diff --git a/DotTiled.Tests/Serialization/Tmj/TmjMapReaderTests.cs b/DotTiled.Tests/Serialization/Tmj/TmjMapReaderTests.cs
index 2462fcd..7e15bac 100644
--- a/DotTiled.Tests/Serialization/Tmj/TmjMapReaderTests.cs
+++ b/DotTiled.Tests/Serialization/Tmj/TmjMapReaderTests.cs
@@ -14,12 +14,45 @@ public partial class TmjMapReaderTests
       "nextobjectid":1,
       "nextlayerid":1,
       "orientation":"orthogonal",
+      "properties": [
+        {
+          "name":"mapProperty1",
+          "type":"string",
+          "value":"one"
+        },
+        {
+          "name":"mapProperty3",
+          "type":"string",
+          "value":"twoeee"
+        }
+      ],
       "renderorder":"right-down",
       "tileheight":32,
       "tilewidth":32,
       "version":"1",
       "tiledversion":"1.0.3",
-      "width":4
+      "width":4,
+      "tilesets": [
+        {
+          "columns":19,
+          "firstgid":1,
+          "image":"image/fishbaddie_parts.png",
+          "imageheight":480,
+          "imagewidth":640,
+          "margin":3,
+          "name":"",
+          "properties":[
+            {
+              "name":"myProperty1",
+              "type":"string",
+              "value":"myProperty1_value"
+            }],
+          "spacing":1,
+          "tilecount":266,
+          "tileheight":32,
+          "tilewidth":32
+        }
+      ]
     }
     """;
 
diff --git a/DotTiled/Serialization/Tmj/ExtensionsUtf8JsonReader.cs b/DotTiled/Serialization/Tmj/ExtensionsUtf8JsonReader.cs
index a0cd7a6..1c98bc6 100644
--- a/DotTiled/Serialization/Tmj/ExtensionsUtf8JsonReader.cs
+++ b/DotTiled/Serialization/Tmj/ExtensionsUtf8JsonReader.cs
@@ -14,40 +14,26 @@ internal partial class Tmj
     internal string PropertyName { get; } = propertyName;
   }
 
-  internal class RequiredProperty<T>(string propertyName, Action<T> withValue) : JsonProperty(propertyName)
+  internal delegate void UseReader(ref Utf8JsonReader reader);
+
+  internal class RequiredProperty(string propertyName, UseReader useReader) : JsonProperty(propertyName)
   {
-    internal Action<T> WithValue { get; } = withValue;
+    internal UseReader UseReader { get; } = useReader;
   }
 
-  internal class OptionalProperty<T>(string propertyName, Action<T?> withValue, bool allowNull = false) : JsonProperty(propertyName)
+  internal class OptionalProperty(string propertyName, UseReader useReader, bool allowNull = true) : JsonProperty(propertyName)
   {
-    internal Action<T?> WithValue { get; } = withValue;
+    internal UseReader UseReader { get; } = useReader;
     internal bool AllowNull { get; } = allowNull;
   }
 }
 
 internal static class ExtensionsUtf8JsonReader
 {
-  private static bool IsSubclassOfRawGeneric(Type generic, Type toCheck)
+  internal static T Progress<T>(ref this Utf8JsonReader reader, T value)
   {
-    while (toCheck != typeof(object))
-    {
-      var cur = toCheck!.IsGenericType ? toCheck.GetGenericTypeDefinition() : toCheck;
-      if (generic == cur)
-        return true;
-
-      toCheck = toCheck.BaseType!;
-    }
-
-    return false;
-  }
-
-  internal static void Require<T>(this ref Utf8JsonReader reader, ProcessProperty process)
-  {
-    if (reader.TokenType == JsonTokenType.Null)
-      throw new JsonException("Value is required.");
-
-    process(ref reader);
+    reader.Read();
+    return value;
   }
 
   internal static void MoveToContent(this ref Utf8JsonReader reader)
@@ -59,16 +45,15 @@ internal static class ExtensionsUtf8JsonReader
 
   internal delegate void ProcessProperty(ref Utf8JsonReader reader);
 
