Generate Production-Ready JWT Secrets in One Click

const jwt = require('jsonwebtoken');

// Generate token (login)
function generateToken(user) {
  const payload = {
    userId: user.id,
    email: user.email,
    role: user.role
  };
  
  return jwt.sign(payload, process.env.JWT_SECRET, {
    algorithm: 'HS256',
    expiresIn: '24h',
    issuer: 'your-app-name',
    audience: 'your-app-users'
  });
}

// Verify token (middleware)
function verifyToken(req, res, next) {
  const token = req.headers.authorization?.split(' ')[1];
  
  if (!token) {
    return res.status(401).json({ error: 'Access token required' });
  }
  
  try {
    const decoded = jwt.verify(token, process.env.JWT_SECRET, {
      algorithms: ['HS256']
    });
    req.user = decoded;
    next();
  } catch (error) {
    return res.status(401).json({ error: 'Invalid token' });
  }
}

import jwt
import os
from datetime import datetime, timedelta
from functools import wraps
from flask import request, jsonify

JWT_SECRET = os.getenv('JWT_SECRET')
JWT_ALGORITHM = 'HS256'

def generate_token(user_data):
    payload = {
        'user_id': user_data['id'],
        'email': user_data['email'],
        'exp': datetime.utcnow() + timedelta(hours=24),
        'iat': datetime.utcnow(),
        'iss': 'your-app-name'
    }
    
    return jwt.encode(payload, JWT_SECRET, algorithm=JWT_ALGORITHM)

def verify_token(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        token = request.headers.get('Authorization')
        
        if not token:
            return jsonify({'error': 'Token missing'}), 401
            
        try:
            token = token.split(' ')[1]  # Remove 'Bearer '
            decoded = jwt.decode(token, JWT_SECRET, algorithms=[JWT_ALGORITHM])
            request.user = decoded
        except jwt.ExpiredSignatureError:
            return jsonify({'error': 'Token expired'}), 401
        except jwt.InvalidTokenError:
            return jsonify({'error': 'Invalid token'}), 401
            
        return f(*args, **kwargs)
    return decorated

import io.jsonwebtoken.*;
import io.jsonwebtoken.security.Keys;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class JwtUtil {
    
    @Value("${jwt.secret}")
    private String jwtSecret;
    
    private final int jwtExpirationMs = 86400000; // 24 hours

    public String generateToken(String username, String role) {
        return Jwts.builder()
                .setSubject(username)
                .claim("role", role)
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + jwtExpirationMs))
                .signWith(Keys.hmacShaKeyFor(jwtSecret.getBytes()), SignatureAlgorithm.HS256)
                .compact();
    }

    public Claims extractClaims(String token) {
        return Jwts.parserBuilder()
                .setSigningKey(Keys.hmacShaKeyFor(jwtSecret.getBytes()))
                .build()
                .parseClaimsJws(token)
                .getBody();
    }

    public boolean isTokenExpired(String token) {
        return extractClaims(token).getExpiration().before(new Date());
    }

    public boolean validateToken(String token) {
        try {
            extractClaims(token);
            return true;
        } catch (JwtException | IllegalArgumentException e) {
            return false;
        }
    }
}

package middleware

import (
    "net/http"
    "strings"
    "time"

    "github.com/gin-gonic/gin"
    "github.com/golang-jwt/jwt/v4"
)

var jwtSecret = []byte("your-secret-here")

type Claims struct {
    UserID string `json:"user_id"`
    Role   string `json:"role"`
    jwt.RegisteredClaims
}

func GenerateToken(userID, role string) (string, error) {
    claims := Claims{
        UserID: userID,
        Role:   role,
        RegisteredClaims: jwt.RegisteredClaims{
            ExpiresAt: jwt.NewNumericDate(time.Now().Add(24 * time.Hour)),
            IssuedAt:  jwt.NewNumericDate(time.Now()),
            Issuer:    "your-app",
        },
    }

