I have an express app like so:

// index.js
const express = require('express');
const app = express();
const userRoutes = require('./routes/userRoutes');

app.use('/user', userRoutes);

const verifyToken = (req, res, next) => {
    // validate req.cookies.token
    next();
}

And I'm using an express router module like this:

// routes/userRoutes.js
const express = require('express');
const router = express.Router();

router.get('/:userid/data', verifyToken, async (req, res) => {
    const data = await db.query()
    res.json(data)
   
});

Obviously this doesn't work because verifyToken is not accesible within the module. How can I use the same verifyToken middleware function throughout different express modules?