how to modify laravel middleware to work with firebase authentication

I am working in laravel and firebase as a backend for authentication and data storage. I am using firebase provided js code to signin the user

firebase.auth().signInWithEmailAndPassword(email, password).catch(function(error) {
  // Handle Errors here.
  var errorCode = error.code;
  var errorMessage = error.message;
  // ...
});

The problem is that I want to protect my routes from non-authenticated users. How would I check this in my middleware that user is logged in or not because js stores current user's uid in localStorage. Do I have to use a separate database for this purpose? Please help me to go in right direction.

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