JWT-Beispiele

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const jwt = require('jsonwebtoken');

// JWT Secret Key (store this securely!)
const SECRET_KEY = 'your-super-secret-key-change-in-production';

// User data to be included in token
const userPayload = {
  userId: '12345',
  email: '[email protected]',
  role: 'user'
};

// Create JWT Token
function createJWT(payload, expiresIn = '1h') {
  return jwt.sign(payload, SECRET_KEY, {
    expiresIn: expiresIn,
    algorithm: 'HS256',
    issuer: 'your-api.com',
    audience: 'your-app.com'
  });
}

// Verify JWT Token
function verifyJWT(token) {
  try {
    const decoded = jwt.verify(token, SECRET_KEY);
    console.log('Token is valid:', decoded);
    return decoded;
  } catch (error) {
    console.error('Token verification failed:', error.message);
    return null;
  }
}

// Decode JWT (without verification)
function decodeJWT(token) {
  const decoded = jwt.decode(token, { complete: true });
  console.log('Decoded token:', decoded);
  return decoded;
}

// Usage Examples
console.log('=== Creating JWT ===');
const token = createJWT(userPayload, '2h');
console.log('Generated Token:', token);

console.log('\n=== Verifying JWT ===');
const verified = verifyJWT(token);
console.log('Verified Payload:', verified);

console.log('\n=== Decoding JWT ===');
const decoded = decodeJWT(token);
console.log('Header:', decoded.header);
console.log('Payload:', decoded.payload);

// Check if token is expired
function isTokenExpired(decodedToken) {
  const now = Math.floor(Date.now() / 1000);
  return decodedToken.exp < now;
}

if (verified) {
  console.log('Is token expired?', isTokenExpired(verified));
}

// JWT Token Management in Browser
class AuthManager {
  constructor() {
    this.tokenKey = 'jwt_token';
    this.refreshTokenKey = 'jwt_refresh_token';
  }

  // Store JWT token
  setToken(token, rememberMe = false) {
    const storage = rememberMe ? localStorage : sessionStorage;
    storage.setItem(this.tokenKey, token);
    
    // Also store expiration time
    const decoded = this.decodeToken(token);
    if (decoded && decoded.exp) {
      storage.setItem('jwt_expires_at', decoded.exp);
    }
  }

  // Get JWT token
  getToken() {
    return localStorage.getItem(this.tokenKey) || 
           sessionStorage.getItem(this.tokenKey);
  }

  // Remove JWT token
  removeToken() {
    localStorage.removeItem(this.tokenKey);
    sessionStorage.removeItem(this.tokenKey);
    localStorage.removeItem('jwt_expires_at');
    sessionStorage.removeItem('jwt_expires_at');
  }

  // Check if token is expired
  isTokenExpired() {
    const expiresAt = localStorage.getItem('jwt_expires_at') || 
                     sessionStorage.getItem('jwt_expires_at');
    if (!expiresAt) return true;
    
    return parseInt(expiresAt) < Math.floor(Date.now() / 1000);
  }

  // Decode token without verification
  decodeToken(token) {
    try {
      const payload = JSON.parse(atob(token.split('.')[1]));
      return payload;
    } catch (error) {
      return null;
    }
  }

  // Get user info from token
  getUserInfo() {
    const token = this.getToken();
    if (!token) return null;
    
    const decoded = this.decodeToken(token);
    return decoded;
  }
}

// Axios Interceptors for JWT
const authManager = new AuthManager();

// Request Interceptor - Add JWT token to every request
axios.interceptors.request.use(
  (config) => {
    const token = authManager.getToken();
    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    return config;
  },
  (error) => {
    return Promise.reject(error);
  }
);

// Response Interceptor - Handle token expiration
axios.interceptors.response.use(
  (response) => response,
  async (error) => {
    const originalRequest = error.config;
    
    // If token expired and we haven't tried to refresh yet
    if (error.response?.status === 401 && !originalRequest._retry) {
      originalRequest._retry = true;
      
      try {
        // Try to refresh token
        const newToken = await refreshToken();
        authManager.setToken(newToken);
        
        // Retry the original request with new token
        originalRequest.headers.Authorization = `Bearer ${newToken}`;
        return axios(originalRequest);
      } catch (refreshError) {
        // If refresh fails, redirect to login
        authManager.removeToken();
        window.location.href = '/login';
        return Promise.reject(refreshError);
      }
    }
    
    return Promise.reject(error);
  }
);

