Decode JSON Web Tokens (JWT) payload, header, and signature securely in your browser.
How to Use JWT Decoder
Paste a full JWT (three dot-separated parts) into the input box.
The tool automatically splits and decodes the header and payload sections into readable JSON.
Review the decoded claims - expiry (`exp`), issuer, and any custom fields - directly in the output panes.
Key Features & Practical Use Cases
Decoding web tokens securely in your browser to verify authentication claims and payload claims.
Inspecting encryption algorithms or signature header metadata without uploading tokens.
Debugging user access permissions and token lifespan limits during code builds.
Frequently Asked Questions
Does this verify the token's signature?
No - it only decodes the header and payload (which are just Base64URL-encoded, not encrypted); it does not check the signature against a secret or public key.
Is my token sent anywhere?
No - decoding happens entirely in your browser using standard Base64URL decoding, so the token never leaves your device.
Can I decode an expired token?
Yes - it will still show you the decoded payload including the `exp` timestamp, so you can confirm exactly when (or if) it expired.
About OneClickly
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