-  internal static void ProcessJsonObject(this Utf8JsonReader reader, (string PropertyName, ProcessProperty Processor)[] processors)
+  private static void ProcessJsonObject(this ref Utf8JsonReader reader, (string PropertyName, ProcessProperty Processor)[] processors)
   {
     if (reader.TokenType != JsonTokenType.StartObject)
       throw new JsonException("Expected start of object.");
 
-    while (reader.Read())
-    {
-      if (reader.TokenType == JsonTokenType.EndObject)
-        return;
+    reader.Read();
 
+    while (reader.TokenType != JsonTokenType.EndObject)
+    {
       if (reader.TokenType != JsonTokenType.PropertyName)
         throw new JsonException("Expected property name.");
 
@@ -77,7 +62,11 @@ internal static class ExtensionsUtf8JsonReader
 
       if (!processors.Any(x => x.PropertyName == propertyName))
       {
-        reader.Skip();
+        var depthBefore = reader.CurrentDepth;
+
+        while (reader.TokenType != JsonTokenType.PropertyName || reader.CurrentDepth > depthBefore)
+          reader.Read();
+
         continue;
       }
 
@@ -85,74 +74,66 @@ internal static class ExtensionsUtf8JsonReader
       processor(ref reader);
     }
 
-    throw new JsonException("Expected end of object.");
+    if (reader.TokenType != JsonTokenType.EndObject)
+      throw new JsonException("Expected end of object.");
+
+    reader.Read();
   }
 
-  delegate T UseReader<T>(ref Utf8JsonReader reader);
-
-  internal static void ProcessJsonObject(this Utf8JsonReader reader, Tmj.JsonProperty[] properties)
+  internal static void ProcessJsonObject(this ref Utf8JsonReader reader, Tmj.JsonProperty[] properties, string objectTypeName)
   {
     List<string> processedProperties = [];
 
-    bool CheckType<T>(ref Utf8JsonReader reader, Tmj.JsonProperty prop, UseReader<T?> useReader)
+    ProcessJsonObject(ref reader, properties.Select<Tmj.JsonProperty, (string, ProcessProperty)>(x => (x.PropertyName, (ref Utf8JsonReader reader) =>
     {
-      return CheckRequire<T>(ref reader, prop, (ref Utf8JsonReader r) => useReader(ref r)!) || CheckOptional<T>(ref reader, prop, useReader);
-    }
+      if (processedProperties.Contains(x.PropertyName))
+        throw new JsonException($"Property '{x.PropertyName}' was already processed.");
 
-    bool CheckRequire<T>(ref Utf8JsonReader reader, Tmj.JsonProperty prop, UseReader<T> useReader)
-    {
-      if (prop is Tmj.RequiredProperty<T> requiredProp)
+      processedProperties.Add(x.PropertyName);
+
+      if (x is Tmj.RequiredProperty req)
       {
-        reader.Require<string>((ref Utf8JsonReader r) =>
-        {
-          requiredProp.WithValue(useReader(ref r));
-        });
-        return true;
-      }
-      return false;
-    }
+        if (reader.TokenType == JsonTokenType.Null)
+          throw new JsonException($"Required property '{req.PropertyName}' cannot be null when reading {objectTypeName}.");
 
