demo-middleware-2.js

app.delete("/:restaurantId", [onlyLoggedInUsers, restaurantOwnerOnlyMiddleware], (req, res) => {
    // an user which doesn't fulfill the preconditions from the middlewares above, will not reach the code below
    // do your delete operation here
    res.send();
});

// you can simple re-use the implementation above
app.put("/:restaurantId", [onlyLoggedInUsers, restaurantOwnerOnlyMiddleware], (req, res) => {
    // do your put operation here
    res.send();
});