What is a JWT Token?
JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
Common Uses:
- Authentication and authorization
- Secure information exchange
- Stateless session management
- API security
JWT Structure:
- Header - Algorithm & token type
- Payload - Claims and data
- Signature - Verification data
JWT Best Practices
Never Share Secret Keys
Keep your JWT secret keys secure and never include them in client-side code or public repositories.
Always Verify on Server
Always verify JWT signatures on your server before trusting any data contained in the token.
Use HTTPS Always
Always transmit JWT tokens over HTTPS to prevent man-in-the-middle attacks and token interception.
Set Reasonable Expiration
Use short expiration times for tokens and implement refresh token mechanisms for better security.
How It Works
Paste JWT Token
Copy and paste your JWT token into the input area on the left side.
Click Decode
Click the "Decode Token" button to process and analyze your JWT token.
View Results
Instantly view the decoded header, payload, and signature in formatted JSON.
Why Choose Our JWT Decoder
100% Free & Secure
Completely free tool with no registration required. Your tokens are never stored.
Fast & Accurate
Get immediate results with our optimized PHP decoding engine.
Clean Interface
Easy-to-use interface with color-coded JSON output for better readability.
No Verification
We don't verify signatures for security - pure decoding only.
Mobile Friendly
Works perfectly on all devices and screen sizes.
Educational
Learn about JWT structure with our detailed explanations.
Use Cases
Debugging Authentication
Developers can debug JWT-based authentication systems by inspecting token contents.
Learning & Education
Students and learners can understand JWT structure and claims format.
Security Analysis
Security engineers can inspect token claims and identify potential vulnerabilities.
API Testing
Backend developers can test and validate JWT tokens in API development.