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JWT Decoder

Decode and analyze JWT with expiry checks and HS signature verification.

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About This Tool

Designed for development and debugging, this tool offers complete JWT decoding and visualization. Paste a token to inspect structured header and payload data, including alg, typ, iss, sub, aud, iat, nbf, and exp. It shows validity status in real time and allows local verification for HS256/HS384/HS512 by entering a secret. Everything runs client-side with no uploads.

Features

  • 🔍 Instant Decode: Automatically parses Base64URL header and payload
  • 📊 Claims Display: Friendly view of iss, sub, aud, iat, nbf, exp
  • ⏱️ Status: Real-time expiry and not-before indicators
  • 🛡️ Local Verify: HS256/HS384/HS512 signature verification
  • 📋 Easy Controls: Sample, paste, one-click copy and clear
  • 🔒 Privacy First: 100% client-side processing

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