-    bool CheckOptional<T>(ref Utf8JsonReader reader, Tmj.JsonProperty prop, UseReader<T?> useReader)
-    {
-      if (prop is Tmj.OptionalProperty<T> optionalProp)
+        req.UseReader(ref reader);
+      }
+      else if (x is Tmj.OptionalProperty opt)
       {
-        if (reader.TokenType == JsonTokenType.Null && !optionalProp.AllowNull)
-          throw new JsonException("Value cannot be null for optional property.");
-        else if (reader.TokenType == JsonTokenType.Null && optionalProp.AllowNull)
-          optionalProp.WithValue(default);
-        else
-          optionalProp.WithValue(useReader(ref reader));
-        return true;
+        if (reader.TokenType == JsonTokenType.Null && !opt.AllowNull)
+          throw new JsonException($"Value cannot be null for optional property '{opt.PropertyName}' when reading {objectTypeName}.");
+        else if (reader.TokenType == JsonTokenType.Null && opt.AllowNull)
+          return;
+
+        opt.UseReader(ref reader);
       }
-      return false;
-    }
-
-    ProcessJsonObject(reader, properties.Select<Tmj.JsonProperty, (string, ProcessProperty)>(x => (x.PropertyName.ToLowerInvariant(), (ref Utf8JsonReader reader) =>
-    {
-      var lowerInvariant = x.PropertyName.ToLowerInvariant();
-
-      if (processedProperties.Contains(lowerInvariant))
-        throw new JsonException($"Property '{lowerInvariant}' was already processed.");
-
-      processedProperties.Add(lowerInvariant);
-
-      if (CheckType<string>(ref reader, x, (ref Utf8JsonReader r) => r.GetString()!))
-        return;
-      if (CheckType<int>(ref reader, x, (ref Utf8JsonReader r) => r.GetInt32()))
-        return;
-      if (CheckType<uint>(ref reader, x, (ref Utf8JsonReader r) => r.GetUInt32()))
-        return;
-      if (CheckType<float>(ref reader, x, (ref Utf8JsonReader r) => r.GetSingle()))
-        return;
-
-      throw new NotSupportedException($"Unsupported property type '{x.GetType().GenericTypeArguments.First()}'.");
     }
     )).ToArray());
 
     foreach (var property in properties)
     {
-      if (IsSubclassOfRawGeneric(typeof(Tmj.RequiredProperty<>), property.GetType()) && !processedProperties.Contains(property.PropertyName.ToLowerInvariant()))
-        throw new JsonException($"Required property '{property.PropertyName}' was not found.");
+      if (property is Tmj.RequiredProperty && !processedProperties.Contains(property.PropertyName))
+        throw new JsonException($"Required property '{property.PropertyName}' was not found when reading {objectTypeName}.");
     }
   }
+
+  internal delegate void UseReader(ref Utf8JsonReader reader);
+
+  internal static void ProcessJsonArray(this ref Utf8JsonReader reader, UseReader useReader)
+  {
+    if (reader.TokenType != JsonTokenType.StartArray)
+      throw new JsonException("Expected start of array.");
+
+    reader.Read();
+
+    while (reader.TokenType != JsonTokenType.EndArray)
+    {
+      useReader(ref reader);
+    }
+
+    if (reader.TokenType != JsonTokenType.EndArray)
+      throw new JsonException("Expected end of array.");
+
+    reader.Read();
+  }
 }
diff --git a/DotTiled/Serialization/Tmj/Tmj.Map.cs b/DotTiled/Serialization/Tmj/Tmj.Map.cs
index ce3ab2a..c76c391 100644
--- a/DotTiled/Serialization/Tmj/Tmj.Map.cs
+++ b/DotTiled/Serialization/Tmj/Tmj.Map.cs
@@ -1,4 +1,6 @@
+using System.Collections.Generic;
 using System.Globalization;
+using System.IO;
 using System.Text.Json;
 
 namespace DotTiled;
@@ -27,11 +29,18 @@ internal partial class Tmj
     uint nextObjectID = 0;
     bool infinite = false;
 
