How to Use JWTs for Authorization: Best Practices and Common Mistakes

JSON Web Tokens (JWTs) are widely used in application security for authentication, acting as compact, self-contained tokens that carry identity-related information between parties. While they efficiently verify user identity by including stable claims like user ID or email, using JWTs for authorization can lead to significant issues. JWTs are static and unable to accommodate dynamic or fine-grained access control, as they cannot reflect real-time changes or context-sensitive data. Overloading JWTs with roles and permissions can cause bloated tokens and security vulnerabilities. Instead, JWTs should serve as identity carriers, with the actual authorization decisions being handled by a separate access control system, such as OAuth 2.0 or policy engines like OPA. This approach allows for more flexible, maintainable, and secure authorization workflows, focusing JWTs on identity verification while leaving complex access decisions to dedicated systems.

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