developer tools
JWT Decoder
Inspect JSON Web Token (JWT) structures, decode claims, check token expiration dates, and debug authentication flows securely.
Parsed purely client-side. Your auth tokens are never logged or stored.
Header: Algorithm & Token Type
...
Payload: Claims & Data
...
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How to Use JWT Decoder
1
Paste JWT
Paste your encoded token (three dot-separated base64 segments).
2
Inspect Parts
View the decoded Header, Payload claims, and Signature information.
3
Check Expiry
Verify whether the token is currently active or expired.
About JWT Decoder
Splits the input token by the period (`.`) delimiter, decodes the base64url-encoded header and payload objects, and formats JSON properties.
Supported Formats
JWT
Operational Limits
- •Does not sign new tokens or verify secret keys client-side to prevent exposing private keys
Key Features
- Color-coded Header, Payload, and Signature breakdown
- Human-readable Unix timestamp conversion for `exp`, `iat`, and `nbf`
- Expiry countdown and active status badge
- Zero network exposure of sensitive authentication tokens
Frequently Asked Questions
Yes, the decoder runs 100% inside your client browser and does not make any network requests.
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