JWT Decoder
Decode and analyze JSON Web Tokens (JWT) to view header, payload, and signature information
JWT Token Input
Paste your JWT token below to decode and analyze its contents
About JWT Decoder
Features
- • Decode JWT header and payload
- • View token expiration status
- • Display standard JWT claims
- • Copy decoded data to clipboard
- • Secure signature handling
Security
- • Client-side processing only
- • No data sent to servers
- • Signature verification not performed
- • Use only for debugging purposes
- • Never share JWT tokens publicly
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Frequently Asked Questions
- What is a JWT and why would I need to decode it?
- JWT (JSON Web Token) is a secure way to transmit information between parties. Developers often need to decode JWTs to inspect user claims, debug authentication issues, or understand token structure without compromising security.
- Can I decode any JWT token safely?
- Yes! JWT decoding only reads the header and payload - it doesn't require or expose the secret key. The signature verification requires the secret, which stays secure. This tool only decodes the readable parts.
- What information will I see in a decoded JWT?
- You'll see the header (algorithm, token type), payload (user claims, expiration, issuer), and signature. Common payload fields include user ID, roles, permissions, issue time, and expiration time.
- Is it safe to paste my JWT tokens here?
- Yes! All JWT decoding happens locally in your browser. No tokens are sent to servers, ensuring your authentication tokens remain private and secure.
How to use JWT Decoder
Follow these simple steps to get started with the JWT Decoder tool
- 1
Copy your JWT token from your application or authentication response
- 2
Paste the token into the input field (starts with 'eyJ' typically)
- 3
The tool automatically decodes and displays the header information
- 4
Review the payload section for user claims and token details
- 5
Check the signature section and validity status of the token