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Secure Storage

localStorage is vulnerable to XSS attacks and should not be used for storing sensitive tokens in production applications.
Here are recommended approaches for token storage, in order of security:
  1. HttpOnly Cookies (Most Secure)
    • Protected from XSS attacks
    • Automatic CSRF protection when configured properly
    • Handled automatically by browsers
  2. Web Workers + IndexedDB
    • Isolated from main thread
    • Protected from XSS
    • More complex implementation
  3. In-Memory Storage
    • Cleared on page refresh
    • Protected from XSS
    • Requires state management solution

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Server-Side Configuration

Your server should set cookies with secure options: 
// Example server-side cookie configuration (Express.js)
res.cookie('jwt_token', token, {
    httpOnly: true,     // Prevents JavaScript access
    secure: true,       // Requires HTTPS
    sameSite: 'strict', // CSRF protection
    maxAge: 3600000,    // 1 hour
    path: '/'           // Cookie path
});

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Security Best Practices

  1. Always use HTTPS for token transmission
  2. Set appropriate cookie flags:
    • HttpOnly
    • Secure
    • SameSite=Strict
  3. Implement CSRF protection
  4. Use short token expiration times
  5. Rotate refresh tokens