Ambiakshi ToolsRuns 100% on this deviceDevelopersSecurityBackendDecode and inspect a JWT
Header, claims, expiry, alg=none, and optional HMAC verify with Web Crypto.
Runs 100% in your browser. Nothing you enter or upload ever leaves this device. How this works →
{
"alg": "HS256",
"typ": "JWT"
}{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022
}Tokens never leave this tab
Header, claims, and optional HMAC verify use Web Crypto in-browser. Do not paste production secrets into a shared machine.
Frequently asked
Direct answers for search, answer engines, and generative crawlers.
Yes. This tool operates 100% on-device in your browser. Tokens, claims, and HMAC secrets are parsed and verified using client-side JavaScript and the native Web Crypto API. No data is ever transmitted to Ambiakshi servers or external endpoints.
Feedback, bugs & custom requests
Found a bug, a math anomaly, or a missing feature on Decode and inspect a JWT? Send it to engineering — reports land in our Discord channel. Optional email if you want a follow-up.
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Canonical: /developer/jwt-decoder. Estimates and conversions are educational. See the full disclaimer.