JWT Decoder
Decode and inspect JSON Web Tokens with detailed claim analysis and validation
Example JWT Tokens:
About JWT:
• JSON Web Tokens are used for authentication and information exchange
• Three parts: Header (algorithm), Payload (claims), Signature (verification)
• Base64 encoded - Not encrypted, so don't store sensitive data
• Stateless - All information is contained within the token itself
• Common algorithms: HS256, RS256, ES256
Security Notes:
• Never store secrets in JWT payload - it's only base64 encoded
• Verify signatures in production - this tool only decodes
• Check expiration - Always validate exp claim
• Use HTTPS - Prevent token interception
• Short expiration - Use refresh tokens for long sessions