diff --git a/SzCli/Logger.cs b/SzCli/Logger.cs
new file mode 100644
index 0000000..b3523cd
--- /dev/null
+++ b/SzCli/Logger.cs
@@ -0,0 +1,27 @@
+using SzLib;
+
+namespace SzCli;
+
+public class Logger(ISzFileManager fileManager) : ISzLogger
+{
+    public bool LogToFile { get; set; } = true;
+    public string LogFilePath { get; set; } = Path.Combine(fileManager.DataPath, "log.txt");
+
+    public void Log(string text)
+    {
+        Console.WriteLine($"{DateTime.UtcNow} : [SZ LOG] {text}");
+        if (LogToFile) File.AppendAllText(LogFilePath, $"{DateTime.UtcNow} : [SZ LOG] {text}\n");
+    }
+
+    public void LogError(string text)
+    {
+        Console.WriteLine($"{DateTime.UtcNow} : [SZ ERR] {text}");
+        if (LogToFile) File.AppendAllText(LogFilePath, $"{DateTime.UtcNow} : [SZ ERR] {text}\n");
+    }
+
+    public void LogWarning(string text)
+    {
+        Console.WriteLine($"{DateTime.UtcNow} : [SZ WARN] {text}");
+        if (LogToFile) File.AppendAllText(LogFilePath, $"{DateTime.UtcNow} : [SZ WARN] {text}\n");
+    }
+}
\ No newline at end of file
diff --git a/SzCli/Program.cs b/SzCli/Program.cs
index 5e2e612..4a8531e 100644
--- a/SzCli/Program.cs
+++ b/SzCli/Program.cs
@@ -5,22 +5,25 @@ namespace SzCli;
 
 public class Program
 {
+    private static readonly ISzFileManager _fileManager = new LocalFileManager();
+    private static readonly ISzLogger _logger = new Logger(_fileManager);
+    
     public static void Main(string[] args)
     {
-        var parser = new SzParser(new LocalFileManager());
+        var parser = new SzParser(_fileManager, _logger);
 
-        Console.WriteLine("Creating test dataset...");
+        _logger.Log("Creating test dataset...");
         var dataset = Test.CreateTestDataset();
-        Console.WriteLine($"Successfully created test dataset with id {dataset.Id}");
+        _logger.Log($"Successfully created test dataset with id {dataset.Id}");
         
-        Console.WriteLine("Attempting to save dataset...");
+        _logger.Log("Attempting to save dataset...");
         var saved = parser.SaveDataset(dataset);
-        Console.WriteLine($"Successfully saved dataset? {saved}");
+        _logger.Log($"Successfully saved dataset? {saved}");
         
-        Console.WriteLine("Attempting to load dataset...");
+        _logger.Log("Attempting to load dataset...");
         var loadedDataset = parser.LoadDataset(dataset.Id);
-        Console.WriteLine($"Successfully loaded dataset? {loadedDataset != null}. Id is {loadedDataset?.Id}");
+        _logger.Log($"Successfully loaded dataset? {loadedDataset != null}. Id is {loadedDataset?.Id}");
         
-        Console.WriteLine(loadedDataset?.DataObjects["test"].Fields["value"].Value);
+       _logger.Log(loadedDataset?.DataObjects["test"].Fields["value"].Value);
     }
 }
\ No newline at end of file
diff --git a/SzLib/ISzLogger.cs b/SzLib/ISzLogger.cs
new file mode 100644
index 0000000..8d8054a
--- /dev/null
+++ b/SzLib/ISzLogger.cs
@@ -0,0 +1,10 @@
+namespace SzLib;
+
+public interface ISzLogger
+{
+    public bool LogToFile { get; set; }
+    public string LogFilePath { get; set; }
+    public void Log(string text);
+    public void LogError(string text);
+    public void LogWarning(string text);
+}
\ No newline at end of file
diff --git a/SzLib/SzParser.cs b/SzLib/SzParser.cs
index 3745be9..343f75e 100644
--- a/SzLib/SzParser.cs
+++ b/SzLib/SzParser.cs
@@ -3,7 +3,7 @@ using SzLib.DataObjects;
 
 namespace SzLib;
 
-public class SzParser(ISzFileManager szFileManager)
+public class SzParser(ISzFileManager szFileManager, ISzLogger szLogger)
 {
     private readonly JsonSerializerOptions _jsonOptions = new() { WriteIndented = true };
 
@@ -29,7 +29,8 @@ public class SzParser(ISzFileManager szFileManager)
         }
         catch (Exception e)
         {
-            throw new Exception("Could not deserialize JSON to type SzDataset: " + e.Message, e);
+            szLogger.LogError("Could not deserialize JSON to type SzDataset: " + e.Message);
+            return null;
         }
     }
 
@@ -42,7 +43,7 @@ public class SzParser(ISzFileManager szFileManager)
         }
         catch (Exception e)
         {
-            Console.WriteLine("Error saving dataset: " + e.Message);
+            szLogger.LogError("Error saving dataset: " + e.Message);
             return false;
         }
     }