How to handle JWT in Ruby

Ruby developers working with JSON Web Tokens (JWTs) benefit from the jwt gem, a dominant library that aligns with Ruby idioms and leverages OpenSSL, which is included in every Ruby installation. The jwt gem supports major signing algorithms such as HMAC, RSA, and ECDSA, and provides features like JWK and JWKS support for key management. JWTs, widely used for securely transmitting information between systems, consist of a header, payload, and signature. The guide details how to safely handle, verify, and work with JWTs in Ruby, covering key concepts like HS256 and RS256 verification, Rails integration patterns, and key rotation strategies. It emphasizes best practices like always verifying the token signature, enforcing expected algorithms, validating critical claims like expiration and audience, and using JWKS endpoints to handle key rotation and verification efficiently. The guide also highlights the importance of short-lived access tokens, centralized JWT logic, and secure storage of secrets using Rails credentials, while cautioning against common pitfalls such as algorithm confusion attacks. The document suggests using WorkOS for comprehensive authentication solutions, especially for enterprise scenarios, as it offers a modern API for integrating SSO, managing users, and issuing secure tokens without the need for a complete in-house authentication stack.

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