// Refresh token function
async function refreshToken() {
  const refreshToken = localStorage.getItem('jwt_refresh_token');
  if (!refreshToken) {
    throw new Error('No refresh token available');
  }
  
  const response = await axios.post('/api/auth/refresh', {
    refresh_token: refreshToken
  });
  
  return response.data.access_token;
}

// API Service with JWT
class ApiService {
  async login(email, password, rememberMe = false) {
    try {
      const response = await axios.post('/api/auth/login', {
        email,
        password
      });
      
      const { access_token, refresh_token } = response.data;
      authManager.setToken(access_token, rememberMe);
      localStorage.setItem('jwt_refresh_token', refresh_token);
      
      return response.data;
    } catch (error) {
      console.error('Login failed:', error);
      throw error;
    }
  }
  
  async logout() {
    try {
      await axios.post('/api/auth/logout');
    } catch (error) {
      console.error('Logout failed:', error);
    } finally {
      authManager.removeToken();
      localStorage.removeItem('jwt_refresh_token');
    }
  }
  
  async getProtectedData() {
    const response = await axios.get('/api/protected/data');
    return response.data;
  }
}

// Usage Example
const apiService = new ApiService();

// Login
// apiService.login('[email protected]', 'password123', true)
//   .then(() => console.log('Logged in successfully'))
//   .catch(error => console.error('Login failed:', error));

// Access protected data
// apiService.getProtectedData()
//   .then(data => console.log('Protected data:', data))
//   .catch(error => console.error('Access denied:', error));

const express = require('express');
const jwt = require('jsonwebtoken');
const bcrypt = require('bcryptjs');

const app = express();
app.use(express.json());

// JWT Configuration
const JWT_CONFIG = {
  SECRET: 'your-super-secret-key-change-in-production',
  ACCESS_TOKEN_EXPIRY: '15m',
  REFRESH_TOKEN_EXPIRY: '7d',
  ALGORITHM: 'HS256'
};

// Mock user database
const users = [
  {
    id: 1,
    email: '[email protected]',
    password: '$2a$10$N9qo8uLOickgx2ZMRZoMy.Mwrz2UqJ6H4f9G4UJ8T8K8W8j8jK8iK',
    role: 'admin'
  }
];

// JWT Middleware
const authenticateJWT = (req, res, next) => {
  const authHeader = req.headers.authorization;
  
  if (!authHeader) {
    return res.status(401).json({ message: 'Authorization header required' });
  }
  
  const token = authHeader.split(' ')[1]; // Bearer TOKEN
  
  try {
    const decoded = jwt.verify(token, JWT_CONFIG.SECRET);
    req.user = decoded;
    next();
  } catch (error) {
    if (error.name === 'TokenExpiredError') {
      return res.status(401).json({ message: 'Token expired' });
    } else if (error.name === 'JsonWebTokenError') {
      return res.status(401).json({ message: 'Invalid token' });
    } else {
      return res.status(500).json({ message: 'Internal server error' });
    }
  }
};

// Role-based Authorization Middleware
const authorize = (roles = []) => {
  return (req, res, next) => {
    if (!req.user) {
      return res.status(401).json({ message: 'Authentication required' });
    }
    
    if (roles.length && !roles.includes(req.user.role)) {
      return res.status(403).json({ message: 'Insufficient permissions' });
    }
    
    next();
  };
};

// Generate Access Token
const generateAccessToken = (user) => {
  return jwt.sign(
    { 
      userId: user.id, 
      email: user.email, 
      role: user.role 
    },
    JWT_CONFIG.SECRET,
    { 
      expiresIn: JWT_CONFIG.ACCESS_TOKEN_EXPIRY,
      algorithm: JWT_CONFIG.ALGORITHM,
      issuer: 'your-api.com',
      audience: 'your-app.com'
    }
  );
};

// Generate Refresh Token
const generateRefreshToken = (user) => {
  return jwt.sign(
    { 
      userId: user.id,
      tokenType: 'refresh'
    },
    JWT_CONFIG.SECRET,
    { 
      expiresIn: JWT_CONFIG.REFRESH_TOKEN_EXPIRY,
      algorithm: JWT_CONFIG.ALGORITHM
    }
  );
};

// Login Route
app.post('/api/auth/login', async (req, res) => {
  try {
    const { email, password } = req.body;
    
    // Find user
    const user = users.find(u => u.email === email);
    if (!user) {
      return res.status(401).json({ message: 'Invalid credentials' });
    }
    
