JWT Decoder — Decode & Inspect JSON Web Tokens Free Online
DeveloperDecode any JWT token instantly. View the header, payload, signature and expiry status. Free online JWT decoder — all decoding happens in your browser, nothing sent to servers.
About the JWT Decoder — Decode & Inspect JSON Web Tokens Free Online
Our free JWT decoder instantly decodes any JSON Web Token and displays the decoded header, payload and signature in a readable, formatted view. See the algorithm, token type, subject, issued-at timestamp, expiry date and current expiry status (valid or expired). Copy header or payload JSON with one click. All decoding is client-side — your token is never sent to any server.
How to Use the JWT Decoder — Decode & Inspect JSON Web Tokens Free Online
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Paste your JWT token (format: xxxxx.yyyyy.zzzzz) into the input box.
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Click Decode JWT.
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View the decoded Header and Payload.
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Check the expiry status — green for valid, red for expired.
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Copy the header or payload JSON.
Frequently Asked Questions
What is a JWT?
A JSON Web Token is a compact, URL-safe token used for authentication. It has three Base64URL-encoded parts: Header (algorithm), Payload (claims) and Signature.
Does this verify the JWT signature?
No. Signature verification requires the secret/public key used to sign the token. This tool only decodes the header and payload to make them readable.
Is it safe to paste my JWT here?
Our tool decodes entirely client-side — nothing is transmitted. Be cautious with production tokens that contain sensitive data.
What does the expiry status mean?
The exp claim is a Unix timestamp for when the token expires. We compare it to the current time and show green (valid) or red (expired).