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title: How to implement authentication in Next.js description: Learn how to implement authentication in your Next.js application. url: "https://nextjs.org/docs/app/guides/authentication" docs index: /docs/llms.txt version: 16.3.0 lastUpdated: 2026-08-07 prerequisites: - "Guides: /docs/app/guides" For an index of all Next.js documentation, see /docs/llms.txt. Understanding authentication is crucial for protecting your application's data. This page will guide you through what React and Next.js features to use to implement auth. Before starting, it helps to break down the process into three concepts: 1. Authentication : Verifies if the user is who they say they are. It requires the user to prove their identity with something they have, such as a username and password. 2.
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