JWT Decoder / Debugger

Inspect JWT header and payload, view claims, and check exp/iat — decode only, no verify.

100% client-side — your data never leaves this device.

JWT

Decoder only — signature is not verified. Never paste production secrets into untrusted sites; this tool runs locally in your browser.

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022,
  "exp": 1916239022
}

SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Time claims: exp: 9/21/2030, 4:37:02 PM. iat: 1/18/2018, 1:30:22 AM.

Paste a token to inspect Base64URL-decoded header and payload. Signature is not verified — never paste secrets you do not trust.