    // Check password
    const isValidPassword = await bcrypt.compare(password, user.password);
    if (!isValidPassword) {
      return res.status(401).json({ message: 'Invalid credentials' });
    }
    
    // Generate tokens
    const accessToken = generateAccessToken(user);
    const refreshToken = generateRefreshToken(user);
    
    res.json({
      access_token: accessToken,
      refresh_token: refreshToken,
      user: {
        id: user.id,
        email: user.email,
        role: user.role
      }
    });
  } catch (error) {
    res.status(500).json({ message: 'Internal server error' });
  }
});

// Refresh Token Route
app.post('/api/auth/refresh', (req, res) => {
  try {
    const { refresh_token } = req.body;
    
    if (!refresh_token) {
      return res.status(400).json({ message: 'Refresh token required' });
    }
    
    const decoded = jwt.verify(refresh_token, JWT_CONFIG.SECRET);
    
    if (decoded.tokenType !== 'refresh') {
      return res.status(401).json({ message: 'Invalid refresh token' });
    }
    
    // Find user and generate new access token
    const user = users.find(u => u.id === decoded.userId);
    if (!user) {
      return res.status(401).json({ message: 'User not found' });
    }
    
    const newAccessToken = generateAccessToken(user);
    
    res.json({
      access_token: newAccessToken
    });
  } catch (error) {
    res.status(401).json({ message: 'Invalid refresh token' });
  }
});

// Protected Routes
app.get('/api/protected', authenticateJWT, (req, res) => {
  res.json({ 
    message: 'This is a protected route',
    user: req.user 
  });
});

app.get('/api/admin', authenticateJWT, authorize(['admin']), (req, res) => {
  res.json({ 
    message: 'Admin access granted',
    user: req.user 
  });
});

// Logout Route
app.post('/api/auth/logout', authenticateJWT, (req, res) => {
  // In a real app, you might want to blacklist the token
  res.json({ message: 'Logged out successfully' });
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});

const jwt = require('jsonwebtoken');
const crypto = require('crypto');

// Advanced JWT Security Implementation
class JWTSecurityManager {
  constructor(config) {
    const generatedKeyPair = this.generateKeyPair();
    this.config = {
      // Use asymmetric keys for better security
      publicKey: config.publicKey || generatedKeyPair.publicKey,
      privateKey: config.privateKey || generatedKeyPair.privateKey,
      
      // Token configuration
      accessTokenExpiry: config.accessTokenExpiry || '15m',
      refreshTokenExpiry: config.refreshTokenExpiry || '7d',
      issuer: config.issuer || 'your-api.com',
      audience: config.audience || 'your-app.com',
      
      // Security settings
      algorithm: 'RS256', // Use RSA for asymmetric encryption
      keyRotationInterval: config.keyRotationInterval || 86400000, // 24 hours
      maxTokenAge: config.maxTokenAge || 3600000, // 1 hour
      
      // Blacklist configuration
      blacklistType: config.blacklistType || 'memory', // 'redis' or 'memory'
      redisConfig: config.redisConfig || { host: 'localhost', port: 6379 }
    };
    
    this.blacklist = new Map();
    this.currentKeyId = this.generateKeyId();
    this.keys = new Map([[this.currentKeyId, this.config.publicKey]]);
  }
  
  // Generate RSA key pair
  generateKeyPair() {
    const { publicKey, privateKey } = crypto.generateKeyPairSync('rsa', {
      modulusLength: 2048,
      publicKeyEncoding: {
        type: 'spki',
        format: 'pem'
      },
      privateKeyEncoding: {
        type: 'pkcs8',
        format: 'pem'
      }
    });
    return { publicKey, privateKey };
  }
  
  // Generate unique key ID
  generateKeyId() {
    return `key-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
  }
  
  // Rotate keys
  rotateKeys() {
    const oldKeyId = this.currentKeyId;
    const newKeyId = this.generateKeyId();
    const newKeyPair = this.generateKeyPair();
    
    this.keys.set(newKeyId, newKeyPair.publicKey);
    this.config.privateKey = newKeyPair.privateKey;
    this.config.publicKey = newKeyPair.publicKey;
    
