Question 1

How do I implement JWT authentication in a Rust web server with jsonwebtoken?

Accepted Answer

Use the encode function to create tokens with your claims struct, and decode with Validation for verification. Integrate with frameworks like Actix-web by adding middleware to extract and validate tokens from HTTP headers.

Question 2

jsonwebtoken vs jwt-crate: which is better for Rust?

Accepted Answer

jsonwebtoken offers more algorithm support, type safety, and backend flexibility, while jwt-crate might be simpler for basic use. Choose jsonwebtoken if you need JWK integration or custom crypto providers.

Question 3

How to validate custom claims like user roles in jsonwebtoken?

Accepted Answer

Define your claims struct with Serde fields for roles, and use the Validation struct to set required claims. After decoding, you can add additional logic to check role values manually.

Question 4

What's the best way to handle token expiration with clock skew in jsonwebtoken?

Accepted Answer

Set the leeway field in the Validation struct to a few seconds, allowing tolerance for exp and nbf claims. This compensates for minor time differences between servers.

Question 5

Can I decode JWT tokens from third-party providers using JWK with jsonwebtoken?

Accepted Answer

Yes, use DecodingKey::from_rsa_components with the n and e values from the JWK JSON, as demonstrated in the README for RSA-based tokens from external sources.

Question 6

How to choose between aws_lc_rs and rust_crypto backends?

Accepted Answer

aws_lc_rs is based on AWS's LC library and may offer better performance on some platforms, while rust_crypto is a pure Rust implementation. Consider your deployment environment and compatibility requirements.

jsonwebtoken

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