Token-Based Authentication: Bearer Tokens Explained
How token-based auth replaces sessions: token issuance, transmission, validation, and revocation in single-page and mobile apps.
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Tags: security, authentication, tokens
Token-Based Authentication: JWT, Opaque Tokens, and PASETO Token-based authentication replaced server-side sessions as the dominant pattern for APIs and SPAs. Instead of looking up a session in a database on every request, the client holds a token that carries its own proof of validity. But not all tokens are equal — choosing the wrong format or trusting the wrong fields creates security vulnerabilities that are subtle and hard to detect. What Is a Token? A token is a credential issued after successful authentication. The client stores it and presents it on every subsequent request, typically in the header: The server validates the token and decides whether to honor the request. The difference between token formats lies in where and how validation happens. JWT: Stateless Self-Contained…
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