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Authentication, Tokens, and Session Security

Authentication is the foundation of every secure web application. In React, handling tokens and sessions correctly is non-negotiable: misplacing a JWT in localStorage, ignoring CSRF, or forgetting refresh-token rotation opens your users to account takeover, stolen credentials, and session hijacking. This series guides you from token basics through advanced session patterns, with production-ready code and security-first decisions built in.

Over 73% of web security breaches involve credential compromise, according to the OWASP 2023 Top 10. React developers often inherit token-handling decisions from tutorials that are outdated or insecure. You will learn why httpOnly cookies beat localStorage, how refresh tokens prevent single-point-of-failure exposure, how OAuth 2.0 eliminates password burden, and how to architect React components that enforce authorization silently.

By the end of this series, you will understand:

  • JWT structure, claims, and validation flow
  • Why localStorage leaks tokens to XSS and why httpOnly cookies are the correct choice
  • Server-side session patterns that work with React SPAs
  • Refresh-token rotation to cap exposure window
  • Silent renewal to keep sessions alive without user friction
  • Protected routes that block unauthorized access
  • OAuth 2.0 provider integration (Google, GitHub, etc.)
  • Secure logout and token revocation
  • CORS and CSRF defense in token-based auth

Each article is standalone; you can read them in order or jump to a topic.

Articles in this series​