JWT Decoder Online Free
Decode JSON Web Tokens instantly. View JWT header, payload, claims, expiration time and token structure directly in your browser.
Header
Decoded JWT header will appear here.
Payload
Decoded JWT payload will appear here.
How to Decode a JWT
Inspect a JSON Web Token in three simple steps.
1. Paste token
Copy your JWT and paste it into the decoder box.
2. Decode JWT
The tool separates and decodes the header and payload.
3. Review claims
Check token claims like issuer, subject, issued time and expiration.
Inspect JWT tokens for APIs and authentication flows.
This JWT Decoder helps developers debug authentication tokens, inspect token claims, read expiration dates and understand JSON Web Token structure.
You can decode the JWT header and payload, view common claims such as issuer, subject, audience, issued time and expiration, and copy the decoded JSON.
What is a JWT?
A JWT, or JSON Web Token, is a compact token format often used in authentication and authorization systems. It usually contains a header, payload and signature.
This decoder reads the visible header and payload data, but it does not verify whether the signature is valid.
When should you use it?
- Debugging login and API authentication flows
- Inspecting JWT header and payload claims
- Checking token expiration timestamps
- Reading issuer, subject and audience values
- Understanding token structure during development
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JWT Decoder FAQ
Common questions about decoding JSON Web Tokens.
What is a JWT?
A JWT, or JSON Web Token, is a compact token format often used for authentication and sending claims between systems.
Does this tool verify JWT signatures?
No. This decoder only reads the token header and payload. Signature verification requires a secret or public key.
What are JWT claims?
JWT claims are pieces of information inside the payload, such as issuer, subject, audience, issued time and expiration time.
Is this JWT Decoder free?
Yes. This online JWT Decoder is free to use.
Can I decode JWT tokens in my browser?
Yes. This tool decodes JWT header and payload directly in your browser.
Is it safe to paste a JWT here?
The tool runs in your browser, but you should avoid pasting sensitive production tokens into any online page unless you understand the risks.
How many parts does a JWT have?
A standard JWT has three parts separated by dots: header, payload and signature.
Can I check if a token is expired?
Yes. If the token payload includes an exp claim, this tool shows the expiration date and status.