req.headers.auth is undefined In jwt and express js

I’m new to use jwt library ..

So I made a login form and if it success it generates token and verify but it generates token and respond that token , but I can’t get that token in req.headers.authorization , i tried req.headers[‘authorization’] also , it shows undefined and I console logs req.headers it gives like host , connection , origin , accept , referrer , cookie …i try to add Authorization with token in my routes like this req.headers.authorization = token , it stores but can’t get it …

verify token.js

import { user } from './models/users.js'; 
export const verifyToken = async (req, res, next) => {
  const authHeader = req.headers['authorization'];
  
  if (!authHeader) {
    return res.status(401).send('Token is missing');
  }

  const token = authHeader.split('   ')[1];
  if (!token)
    return res.status(401).send('Token is missing');
  }

  try {
    jwt.verify(token, process.env.SECRET_KEY, async (err, decoded) => {
      if (err) {
        console.log('Token verification error:', err);
        return res.status(403).send('Invalid token');
      }
      const user1 = await user.findOne({ id: decoded.id });
      if (!user1) {
        return res.status(404).send('User not found');
      }

      req.user = user1;
      next();
    });
  } catch (e) {
    console.log('Error in verifyToken middleware:', e);
    return res.status(500).send('Server error');
  }
};

GenerateToken.js

export const generateToken = (user) => {
  try {
    return jwt.sign({ id: user.id }, process.env.SECRET_KEY, { expiresIn: '30m' });
  } catch (e) {
    console.log('Error generating token:', e);
  }
};

const router = express.Router();
routes.get('/' ,  startpage)
router.post('/register', register);
router.post('/login', login);
router.get('/home', verifyToken, homepage);
router.get('/buynow', verifyToken, buynow);

Here , / -> Startpage has two forms

Login form , register form

Loginform -> post method and /login action

Registerform -> post method and /register action

I use generateToken function on /login and it gives token./home -> will renders a home ejs file

I use generateToken () function in /login route

Like : let token= generateToken(userVar)

Token is generated correctly

It gives the token and but I can’t verify it , it responds missing token , but it can’t get req.headers.authorization and it displays undefined