Can I edit tokens with this tool?
You can decode and view tokens. Modifying claims is possible, but changing claims invalidates the Signature. If you change a claim, the signature must be re-signed with the correct private/public key.
JWT Decoder
100% SecureDecode JSON Web Tokens (JWT) safely. Parse claims, issue timestamps, expiration metrics, and signature validation parameters offline.
encoded_token.jwt
decoded_payload.json
vpn_key
Decoded JSON structures will appear here once you paste a valid JWT token.
What is a JWT Decoder?
A JSON Web Token (JWT) decoder is a developer tool that splits a JWT token into its three distinct parts: the Header (defining algorithm and token type), the Payload (containing the user claims, permissions, and expiration times), and the Signature (used to verify token integrity). It decodes these Base64Url-encoded segments into readable JSON.
Debugging JWT Claims
Paste your encoded token (usually starting with 'eyJ...') into the input. The decoder instantly parses and color-codes the Header, Payload, and Signature. It displays claims clearly, shows token issue/expiration times converted to your local timezone, and includes a countdown showing how much time is left before expiration.
FAQ
Is my token sent to any server?
No. Parsing is done fully in your browser via local JavaScript. Your session tokens, signatures, and private keys never leave your machine.
Developer Toolkit CollectionThis utility is part of our browser-based suite. Explore the complete collection of local dev tools.
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