External
jwt.io
Decode and verify JSON Web Tokens in one paste.
jwt.io decodes a JWT into its header and payload, verifies signatures, and doubles as a directory of JWT libraries per language. Decoding happens client-side in your browser, and the site is free.
Best for: Use this when you need to inspect what is inside a JWT and check which library to use.
Pros
- Instant decode with signature verification
- Client-side decoding in the browser
- Library directory for every major language
Cons
- Pasting production tokens into any website is a habit worth resisting
- Focused on JWTs only, not a general auth debugger
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