diff --git a/WorkFlow.API/Program.cs b/WorkFlow.API/Program.cs
index 3f4af42..adcadf5 100644
--- a/WorkFlow.API/Program.cs
+++ b/WorkFlow.API/Program.cs
@@ -8,58 +8,74 @@ using DigitalData.Core.Application;
 using DigitalData.UserManager.Application.DTOs.User;
 using Microsoft.IdentityModel.Tokens;
 using WorkFlow.API.Models;
-using System.Security.Claims;
+using NLog;
+using NLog.Web;
 
-var builder = WebApplication.CreateBuilder(args);
-var config = builder.Configuration;
+var logger = LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
+logger.Info("Logging initialized.");
 
-// Add services to the container.
-var cnn_str = config.GetConnectionString("Default") ?? throw new ("Default connection string not found.");
-builder.Services.AddDbContext<WFDBContext>(options => options.UseSqlServer(cnn_str).EnableDetailedErrors());
-builder.Services.AddWorkFlow().AddUserManager<WFDBContext>();
-builder.Services.AddCookieBasedLocalizer();
-builder.ConfigureBySection<DirectorySearchOptions>();
-builder.Services.AddDirectorySearchService();
-builder.Services.AddJWTService<UserReadDto>(user => new SecurityTokenDescriptor()
+try
 {
-    Claims = user.ToClaimList().ToDictionary(claim => claim.Type, claim => claim.Value as object)
-});
+    var builder = WebApplication.CreateBuilder(args);
+    var config = builder.Configuration;
 
-builder.Services.AddControllers();
+    // Add NLogger
+    builder.Logging.ClearProviders();
+    builder.Host.UseNLog();
 
-builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
-    .AddCookie(options =>
+    // Add services to the container.
+    var cnn_str = config.GetConnectionString("Default") ?? throw new("Default connection string not found.");
+    builder.Services.AddDbContext<WFDBContext>(options => options.UseSqlServer(cnn_str).EnableDetailedErrors());
+    builder.Services.AddWorkFlow().AddUserManager<WFDBContext>();
+    builder.Services.AddCookieBasedLocalizer();
+    builder.ConfigureBySection<DirectorySearchOptions>();
+    builder.Services.AddDirectorySearchService();
+    builder.Services.AddJWTService<UserReadDto>(user => new SecurityTokenDescriptor()
     {
-        options.Cookie.HttpOnly = true;  // Makes the cookie inaccessible to client-side scripts for security
-        options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest; // Ensures cookies are sent over HTTPS only
-        options.Cookie.SameSite = SameSiteMode.Strict; // Protects against CSRF attacks by restricting how cookies are sent with requests from external sites
-        options.LoginPath = "/api/auth/login";
-        options.LogoutPath = "/api/auth/logout";
-        options.ExpireTimeSpan = TimeSpan.FromMinutes(60); // timeout.
-        options.SlidingExpiration = true; //refreshes the expiration time on each request.
-        options.Cookie.Name = "AuthSession";
+        Claims = user.ToClaimList().ToDictionary(claim => claim.Type, claim => claim.Value as object)
     });
 
-builder.Services.AddEndpointsApiExplorer();
-builder.Services.AddSwaggerGen();
+    builder.Services.AddControllers();
 
-var app = builder.Build();
+    builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
+        .AddCookie(options =>
+        {
+            options.Cookie.HttpOnly = true;  // Makes the cookie inaccessible to client-side scripts for security
+            options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest; // Ensures cookies are sent over HTTPS only
+            options.Cookie.SameSite = SameSiteMode.Strict; // Protects against CSRF attacks by restricting how cookies are sent with requests from external sites
+            options.LoginPath = "/api/auth/login";
+            options.LogoutPath = "/api/auth/logout";
+            options.ExpireTimeSpan = TimeSpan.FromMinutes(60); // timeout.
+            options.SlidingExpiration = true; //refreshes the expiration time on each request.
+            options.Cookie.Name = "AuthSession";
+        });
 
-// Configure the HTTP request pipeline.
-if (app.IsDevOrDiP() && app.Configuration.GetValue<bool>("EnableSwagger"))
-{
-    app.UseSwagger();
-    app.UseSwaggerUI();
+    builder.Services.AddEndpointsApiExplorer();
+    builder.Services.AddSwaggerGen();
+
+    var app = builder.Build();
+
+    // Configure the HTTP request pipeline.
+    if (app.IsDevOrDiP() && app.Configuration.GetValue<bool>("EnableSwagger"))
+    {
+        app.UseSwagger();
+        app.UseSwaggerUI();
+    }
+
+    app.UseHttpsRedirection();
+
+    app.UseAuthentication();
+
+    app.UseAuthorization();
+
+    app.UseCookieBasedLocalizer("de-DE");
+
+    app.MapControllers();
+
+    app.Run();
 }
-
-app.UseHttpsRedirection();
-
-app.UseAuthentication();
-
-app.UseAuthorization();
-
-app.UseCookieBasedLocalizer("de-DE");
-
-app.MapControllers();
-
-app.Run();
\ No newline at end of file
+catch (Exception ex)
+{
+    logger.Error(ex, "Stopped program because of exception.");
+    throw;
+}
\ No newline at end of file
diff --git a/WorkFlow.API/WorkFlow.API.csproj b/WorkFlow.API/WorkFlow.API.csproj
index f3987f2..047781d 100644
--- a/WorkFlow.API/WorkFlow.API.csproj
+++ b/WorkFlow.API/WorkFlow.API.csproj
@@ -8,6 +8,8 @@
 
   <ItemGroup>
     <PackageReference Include="DigitalData.Core.API" Version="2.0.0" />
+    <PackageReference Include="NLog" Version="5.3.4" />
+    <PackageReference Include="NLog.Web.AspNetCore" Version="5.3.14" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
   </ItemGroup>
 
diff --git a/WorkFlow.API/appsettings.json b/WorkFlow.API/appsettings.json
index 89037e4..28ebabd 100644
--- a/WorkFlow.API/appsettings.json
+++ b/WorkFlow.API/appsettings.json
@@ -7,6 +7,49 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
+  "NLog": {
+    "throwConfigExceptions": true,
+    "variables": {
+      "logDirectory": "E:\\LogFiles\\Digital Data\\workFlow",
+      "logFileNamePrefix": "${shortdate}-ECM.EnvelopeGenerator.Web"
+    },
+    "targets": {
+      "infoLogs": {
+        "type": "File",
+        "fileName": "${logDirectory}\\${logFileNamePrefix}-Info.log",
+        "maxArchiveDays": 30
+      },
+      "errorLogs": {
+        "type": "File",
+        "fileName": "${logDirectory}\\${logFileNamePrefix}-Error.log",
+        "maxArchiveDays": 30
+      },
+      "criticalLogs": {
+        "type": "File",
+        "fileName": "${logDirectory}\\${logFileNamePrefix}-Critical.log",
+        "maxArchiveDays": 30
+      }
+    },
+    // Trace, Debug, Info, Warn, Error and *Fatal*
+    "rules": [
+      {
+        "logger": "*",
+        "minLevel": "Info",
+        "maxLevel": "Warn",
+        "writeTo": "infoLogs"
+      },
+      {
+        "logger": "*",
+        "level": "Error",
+        "writeTo": "errorLogs"
+      },
+      {
+        "logger": "*",
+        "level": "Fatal",
+        "writeTo": "criticalLogs"
+      }
+    ]
+  },
   "AllowedHosts": "*",
   "ConnectionStrings": {
     "Default": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM;User Id=sa;Password=dd;Encrypt=false;TrustServerCertificate=True;"