    // Keep old keys for 1 hour to validate existing tokens
    setTimeout(() => {
      this.keys.delete(oldKeyId);
    }, 3600000);
    
    this.currentKeyId = newKeyId;
    return newKeyId;
  }
  
  // Add token to blacklist
  async addToBlacklist(token, expiryTime) {
    const tokenId = this.getTokenId(token);
    const expiry = expiryTime || this.getTokenExpiry(token);
    
    if (this.config.blacklistType === 'redis') {
      // Redis implementation for distributed systems
      await this.redis.setex(`jwt:blacklist:${tokenId}`, expiry, '1');
    } else {
      // In-memory blacklist for single instance
      this.blacklist.set(tokenId, Date.now() + (expiry * 1000));
    }
  }
  
  // Check if token is blacklisted
  async isBlacklisted(token) {
    const tokenId = this.getTokenId(token);
    
    if (this.config.blacklistType === 'redis') {
      const result = await this.redis.get(`jwt:blacklist:${tokenId}`);
      return !!result;
    } else {
      const expiry = this.blacklist.get(tokenId);
      return expiry && expiry > Date.now();
    }
  }
  
  // Extract token ID (jti claim)
  getTokenId(token) {
    const decoded = jwt.decode(token);
    return decoded.jti;
  }
  
  // Get token expiry
  getTokenExpiry(token) {
    const decoded = jwt.decode(token);
    return decoded.exp - Math.floor(Date.now() / 1000);
  }
  
  // Create JWT with enhanced security
  async createToken(payload, options = {}) {
    const tokenId = crypto.randomBytes(16).toString('hex');
    const keyId = this.currentKeyId;
    
    const enhancedPayload = {
      ...payload,
      jti: tokenId, // JWT ID for blacklisting
      iat: Math.floor(Date.now() / 1000),
      iss: this.config.issuer,
      aud: this.config.audience
    };
    
    const tokenOptions = {
      algorithm: this.config.algorithm,
      expiresIn: options.expiresIn || this.config.accessTokenExpiry,
      keyid: keyId
    };
    
    return jwt.sign(enhancedPayload, this.config.privateKey, tokenOptions);
  }
  
  // Verify JWT with enhanced security checks
  async verifyToken(token) {
    try {
      // Check blacklist first
      if (await this.isBlacklisted(token)) {
        throw new Error('Token has been revoked');
      }
      
      // Decode token to get key ID
      const decoded = jwt.decode(token, { complete: true });
      if (!decoded || !decoded.header || !decoded.header.kid) {
        throw new Error('Invalid token structure');
      }
      const keyId = decoded.header.kid;
      
      // Verify the token hasn't been tampered with
      const key = this.keys.get(keyId);
      if (!key) {
        throw new Error('Invalid key ID');
      }
      
      // Verify token signature and claims
      const verified = jwt.verify(token, key, {
        algorithms: [this.config.algorithm],
        issuer: this.config.issuer,
        audience: this.config.audience,
        maxAge: this.config.maxTokenAge
      });
      
      // Additional security checks
      if (verified.iat > Math.floor(Date.now() / 1000)) {
        throw new Error('Token issued in the future');
      }
      
      if (verified.exp - verified.iat > this.config.maxTokenAge / 1000) {
        throw new Error('Token validity period exceeds maximum allowed');
      }
      
      return verified;
    } catch (error) {
      console.error('Token verification failed:', error.message);
      throw error;
    }
  }
  
  // Middleware for Express.js
  middleware() {
    return async (req, res, next) => {
      try {
        const authHeader = req.headers.authorization;
        
        if (!authHeader || !authHeader.startsWith('Bearer ')) {
          return res.status(401).json({ error: 'Authorization header required' });
        }
        
        const token = authHeader.substring(7);
        const decoded = await this.verifyToken(token);
        
        req.user = decoded;
        req.token = token;
        
        next();
      } catch (error) {
        return res.status(401).json({ 
          error: 'Invalid or expired token',
          details: error.message 
        });
      }
    };
  }
  
  // Rate limiting middleware
  rateLimitMiddleware(maxAttempts = 5, windowMs = 900000) {
    const attempts = new Map();
    
    return async (req, res, next) => {
      const ip = req.ip || req.connection.remoteAddress;
      const now = Date.now();
      
      if (!attempts.has(ip)) {
        attempts.set(ip, []);
      }
      
      const userAttempts = attempts.get(ip);
      const validAttempts = userAttempts.filter(time => now - time < windowMs);
      
      if (validAttempts.length >= maxAttempts) {
        return res.status(429).json({ error: 'Too many attempts' });
      }
      
      validAttempts.push(now);
      attempts.set(ip, validAttempts);
      
      next();
    };
  }
}

// Usage Example
const jwtManager = new JWTSecurityManager({
  issuer: 'your-api.com',
  audience: 'your-app.com',
  accessTokenExpiry: '15m',
  refreshTokenExpiry: '7d'
});

