JWT Decoder
Decode and verify JSON Web Tokens (JWT) with our powerful online tool. Visualize header and payload data, validate signatures, and debug JWT tokens easily.
Features
Token Parsing
Parse and decode JWT tokens to view header and payload data in a readable format.
Signature Verification
Verify JWT signatures with support for multiple algorithms including HS256, RS256, and more.
Token Analysis
Analyze token structure, expiration, and claims with detailed insights.
How It Works
1. Input JWT Token
Paste your JWT token into the decoder input field. The tool automatically validates the token format.
2. Decode and Parse
The decoder splits the token into its components (header, payload, signature) and decodes the base64 content.
3. Analyze Results
View decoded data in a formatted JSON structure, check token validity, and verify signatures if needed.
Frequently Asked Questions
What is a JWT token?
JSON Web Token (JWT) is a compact, URL-safe means of representing claims between two parties. It consists of three parts: header, payload, and signature.
Is this decoder secure?
Yes, all processing is done locally in your browser. No token data is sent to any server or stored anywhere, ensuring complete privacy and security.
What algorithms are supported?
The decoder supports all standard JWT algorithms including HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, ES512, and more.
Tips for Using JWT Decoder
- Always verify token signatures in production environments
- Check token expiration dates and issuer claims
- Be cautious with sensitive data in JWT payloads
- Use appropriate algorithms based on your security requirements
- Keep your signing keys secure and rotate them regularly