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In this video, we implement a simple authentication system in Next.js using the App Router. You will learn the difference between authentication and authorization, create a login API, store login state using cookies, and protect a dashboard route. We also implement a redirect mechanism for unauthenticated users. Finally, we discuss common interview questions related to authentication in modern web applications. Topics covered in this video: --Understand authentication in web applications --Authentication vs authorization explained --Create a simple login API in Next.js --Store login state using cookies --Protect a route (dashboard) --Redirect unauthenticated users --Common authentication interview questions This tutorial is perfect for beginners, students, freshers, and developers learning how to implement authentication in Next.js applications. š¢ Subscribe & Turn On Notifications to follow this NextJS Course Day-by-Day! š¢ *Resources:* š *NextJS Documentation* - https://nextjs.org/learn/react-foundations š *GitHub Code Link* - https://github.com/mohitdjcet/nextJS-Tutorial š *Playlist Links:* - DSA Full Tutorial: https://www.youtube.com/playlist?list=PLsjpRo2EZP1LKQePmuWv8jppLddppmGkn - React 19 Full Course : https://youtu.be/cHIn7PUAxlg - NodeJS Full Course: https://youtu.be/pdk60AyhMNM - JavaScript Full Course: https://youtu.be/moRFcW7xayc -GitHub Copilot Full Course:https://youtu.be/hebwERejgI4 - HTML Crash Course : https://youtu.be/Zb_-6SttO3M - CSS Crash Course : https://youtu.be/b7PlBCjAJco š *Follow Me for Updates:* - TopMate:[Connect with Me](https://topmate.io/mohitdecodes) - WhatsApp:[Connect with Me](https://whatsapp.com/channel/0029Vb6CABUIHphQqGRYP71u) - Instagram: [Connect with Me](https://www.instagram.com/mohit_decodes/) - Facebook: [Connect with Me](https://www.facebook.com/mohitdecode/) - LinkedIn: [Connect with Me](https://www.linkedin.com/in/mohitdecodes/) - GitHub: [Explore My Projects](https://github.com/mohitdjcet/) nextjs authentication tutorial, nextjs login api example, authentication vs authorization explained, nextjs protected routes tutorial, cookie based authentication nextjs, nextjs app router authentication demo, nextjs auth interview questions, nextjs for beginners 2026, mohit decodes nextjs #nextjs #authentication #authorization #websecurity #nextjs2026 #webdevelopment #frontenddevelopment #javascript #learnnextjs #mohitdecodes --- Copyright Notice: Ā© Mohit Decodes. All rights reserved. Unauthorized reproduction or distribution of this content is prohibited. For permissions, contact via LinkedIn or email.