// Apply to Express app
const express = require('express');
const app = express();

// Security middleware stack
app.use('/api/*', [
  jwtManager.rateLimitMiddleware(),
  jwtManager.middleware()
]);

// Protected route
app.get('/api/protected', (req, res) => {
  res.json({ 
    message: 'Secure access granted',
    user: req.user 
  });
});

// Logout route
app.post('/api/logout', async (req, res) => {
  try {
    await jwtManager.addToBlacklist(req.token);
    res.json({ message: 'Logged out successfully' });
  } catch (error) {
    res.status(500).json({ error: 'Logout failed' });
  }
});

const jwt = require('jsonwebtoken');
const { expect } = require('chai');
const sinon = require('sinon');
const JWTSecurityManager = require('./jwt-security-manager');

describe('JWT Implementation Tests', () => {
  let jwtManager;
  const testConfig = {
    issuer: 'test-api.com',
    audience: 'test-app.com',
    accessTokenExpiry: '1h',
    refreshTokenExpiry: '7d',
    algorithm: 'HS256'
  };
  
  beforeEach(() => {
    jwtManager = new JWTSecurityManager(testConfig);
  });
  
  describe('Token Creation', () => {
    it('should create a valid JWT token', () => {
      const payload = { userId: 123, email: '[email protected]' };
      const token = jwtManager.createToken(payload);
      
      expect(token).to.be.a('string');
      expect(token.split('.')).to.have.lengthOf(3);
    });
    
    it('should include required claims', () => {
      const payload = { userId: 123 };
      const token = jwtManager.createToken(payload);
      const decoded = jwt.decode(token);
      
      expect(decoded).to.have.property('iat');
      expect(decoded).to.have.property('iss', testConfig.issuer);
      expect(decoded).to.have.property('aud', testConfig.audience);
      expect(decoded).to.have.property('jti');
      expect(decoded).to.have.property('userId', 123);
    });
  });
  
  describe('Token Verification', () => {
    it('should verify a valid token', async () => {
      const payload = { userId: 123, email: '[email protected]' };
      const token = jwtManager.createToken(payload);
      
      const verified = await jwtManager.verifyToken(token);
      expect(verified).to.have.property('userId', 123);
      expect(verified).to.have.property('email', '[email protected]');
    });
    
    it('should reject expired tokens', async () => {
      const payload = { userId: 123 };
      const token = jwtManager.createToken(payload, { expiresIn: '-1s' });
      
      try {
        await jwtManager.verifyToken(token);
        expect.fail('Should have thrown error for expired token');
      } catch (error) {
        expect(error.message).to.include('expired');
      }
    });
    
    it('should reject tokens with invalid signature', async () => {
      const payload = { userId: 123 };
      const token = jwtManager.createToken(payload);
      const tamperedToken = token + 'tampered';
      
      try {
        await jwtManager.verifyToken(tamperedToken);
        expect.fail('Should have thrown error for invalid signature');
      } catch (error) {
        expect(error.message).to.include('invalid signature');
      }
    });
  });
  
  describe('Token Blacklisting', () => {
    it('should blacklist and reject tokens', async () => {
      const payload = { userId: 123 };
      const token = jwtManager.createToken(payload);
      
      // Token should be valid initially
      let verified = await jwtManager.verifyToken(token);
      expect(verified).to.exist;
      
      // Blacklist the token
      await jwtManager.addToBlacklist(token);
      
      // Token should now be rejected
      try {
        await jwtManager.verifyToken(token);
        expect.fail('Should have thrown error for blacklisted token');
      } catch (error) {
        expect(error.message).to.include('revoked');
      }
    });
  });
  
  describe('Middleware Integration', () => {
    let req, res, next;
    
    beforeEach(() => {
      req = {
        headers: {},
        ip: '127.0.0.1'
      };
      res = {
        status: sinon.stub().returnsThis(),
        json: sinon.stub()
      };
      next = sinon.stub();
    });
    
    it('should pass with valid token', async () => {
      const payload = { userId: 123 };
      const token = jwtManager.createToken(payload);
      req.headers.authorization = `Bearer ${token}`;
      
      const middleware = jwtManager.middleware();
      await middleware(req, res, next);
      