+    // At most one of
+    Dictionary<string, IProperty>? properties = null;
+
+    // Any number of
+    List<BaseLayer> layers = [];
+    List<Tileset> tilesets = [];
+
     reader.ProcessJsonObject([
-      new RequiredProperty<string>("version", value => version = value),
-      new RequiredProperty<string>("tiledVersion", value => tiledVersion = value),
-      new OptionalProperty<string>("class", value => @class = value ?? ""),
-      new RequiredProperty<string>("orientation", value => orientation = value switch
+      new RequiredProperty("version", (ref Utf8JsonReader reader) => version = reader.Progress(reader.GetString()!)),
+      new RequiredProperty("tiledversion", (ref Utf8JsonReader reader) => tiledVersion = reader.Progress(reader.GetString()!)),
+      new OptionalProperty("class", (ref Utf8JsonReader reader) => @class = reader.Progress(reader.GetString() ?? ""), allowNull: true),
+      new RequiredProperty("orientation", (ref Utf8JsonReader reader) => orientation = reader.Progress(reader.GetString()) switch
       {
         "orthogonal" => MapOrientation.Orthogonal,
         "isometric" => MapOrientation.Isometric,
@@ -39,7 +48,7 @@ internal partial class Tmj
         "hexagonal" => MapOrientation.Hexagonal,
         _ => throw new JsonException("Invalid orientation.")
       }),
-      new OptionalProperty<string>("renderOrder", value => renderOrder = value switch
+      new OptionalProperty("renderorder", (ref Utf8JsonReader reader) => renderOrder = reader.Progress(reader.GetString()) switch
       {
         "right-down" => RenderOrder.RightDown,
         "right-up" => RenderOrder.RightUp,
@@ -47,31 +56,34 @@ internal partial class Tmj
         "left-up" => RenderOrder.LeftUp,
         _ => throw new JsonException("Invalid render order.")
       }),
-      new OptionalProperty<int>("compressionLevel", value => compressionLevel = value),
-      new RequiredProperty<uint>("width", value => width = value),
-      new RequiredProperty<uint>("height", value => height = value),
-      new RequiredProperty<uint>("tileWidth", value => tileWidth = value),
-      new RequiredProperty<uint>("tileHeight", value => tileHeight = value),
-      new OptionalProperty<uint>("hexSideLength", value => hexSideLength = value),
-      new OptionalProperty<string>("staggerAxis", value => staggerAxis = value switch
+      new OptionalProperty("compressionlevel", (ref Utf8JsonReader reader) => compressionLevel = reader.Progress(reader.GetInt32())),
+      new RequiredProperty("width", (ref Utf8JsonReader reader) => width = reader.Progress(reader.GetUInt32())),
+      new RequiredProperty("height", (ref Utf8JsonReader reader) => height = reader.Progress(reader.GetUInt32())),
+      new RequiredProperty("tilewidth", (ref Utf8JsonReader reader) => tileWidth = reader.Progress(reader.GetUInt32())),
+      new RequiredProperty("tileheight", (ref Utf8JsonReader reader) => tileHeight = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("hexsidelength", (ref Utf8JsonReader reader) => hexSideLength = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("staggeraxis", (ref Utf8JsonReader reader) => staggerAxis = reader.Progress(reader.GetString()) switch
       {
         "x" => StaggerAxis.X,
         "y" => StaggerAxis.Y,
         _ => throw new JsonException("Invalid stagger axis.")
       }),
-      new OptionalProperty<string>("staggerIndex", value => staggerIndex = value switch
+      new OptionalProperty("staggerindex", (ref Utf8JsonReader reader) => staggerIndex = reader.Progress(reader.GetString()) switch
       {
         "odd" => StaggerIndex.Odd,
         "even" => StaggerIndex.Even,
         _ => throw new JsonException("Invalid stagger index.")
       }),
-      new OptionalProperty<float>("parallaxOriginX", value => parallaxOriginX = value),
-      new OptionalProperty<float>("parallaxOriginY", value => parallaxOriginY = value),
-      new OptionalProperty<string>("backgroundColor", value => backgroundColor = Color.Parse(value!, CultureInfo.InvariantCulture)),
-      new RequiredProperty<uint>("nextLayerID", value => nextLayerID = value),
-      new RequiredProperty<uint>("nextObjectID", value => nextObjectID = value),
-      new OptionalProperty<uint>("infinite", value => infinite = value == 1)
-    ]);
+      new OptionalProperty("parallaxoriginx", (ref Utf8JsonReader reader) => parallaxOriginX = reader.Progress(reader.GetSingle())),
+      new OptionalProperty("parallaxoriginy", (ref Utf8JsonReader reader) => parallaxOriginY = reader.Progress(reader.GetSingle())),
+      new OptionalProperty("backgroundcolor", (ref Utf8JsonReader reader) => backgroundColor = Color.Parse(reader.Progress(reader.GetString()!), CultureInfo.InvariantCulture)),
+      new RequiredProperty("nextlayerid", (ref Utf8JsonReader reader) => nextLayerID = reader.Progress(reader.GetUInt32())),
+      new RequiredProperty("nextobjectid", (ref Utf8JsonReader reader) => nextObjectID = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("infinite", (ref Utf8JsonReader reader) => infinite = reader.Progress(reader.GetUInt32()) == 1),
+
+      new OptionalProperty("properties", (ref Utf8JsonReader reader) => properties = ReadProperties(ref reader)),
+      new OptionalProperty("tilesets", (ref Utf8JsonReader reader) => tilesets = ReadTilesets(ref reader))
+    ], "map");
 
