect routes
function authorizeMe(req, res, next) {
  let idToken;
  // Grab token from POST header
  if (
    req.headers.authorization &&
    req.headers.authorization.startsWith('Bearer ')
  ) {
    idToken = req.headers.authorization.split('Bearer ')[1];
    // Firebase function to verify token
    admin
      .auth()
      .verifyIdToken(idToken)
      .then(decoded => decoded)
      .then(() => next())
      .catch(err => {
        console.error(err.message);
        res.status(403).send('Unauthorized');
      });
  } else {
    res.status(403).send('Not Allowed');
  }
}