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jwt.io

Decode and verify JSON Web Tokens in one paste.

Tool·Developer·Free

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About jwt.io

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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JWT DecoderDecode a JSON Web Token to inspect its header and payload claims instantly in your browser. Shows expiry in human-readable time.JWT Generator (HS256)Build and sign a JSON Web Token from your payload and a secret using HS256 via the Web Crypto API. Pairs with the JWT decoder. Runs privately.Base64 Encode / DecodeConvert text to Base64 and decode Base64 back to text instantly in your browser. UTF-8 safe.

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