JWT Authentication Complete Guide

# JWT Authentication Guide

## JWT Basics
- Understand token structure
- Use proper signing algorithms
- Set appropriate expiration
- Store tokens securely

## Refresh Tokens
- Implement refresh token rotation
- Store refresh tokens securely
- Handle token refresh flow
- Revoke tokens properly

## Security Best Practices
- Use HTTPS only
- Validate token signatures
- Implement token blacklisting
- Set short expiration times

## Implementation
- Create middleware for verification
- Handle token in headers
- Implement logout properly
- Use httpOnly cookies