Better JWT Decoder

About

Better JWT Decoder is a focused JWT inspection tool for developers.

  Paste a JWT into the popup to decode the header and payload instantly. Review claims in a clean split layout, copy values with hover actions, inspect Unix epoch claims with UTC, local browser time, and relative time, and optionally
  verify signatures using shared secrets or public keys.

  Features:
  • Decode JWT header and payload locally
  • Colorized encoded JWT segments
  • Claim value copy actions
  • Epoch claim breakdown for exp, iat, and nbf
  • Optional signature verification for HMAC, RSA, PSS, and ECDSA JWTs
  • Optional DevTools panel to capture JWTs from network requests
  • Dark theme
  • PRO account status via Chrome profile email sign-in

  Privacy note:
  JWT decoding happens locally in the extension popup. Pasted JWTs are not sent to our backend. Email is only used when the user signs in to check PRO subscription status.

  Single purpose:

  Decode and inspect JWTs locally, with optional signature verification and optional DevTools-based JWT capture from network requests.