diff --git a/srcs/EscapedString.cpp b/srcs/EscapedString.cpp
new file mode 100644
index 00000000..4253d323
--- /dev/null
+++ b/srcs/EscapedString.cpp
@@ -0,0 +1,45 @@
+/*
+ * Arduino JSON library
+ * Benoit Blanchon 2014 - MIT License
+ */
+
+#include "EscapedString.h"
+
+using namespace ArduinoJson::Internals;
+
+static inline char getSpecialChar(char c)
+{
+    // Optimized for code size on a 8-bit AVR
+
+    const char* p = "\"\"\\\\\bb\ff\nn\rr\tt\0";
+
+    while (p[0] && p[0] != c)
+    {
+        p += 2;
+    }
+
+    return p[1];
+}
+
+static inline size_t printCharTo(char c, Print& p)
+{
+    char specialChar = getSpecialChar(c);
+
+    return specialChar != 0
+        ? p.write('\\') + p.write(specialChar)
+        : p.write(c);
+}
+
+size_t EscapedString::printTo(const char* s, Print& p)
+{
+    if (!s) return p.print("null");
+    
+    size_t n = p.write('\"');
+
+    while (*s)
+    {
+        n += printCharTo(*s++, p);
+    }
+
+    return n + p.write('\"');
+}
\ No newline at end of file
diff --git a/srcs/EscapedString.h b/srcs/EscapedString.h
new file mode 100644
index 00000000..22db62c7
--- /dev/null
+++ b/srcs/EscapedString.h
@@ -0,0 +1,20 @@
+/*
+ * Arduino JSON library
+ * Benoit Blanchon 2014 - MIT License
+ */
+
+#pragma once
+
+#include "Print.h"
+
+namespace ArduinoJson
+{
+    namespace Internals
+    {
+        class EscapedString
+        {
+        public:
+            static size_t printTo(const char*, Print&);
+        };
+    }
+}
\ No newline at end of file
diff --git a/srcs/JsonObject.cpp b/srcs/JsonObject.cpp
index cb319791..ee323c70 100644
--- a/srcs/JsonObject.cpp
+++ b/srcs/JsonObject.cpp
@@ -2,6 +2,7 @@
 
 #include <string.h> // for strcmp
 
+#include "EscapedString.h"
 #include "JsonBuffer.h"
 #include "JsonValue.h"
 #include "JsonNode.h"
@@ -75,5 +76,28 @@ size_t JsonObject::printTo(char* buffer, size_t bufferSize) const
 
 size_t JsonObject::printTo(Print& p) const
 {
-    return p.print("{}");
+    size_t n = 0;
+
+    n += p.write('{');
+
+    JsonNode* firstChild = _node->content.asObject.child;
+
+    for (JsonNode* child = firstChild; child; child = child->next)
+    {
+        const char* childKey = child->content.asKey.key;
+        const char* childValue = child->content.asKey.value->content.asString;
+
+        n += EscapedString::printTo(childKey, p);
+        n += p.write(':');
+        n += EscapedString::printTo(childValue, p);
+
+        if (child->next)
+        {
+            n += p.write(',');
+        }
+    }
+
+    n += p.write('}');
+
+    return n;
 }
\ No newline at end of file
diff --git a/srcs/srcs.vcxproj b/srcs/srcs.vcxproj
index ce0737ca..b1ef050a 100644
--- a/srcs/srcs.vcxproj
+++ b/srcs/srcs.vcxproj
@@ -67,6 +67,7 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClInclude Include="EscapedString.h" />
     <ClInclude Include="JsonBuffer.h" />
     <ClInclude Include="JsonNode.h" />
     <ClInclude Include="JsonObject.h" />
@@ -77,6 +78,7 @@
     <ClInclude Include="StringBuilder.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="EscapedString.cpp" />
     <ClCompile Include="JsonBuffer.cpp" />
     <ClCompile Include="JsonObject.cpp" />
     <ClCompile Include="JsonValue.cpp" />
diff --git a/srcs/srcs.vcxproj.filters b/srcs/srcs.vcxproj.filters
index 79073f13..0940e460 100644
--- a/srcs/srcs.vcxproj.filters
+++ b/srcs/srcs.vcxproj.filters
@@ -39,6 +39,9 @@
     <ClInclude Include="Printable.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="EscapedString.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="JsonObject.cpp">
@@ -56,5 +59,8 @@
     <ClCompile Include="Print.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="EscapedString.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/tests/JsonObjectSerializationTests.cpp b/tests/JsonObjectSerializationTests.cpp
index 4c7bcdec..000029fd 100644
--- a/tests/JsonObjectSerializationTests.cpp
+++ b/tests/JsonObjectSerializationTests.cpp
@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 #include <JsonObject.h>
+#include <JsonValue.h>
 #include <StaticJsonBuffer.h>
 