      expect(next.calledOnce).to.be.true;
      expect(req.user).to.have.property('userId', 123);
    });
    
    it('should reject missing authorization header', async () => {
      const middleware = jwtManager.middleware();
      await middleware(req, res, next);
      
      expect(next.called).to.be.false;
      expect(res.status.calledWith(401)).to.be.true;
      expect(res.json.calledWith({ error: 'Authorization header required' })).to.be.true;
    });
    
    it('should reject invalid token format', async () => {
      req.headers.authorization = 'InvalidTokenFormat';
      
      const middleware = jwtManager.middleware();
      await middleware(req, res, next);
      
      expect(next.called).to.be.false;
      expect(res.status.calledWith(401)).to.be.true;
    });
  });
  
  describe('Key Rotation', () => {
    it('should rotate keys successfully', () => {
      const originalKeyId = jwtManager.currentKeyId;
      const newKeyId = jwtManager.rotateKeys();
      
      expect(newKeyId).to.not.equal(originalKeyId);
      expect(jwtManager.keys.has(originalKeyId)).to.be.true;
      expect(jwtManager.keys.has(newKeyId)).to.be.true;
    });
    
    it('should verify tokens created with old keys', async () => {
      const originalKeyId = jwtManager.currentKeyId;
      const payload = { userId: 123 };
      const token = jwtManager.createToken(payload);
      
      // Rotate keys
      jwtManager.rotateKeys();
      
      // Old token should still be valid
      const verified = await jwtManager.verifyToken(token);
      expect(verified).to.have.property('userId', 123);
    });
  });
});

describe('JWT Security Vulnerabilities', () => {
  it('should prevent algorithm confusion attacks', async () => {
    // Create a token with 'none' algorithm
    const maliciousToken = jwt.sign(
      { userId: 'admin', isAdmin: true },
      'any-secret',
      { algorithm: 'none' }
    );
    
    try {
      await jwtManager.verifyToken(maliciousToken);
      expect.fail('Should have rejected algorithm none');
    } catch (error) {
      expect(error.message).to.not.include('admin');
    }
  });
  
  it('should prevent token replay attacks', async () => {
    const payload = { userId: 123 };
    const token = jwtManager.createToken(payload);
    
    // First verification should succeed
    await jwtManager.verifyToken(token);
    
    // Blacklist the token
    await jwtManager.addToBlacklist(token);
    
    // Second verification should fail
    try {
      await jwtManager.verifyToken(token);
      expect.fail('Should have prevented replay attack');
    } catch (error) {
      expect(error.message).to.include('revoked');
    }
  });
});

// Performance Tests
describe('JWT Performance', () => {
  it('should handle token creation under 10ms', () => {
    const payload = { userId: 123, email: '[email protected]' };
    const start = Date.now();
    
    for (let i = 0; i < 1000; i++) {
      jwtManager.createToken(payload);
    }
    
    const duration = Date.now() - start;
    const avgTime = duration / 1000;
    
    console.log(`Average token creation time: ${avgTime}ms`);
    expect(avgTime).to.be.lessThan(10);
  });
  
  it('should handle token verification under 5ms', async () => {
    const payload = { userId: 123, email: '[email protected]' };
    const token = jwtManager.createToken(payload);
    
    const start = Date.now();
    
    for (let i = 0; i < 1000; i++) {
      await jwtManager.verifyToken(token);
    }
    
    const duration = Date.now() - start;
    const avgTime = duration / 1000;
    
    console.log(`Average token verification time: ${avgTime}ms`);
    expect(avgTime).to.be.lessThan(5);
  });
});

// Integration Tests
describe('JWT Integration Tests', () => {
  let app, server;
  
  before(() => {
    const express = require('express');
    app = express();
    app.use(express.json());
    
    // Apply JWT middleware
    app.use('/api/*', jwtManager.middleware());
    
    app.get('/api/test', (req, res) => {
      res.json({ user: req.user });
    });
    
    server = app.listen(0); // Random available port
  });
  
  after(() => {
    server.close();
  });
  
  it('should integrate with Express.js successfully', async () => {
    const payload = { userId: 123, email: '[email protected]' };
    const token = jwtManager.createToken(payload);
    
    const response = await fetch(`http://localhost:${server.address().port}/api/test`, {
      headers: {
        'Authorization': `Bearer ${token}`
      }
    });
    
    const data = await response.json();
    expect(data.user).to.have.property('userId', 123);
  });
});