Decode and inspect JWT tokens.
Decode JWT header and payload data, inspect standard claims and check token timing directly in your browser. Decoding does not verify the token signature.
Decode JWT header and payload data, inspect registered claims and review expiration or activation timing in a clean browser-based token inspector.
About This Tool
ToolsFaction JWT Decoder & Inspector helps developers read the contents of JSON Web Tokens without manually decoding Base64URL segments. Paste a JWT to view its header and payload as formatted JSON, inspect common registered claims and quickly see whether its time-based claims indicate an active, expired or not-yet-active token.nnThe inspector is intended for debugging and development. Decoding a JWT does not validate its cryptographic signature, issuer, audience or trustworthiness, so decoded content should not be treated as verified authentication data.
How to Use
- Paste a JWT into the Encoded JWT field.
- Select Decode Token to inspect the header, payload and standard claims.
- Review algorithm information, claim count and time-based token status.
- Copy the formatted header or payload when you need it for debugging.
Example
Paste a three-part JWT to inspect its alg value, payload fields and standard claims such as iss, sub, aud, iat, nbf and exp.
Frequently Asked Questions
Does this tool verify JWT signatures?
No. It decodes and inspects token contents only. Signature verification requires the correct cryptographic key and validation rules.
Can I check whether a JWT is expired?
Yes. When the payload contains a numeric exp claim, the inspector compares it with the current browser time and displays a time-based status.
What does Not Active mean?
When a numeric nbf claim is present and its time is still in the future, the inspector reports the token as Not Active.
Which JWT claims are shown?
The full payload is displayed, and common registered claims such as issuer, subject, audience, issued-at, not-before, expiration and JWT ID are highlighted separately when present.
Is a decoded JWT automatically trustworthy?
No. JWT payloads are encoded rather than inherently secret, and decoding does not prove that the signature is valid or that the claims should be trusted.
Is my JWT uploaded?
The decoding logic runs directly in your browser and does not require a server-side token decoding request.
Is JWT Decoder & Inspector free?
Yes. ToolsFaction JWT Decoder & Inspector is free to use and does not require sign-up.