     return new Map
     {
@@ -94,9 +106,174 @@ internal partial class Tmj
       NextLayerID = nextLayerID,
       NextObjectID = nextObjectID,
       Infinite = infinite,
-      //Properties = properties,
-      //Tilesets = tilesets,
-      //Layers = layers
+      Properties = properties,
+      Tilesets = tilesets,
+      Layers = layers
+    };
+  }
+
+  internal static Dictionary<string, IProperty> ReadProperties(ref Utf8JsonReader reader)
+  {
+    var properties = new Dictionary<string, IProperty>();
+
+    reader.ProcessJsonArray((ref Utf8JsonReader reader) =>
+    {
+      var property = ReadProperty(ref reader);
+      properties.Add(property.Name, property);
+    });
+
+    return properties;
+  }
+
+  internal static IProperty ReadProperty(ref Utf8JsonReader reader)
+  {
+    string name = default!;
+    string type = default!;
+    IProperty property = null;
+
+    reader.ProcessJsonObject([
+      new RequiredProperty("name", (ref Utf8JsonReader reader) => name = reader.Progress(reader.GetString()!)),
+      new RequiredProperty("type", (ref Utf8JsonReader reader) => type = reader.Progress(reader.GetString()!)),
+      new RequiredProperty("value", (ref Utf8JsonReader reader) =>
+      {
+        property = type switch
+        {
+          "string" => new StringProperty { Name = name, Value = reader.Progress(reader.GetString()!) },
+          "int" => new IntProperty { Name = name, Value = reader.Progress(reader.GetInt32()) },
+          "float" => new FloatProperty { Name = name, Value = reader.Progress(reader.GetSingle()) },
+          "bool" => new BoolProperty { Name = name, Value = reader.Progress(reader.GetBoolean()) },
+          "color" => new ColorProperty { Name = name, Value = Color.Parse(reader.Progress(reader.GetString()!), CultureInfo.InvariantCulture) },
+          "file" => new FileProperty { Name = name, Value = reader.Progress(reader.GetString()!) },
+          "object" => new ObjectProperty { Name = name, Value = reader.Progress(reader.GetUInt32()) },
+          // "class" => ReadClassProperty(ref reader),
+          _ => throw new JsonException("Invalid property type.")
+        };
+      }),
+    ], "property");
+
+    return property!;
+  }
+
+  internal static List<Tileset> ReadTilesets(ref Utf8JsonReader reader)
+  {
+    var tilesets = new List<Tileset>();
+
+    reader.ProcessJsonArray((ref Utf8JsonReader reader) =>
+    {
+      var tileset = ReadTileset(ref reader);
+      tilesets.Add(tileset);
+    });
+
+    return tilesets;
+  }
+
+  internal static Tileset ReadTileset(ref Utf8JsonReader reader)
+  {
+    string? version = null;
+    string? tiledVersion = null;
+    uint? firstGID = null;
+    string? source = null;
+    string? name = null;
+    string @class = "";
+    uint? tileWidth = null;
+    uint? tileHeight = null;
+    uint? spacing = null;
+    uint? margin = null;
+    uint? tileCount = null;
+    uint? columns = null;
+    ObjectAlignment objectAlignment = ObjectAlignment.Unspecified;
+    FillMode fillMode = FillMode.Stretch;
+
+    string? image = null;
+    uint? imageWidth = null;
+    uint? imageHeight = null;
+
+    Dictionary<string, IProperty>? properties = null;
+
+    reader.ProcessJsonObject([
+      new OptionalProperty("version", (ref Utf8JsonReader reader) => version = reader.Progress(reader.GetString())),
+      new OptionalProperty("tiledversion", (ref Utf8JsonReader reader) => tiledVersion = reader.Progress(reader.GetString())),
+      new OptionalProperty("firstgid", (ref Utf8JsonReader reader) => firstGID = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("source", (ref Utf8JsonReader reader) => source = reader.Progress(reader.GetString())),
