Index: ChapterX.Infrastructure/Services/JwtTokenService.cs
===================================================================
--- ChapterX.Infrastructure/Services/JwtTokenService.cs	(revision e294f7d2cedd462a923c69ae9f85c996b5377c69)
+++ ChapterX.Infrastructure/Services/JwtTokenService.cs	(revision e294f7d2cedd462a923c69ae9f85c996b5377c69)
@@ -0,0 +1,44 @@
+using ChapterX.Application.Auth;
+using ChapterX.Domain.Entities;
+using Microsoft.Extensions.Configuration;
+using Microsoft.IdentityModel.Tokens;
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+
+namespace ChapterX.Infrastructure.Services
+{
+    public class JwtTokenService : IJwtTokenService
+    {
+        private readonly IConfiguration _configuration;
+
+        public JwtTokenService(IConfiguration configuration)
+        {
+            _configuration = configuration;
+        }
+
+        public string GenerateToken(User user)
+        {
+            var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_configuration["Jwt:Key"]!));
+            var credentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
+
+            var claims = new[]
+            {
+                new Claim(JwtRegisteredClaimNames.Sub, user.Id.ToString()),
+                new Claim(JwtRegisteredClaimNames.Email, user.Email),
+                new Claim(JwtRegisteredClaimNames.UniqueName, user.Username),
+                new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
+            };
+
+            var token = new JwtSecurityToken(
+                issuer: _configuration["Jwt:Issuer"],
+                audience: _configuration["Jwt:Audience"],
+                claims: claims,
+                expires: DateTime.UtcNow.AddDays(7),
+                signingCredentials: credentials
+            );
+
+            return new JwtSecurityTokenHandler().WriteToken(token);
+        }
+    }
+}