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Skip to contentDecode and inspect JSON Web Tokens in your browser. Header, payload and signature — no upload.
Full tool — runs in your browser. No sign-up required.
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Debug auth flows by pasting a JWT and reading header and payload JSON with syntax highlighting. Tentaco decodes locally — tokens are not sent to a validation API unless you explicitly use verify features that fetch keys.
Inspect exp, iss, aud and custom claims during OAuth integrations. Pair with the hash generator and JSON formatter in Developer Studio.
Never paste production tokens in chat or on untrusted sites; close the tab after debugging on shared PCs.
Open JWT Decoder.
Paste the JWT string.
Review decoded header and payload.
Optional: verify signature if keys are available.
Tokens stay in your session; treat decoded payloads as sensitive if they contain PII.
LocalThis tool processes data locally in your browser. Tentaco does not receive your file contents for this mode.
Decode runs locally; verify may fetch public keys only when enabled.
Do not paste live user tokens on shared PCs; processing is local but screen/history may leak.
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JWT Debugger — decode tokens
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