JWT Security Analyzer

Comprehensive JWT (JSON Web Token) security analysis tool that decodes tokens, validates algorithms, checks expiration times, and identifies potential security vulnerabilities. Analyze header claims, payload data, signature algorithms, and receive detailed security recommendations. Perfect for developers, security engineers, and DevOps teams working with authentication systems.
Vulnerability Detection Algorithm Validation Expiration Check Security Recommendations
SECURE
Protected Connection
Header.Payload.Signature
HS256, RS256, ES256
exp, iat, sub, aud validation
Trust Score
5.0
JWT Token Input
Enter a complete JWT token to analyze
Security Analysis Settings
Token Verification
Optional: Enter secret key to verify signature
Optional: Enter public key for signature verification
Quick Actions

Practical Applications & Use Cases

Security Vulnerability Assessment

Identify JWT implementation weaknesses

  • Check algorithm confusion
  • Verify signature validation
  • Analyze token expiration
  • Detect weak secrets
Pro Tip: Always test with production-like tokens but never use real secrets

API Penetration Testing

Test JWT-based authentication systems

  • Test token manipulation
  • Check claim validation
  • Verify audience checks
  • Test refresh mechanisms
Pro Tip: Document all findings for development team remediation

Compliance & Best Practices

Ensure JWT implementation meets standards

  • Verify OWASP compliance
  • Check industry standards
  • Validate key rotation
  • Ensure proper encryption
Pro Tip: Reference NIST guidelines for cryptographic standards

Industry-Specific Applications

fintech:

Banking APIs, payment systems, trading platforms

healthcare:

HIPAA compliance, patient data access, medical APIs

enterprise:

SSO systems, microservices auth, API gateways

government:

Citizen services, secure communications, data access

saas:

Multi-tenant systems, API authentication, user sessions

Help & Related Tools

Everything you need to know

FAQ Frequently Asked Questions

What security features does the JWT Security Analyzer provide?
The tool offers comprehensive JWT security analysis including algorithm validation, expiration checking, signature verification, vulnerability detection, claims analysis, and detailed security recommendations. Perfect for identifying common JWT security issues and implementation problems.
How do I analyze my JWT token for security vulnerabilities?
Simply paste your JWT token into the input field and click "Analyze JWT Token". The tool will automatically decode the token, check for security issues, validate algorithms, and provide detailed recommendations for improving token security.
Is the JWT Security Analyzer safe to use with production tokens?
Yes, all analysis happens entirely in your browser with no external API calls or data transmission. Your JWT tokens never leave your device, ensuring complete privacy and security during analysis.
What JWT algorithms and token types are supported?
The analyzer supports all standard JWT algorithms including HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, ES512, and can identify security issues with unsupported or weak algorithms like "none" or deprecated hash functions.
Can I export the security analysis results?
Absolutely! Export comprehensive security reports in Markdown format, copy decoded token sections, and download detailed analysis including vulnerability findings, claims validation, and security recommendations for documentation and compliance purposes.

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