 class JsonObjectSerializationTests : public testing::Test
@@ -10,7 +11,7 @@ protected:
         object = json.createObject();
     }
 
-    void jsonMustBe(const char* expected)
+    void outputMustBe(const char* expected)
     {        
         char actual[256];
         int result = object.printTo(actual, sizeof(actual));
@@ -27,5 +28,118 @@ private:
 
 TEST_F(JsonObjectSerializationTests, EmptyObject)
 {
-    jsonMustBe("{}");
-}
\ No newline at end of file
+    outputMustBe("{}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneString)
+{
+    object["key"] = "value";
+
+    outputMustBe("{\"key\":\"value\"}");
+}
+
+TEST_F(JsonObjectSerializationTests, TwoStrings)
+{
+    object["key1"] = "value1";
+    object["key2"] = "value2";
+
+    outputMustBe("{\"key1\":\"value1\",\"key2\":\"value2\"}");
+}
+/*
+TEST_F(JsonObjectSerializationTests, RemoveFirst)
+{
+    object["key1"] = "value1";
+    object["key2"] = "value2";
+    object.remove("key1");
+
+    outputMustBe("{\"key2\":\"value2\"}");
+}
+
+TEST_F(JsonObjectSerializationTests, RemoveLast)
+{
+    object["key1"] = "value1";
+    object["key2"] = "value2";
+    object.remove("key2");
+
+    outputMustBe("{\"key1\":\"value1\"}");
+}
+
+TEST_F(JsonObjectSerializationTests, RemoveUnexistingKey)
+{
+    object["key1"] = "value1";
+    object["key2"] = "value2";
+    object.remove("key3");
+
+    outputMustBe("{\"key1\":\"value1\",\"key2\":\"value2\"}");
+}
+
+TEST_F(JsonObjectSerializationTests, ReplaceExistingKey)
+{
+    object["key"] = "value1";
+    object["key"] = "value2";
+
+    outputMustBe("{\"key\":\"value2\"}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneStringOverCapacity)
+{
+    object["key1"] = "value1";
+    object["key2"] = "value2";
+    object["key3"] = "value3";
+
+    outputMustBe("{\"key1\":\"value1\",\"key2\":\"value2\"}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneInteger)
+{
+    object["key"] = 1;
+    outputMustBe("{\"key\":1}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneDoubleFourDigits)
+{
+    object["key"].set<4>(3.14159265358979323846);
+    outputMustBe("{\"key\":3.1416}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneDoubleDefaultDigits)
+{
+    object["key"] = 3.14159265358979323846;
+    outputMustBe("{\"key\":3.14}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneNull)
+{
+    object["key"] = (char*) 0;
+    outputMustBe("{\"key\":null}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneTrue)
+{
+    object["key"] = true;
+    outputMustBe("{\"key\":true}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneFalse)
+{
+    object["key"] = false;
+    outputMustBe("{\"key\":false}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneEmptyNestedArray)
+{
+    auto nestedArray = JsonArray<1>();
+
+    object["key"] = nestedArray;
+
+    outputMustBe("{\"key\":[]}");
+}
+
+TEST_F(JsonObjectSerializationTests, OneEmptyNestedObject)
+{
+    auto nestedObject = JsonObject<1>();
+
+    object["key"] = nestedObject;
+
+    outputMustBe("{\"key\":{}}");
+}*/
\ No newline at end of file