JWT Studio & Decoder

Decode, generate, and verify JSON Web Tokens securely. client-side, zero data leakage.

Encoded JWT
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Decoded Payload & Header
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Signature & Key Configuration

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Pure Client-Side Local Memory Processing · Zero Data Upload

Usage Guide

  • Paste a dot-separated, 3-part JWT string into the input area.
  • Inspect decoded JSON Header and Payload claims automatically.
  • Check expiration (exp) and issued-at (iat) fields, or verify signatures with keys.

Security & Privacy Guarantee

  • Decoding merely extracts Base64URL claims; it is NOT equivalent to cryptographic signature verification.
  • Unverified decoded payloads may have been tampered with; never rely on them for authorization decisions.
  • 3. Secure local browser parsing; analyzed sensitive tokens and API keys are not transmitted over the network.

Frequently Asked Questions

Q: Does viewing the payload mean the JWT is valid and verified?
A: No! Decoding only reveals Base64URL-encoded claims. Without HMAC/RSA signature verification, a token cannot be trusted.
Q: Is it safe to paste live production access tokens?
A: Yes, on MoxiKit. Decoding logic runs locally in your browser; token strings are never transmitted over the network.