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JWT Decoder

Decode any JSON Web Token in your browser. Pretty-prints header and payload, shows the signature, and checks whether the token is expired.

All processing happens locally in your browser. Files are never uploaded.

JWT token

Introduction

JWT Decoder parses a JSON Web Token and displays its header, payload and signature. The header and payload are Base64URL-decoded and pretty-printed as JSON, and the tool reads the exp claim to tell you whether the token has expired. It never sends your token anywhere; decoding happens locally.

Features

  • Decodes header and payload with Base64URL
  • Pretty-prints JSON claims
  • Shows the raw signature
  • Detects missing or malformed segments
  • Checks the exp expiration claim

How to use

  1. 1Paste your JWT (three dot-separated segments) into the input box.
  2. 2Click Decode.
  3. 3Read the pretty-printed header and payload.
  4. 4Check the green or red alert that tells you the expiration status.

Frequently asked questions

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