JWT Decoder & Validator Tool
Enter a JWT token to decode or validate it securely within your browser.
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Start Free TrialHow to Use the JWT Decoder & Validator Tool
Simply paste your JWT token in the input field and click "Decode JWT" to view its contents. If you want to validate the signature, check the validation option and provide your secret key or public key.
Understanding JSON Web Tokens (JWT)
JSON Web Tokens are an open, industry standard RFC 7519 method for representing claims securely between two parties. They consist of three parts: header, payload, and signature, and are often used for authentication and information exchange.
Common Use Cases for JWT
JWTs are perfect for:
- Authentication: Once a user logs in, each subsequent request includes the JWT, allowing the user to access resources
- Information Exchange: Securely transmitting information between parties
- Authorization: When the token is sent, the server can verify the claims to authorize access
- Microservices Communication: Secure communication between services
JWT Security Best Practices
Keep these security practices in mind when working with JWTs:
- Always use HTTPS to prevent token theft in transit
- Set appropriate expiration times for your tokens
- Keep secret keys secure and regularly rotate them
- Validate tokens on the server side before trusting their contents
- Consider using refresh tokens for long-lived sessions
Frequently Asked Questions
Q. Is this tool secure for handling sensitive JWTs?
Yes, all decoding and validation happens client-side in your browser. Your tokens and keys never leave your device.
Q. What's the difference between decoding and validating a JWT?
Decoding simply shows the content of the token parts. Validation verifies if the token's signature is valid and if the token hasn't been tampered with.
Q. Can I validate tokens signed with RS256 (asymmetric encryption)?
Yes, you can paste your public key to validate tokens signed with RS256 or other asymmetric algorithms.
Q. What if my token has expired?
The tool will show you that the token has expired during validation, but you can still decode and view its contents.
Q. Can I trust this tool with sensitive tokens?
This tool runs entirely in your browser - no data is sent to any server. However, for highly sensitive production tokens, it's recommended to use secure, controlled environments.
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