+      new OptionalProperty("name", (ref Utf8JsonReader reader) => name = reader.Progress(reader.GetString())),
+      new OptionalProperty("class", (ref Utf8JsonReader reader) => @class = reader.Progress(reader.GetString() ?? ""), allowNull: true),
+      new OptionalProperty("tilewidth", (ref Utf8JsonReader reader) => tileWidth = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("tileheight", (ref Utf8JsonReader reader) => tileHeight = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("spacing", (ref Utf8JsonReader reader) => spacing = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("margin", (ref Utf8JsonReader reader) => margin = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("tilecount", (ref Utf8JsonReader reader) => tileCount = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("columns", (ref Utf8JsonReader reader) => columns = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("objectalignment", (ref Utf8JsonReader reader) => objectAlignment = reader.Progress(reader.GetString()) switch
+      {
+        "unspecified" => ObjectAlignment.Unspecified,
+        "topleft" => ObjectAlignment.TopLeft,
+        "top" => ObjectAlignment.Top,
+        "topright" => ObjectAlignment.TopRight,
+        "left" => ObjectAlignment.Left,
+        "center" => ObjectAlignment.Center,
+        "right" => ObjectAlignment.Right,
+        "bottomleft" => ObjectAlignment.BottomLeft,
+        "bottom" => ObjectAlignment.Bottom,
+        "bottomright" => ObjectAlignment.BottomRight,
+        _ => throw new JsonException("Invalid object alignment.")
+      }),
+      new OptionalProperty("fillmode", (ref Utf8JsonReader reader) => fillMode = reader.Progress(reader.GetString()) switch
+      {
+        "stretch" => FillMode.Stretch,
+        "preserve-aspect-fit" => FillMode.PreserveAspectFit,
+        _ => throw new JsonException("Invalid fill mode.")
+      }),
+
+      new OptionalProperty("image", (ref Utf8JsonReader reader) => image = reader.Progress(reader.GetString())),
+      new OptionalProperty("imagewidth", (ref Utf8JsonReader reader) => imageWidth = reader.Progress(reader.GetUInt32())),
+      new OptionalProperty("imageheight", (ref Utf8JsonReader reader) => imageHeight = reader.Progress(reader.GetUInt32())),
+
+      new OptionalProperty("properties", (ref Utf8JsonReader reader) => properties = ReadProperties(ref reader))
+    ], "tileset");
+
+    Image? imageInstance = image is not null ? new Image
+    {
+      Format = ParseImageFormatFromSource(image),
+      Width = imageWidth,
+      Height = imageHeight,
+      Source = image
+    } : null;
+
+    return new Tileset
+    {
+      Version = version,
+      TiledVersion = tiledVersion,
+      FirstGID = firstGID,
+      Source = source,
+      Name = name,
+      Class = @class,
+      TileWidth = tileWidth,
+      TileHeight = tileHeight,
+      Spacing = spacing,
+      Margin = margin,
+      TileCount = tileCount,
+      Columns = columns,
+      ObjectAlignment = objectAlignment,
+      FillMode = fillMode,
+      Image = imageInstance,
+      Properties = properties
+    };
+  }
+
+  private static ImageFormat ParseImageFormatFromSource(string? source)
+  {
+    if (source is null)
+      throw new JsonException("Image source is required to determine image format.");
+
+    var extension = Path.GetExtension(source);
+    return extension switch
+    {
+      ".png" => ImageFormat.Png,
+      ".jpg" => ImageFormat.Jpg,
+      ".jpeg" => ImageFormat.Jpg,
+      ".gif" => ImageFormat.Gif,
+      ".bmp" => ImageFormat.Bmp,
+      _ => throw new JsonException("Invalid image format.")
     };
   }
 }