JWT Decoder v1.0
Decode JWT tokens to inspect their headers and payload data. Perfect for debugging authentication issues and understanding token contents.
No data uploaded – runs 100% in your browser
Used by developers in 120+ countries
v1.0 • Updated Nov 2025
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How to Use the JWT Decoder
- Paste your JWT token in the input field
- View the decoded header automatically
- Inspect the payload claims
- Check expiration and other metadata
What is JWT Decoder?
A JWT (JSON Web Token) decoder parses the three parts of a JWT - header, payload, and signature - and displays them in a readable format. This helps developers understand what data is stored in the token.
Why Use a JWT Decoder?
- Debug authentication issues quickly
- Inspect token expiration times
- View all claims and metadata
- No secret key required for decoding
- Essential for API development
Frequently Asked Questions
What is a JWT Decoder?
A JWT Decoder parses JSON Web Tokens and displays the header and payload data in a readable format without verifying the signature.
Is this JWT Decoder free?
Yes, this JWT Decoder is completely free and runs entirely in your browser.
Is my data secure?
All processing is done locally in your browser. No data is uploaded or stored.