Laravel javascript logout

What is the best practice, if something wrong happens, in a client-side (of a laravel 5.4 project) in a JavaScript code, for example the code is not able to find the important cookies?

So how can I make a code what is automatically log-out the user (with an error message) if some error occours? Is there any simple library or method, what should I use in this case?

Thanks for the answers and suggestions in advance!

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