    token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
    return token.SignedString(jwtSecret)
}

func AuthMiddleware() gin.HandlerFunc {
    return func(c *gin.Context) {
        authHeader := c.GetHeader("Authorization")
        if authHeader == "" {
            c.JSON(http.StatusUnauthorized, gin.H{"error": "Authorization header required"})
            c.Abort()
            return
        }

        tokenString := strings.TrimPrefix(authHeader, "Bearer ")
        
        claims := &Claims{}
        token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
            return jwtSecret, nil
        })

        if err != nil || !token.Valid {
            c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token"})
            c.Abort()
            return
        }

        c.Set("userID", claims.UserID)
        c.Set("role", claims.Role)
        c.Next()
    }
}

using Microsoft.IdentityModel.Tokens;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;

public class JwtService
{
    private readonly string _secret = "your-secret-here";
    private readonly string _issuer = "your-app";

    public string GenerateToken(string userId, string role)
    {
        var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_secret));
        var credentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

        var claims = new[]
        {
            new Claim(JwtRegisteredClaimNames.Sub, userId),
            new Claim(ClaimTypes.Role, role),
            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
            new Claim(JwtRegisteredClaimNames.Iat, 
                DateTimeOffset.UtcNow.ToUnixTimeSeconds().ToString(), ClaimValueTypes.Integer64)
        };

        var token = new JwtSecurityToken(
            issuer: _issuer,
            audience: _issuer,
            claims: claims,
            expires: DateTime.UtcNow.AddHours(24),
            signingCredentials: credentials
        );

        return new JwtSecurityTokenHandler().WriteToken(token);
    }

    public ClaimsPrincipal ValidateToken(string token)
    {
        var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_secret));
        var tokenHandler = new JwtSecurityTokenHandler();

        var validationParameters = new TokenValidationParameters
        {
            ValidateIssuerSigningKey = true,
            IssuerSigningKey = key,
            ValidateIssuer = true,
            ValidIssuer = _issuer,
            ValidateAudience = true,
            ValidAudience = _issuer,
            ClockSkew = TimeSpan.Zero
        };

        return tokenHandler.ValidateToken(token, validationParameters, out SecurityToken validatedToken);
    }
}

<?php

namespace App\Helpers;

use Firebase\JWT\JWT;
use Firebase\JWT\Key;
use Exception;

class JwtHelper
{
    private static $secret = 'your-secret-here';
    private static $issuer = 'your-app';
    private static $algorithm = 'HS256';

    public static function generateToken($userId, $role)
    {
        $payload = [
            'iss' => self::$issuer,
            'sub' => $userId,
            'role' => $role,
            'iat' => time(),
            'exp' => time() + (24 * 60 * 60) // 24 hours
        ];

        return JWT::encode($payload, self::$secret, self::$algorithm);
    }

    public static function validateToken($token)
    {
        try {
            $decoded = JWT::decode($token, new Key(self::$secret, self::$algorithm));
            return (array) $decoded;
        } catch (Exception $e) {
            throw new Exception('Invalid token: ' . $e->getMessage());
        }
    }

    public static function refreshToken($token)
    {
        try {
            $decoded = self::validateToken($token);
            
            // Check if token expires in next hour
            if ($decoded['exp'] - time() < 3600) {
                return self::generateToken($decoded['sub'], $decoded['role']);
            }
            
            return $token; // No refresh needed
        } catch (Exception $e) {
            throw new Exception('Cannot refresh token: ' . $e->getMessage());
        }
    }
}

// Laravel Middleware
class JwtMiddleware
{
    public function handle($request, Closure $next)
    {
        $token = $request->bearerToken();
        
        if (!$token) {
            return response()->json(['error' => 'Token not provided'], 401);
        }

        try {
            $decoded = JwtHelper::validateToken($token);
            $request->merge(['user' => $decoded]);
            return $next($request);
        } catch (Exception $e) {
            return response()->json(['error' => 'Unauthorized'], 401);
        }
    }
}