JWTs enable stateless authentication. Here's how to implement them securely.
JWT Structure
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Token Generation
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Token Verification
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Refresh Token Flow
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Client-Side Token Management
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Security Considerations
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Best Practices
Token Security:
✓ Use strong, unique secrets
✓ Short access token expiry (15m)
✓ Store refresh tokens securely
✓ Implement token rotation
Storage:
✓ httpOnly cookies for refresh tokens
✓ Memory for access tokens
✓ Never localStorage for tokens
✓ Use secure cookie flags
Validation:
✓ Verify signature
✓ Check expiration
✓ Validate issuer and audience
✓ Use explicit algorithm
Revocation:
✓ Implement token blocklist
✓ Store refresh tokens in DB
✓ Support forced logout
✓ Handle token rotation
Conclusion
JWTs enable scalable authentication when implemented securely. Use short-lived access tokens with refresh token rotation, store tokens appropriately, and implement proper revocation. Never store sensitive data in tokens and always validate on the server side.