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JavaScript cookies and ensuring log in before accessing webpages

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I want a way to log in and store a users details (maybe in a cookie?) securely using JavaScript. The main I want to do is go from http://localhost:3000 to http://localhost:3000/welcome which I can do using the below code document.location.replace('./welcome'); However, if I currently type in http://localhost:3000/welcome address then it will take me straight there instead of asking for auth. how can I get a login page to be thrown in front of this page if no one is logged in? any good tutorials on this? thanks JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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You will need to do this server side. Other important thing to note is javascript it client side and not necessarily secure at all.

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