diff --git a/include/msgpack/object.hpp b/include/msgpack/object.hpp
index 2bcccc22..03dd8689 100644
--- a/include/msgpack/object.hpp
+++ b/include/msgpack/object.hpp
@@ -583,7 +583,40 @@ inline std::ostream& operator<< (std::ostream& s, const msgpack::object& o)
         break;
 
     case msgpack::type::STR:
-        (s << '"').write(o.via.str.ptr, o.via.str.size) << '"';
+        s << '"';
+        for (uint32_t i = 0; i < o.via.str.size; ++i) {
+            char c = o.via.str.ptr[i];
+            switch (c) {
+            case '\\':
+                s << "\\\\";
+                break;
+            case '"':
+                s << "\\\"";
+                break;
+            case '/':
+                s << "\\/";
+                break;
+            case '\b':
+                s << "\\b";
+                break;
+            case '\f':
+                s << "\\f";
+                break;
+            case '\n':
+                s << "\\n";
+                break;
+            case '\r':
+                s << "\\r";
+                break;
+            case '\t':
+                s << "\\t";
+                break;
+            default:
+                s << c;
+                break;
+            }
+        }
+        s << '"';
         break;
 
     case msgpack::type::BIN:
@@ -612,11 +645,11 @@ inline std::ostream& operator<< (std::ostream& s, const msgpack::object& o)
         s << "{";
         if(o.via.map.size != 0) {
             msgpack::object_kv* p(o.via.map.ptr);
-            s << p->key << "=>" << p->val;
+            s << p->key << ':' << p->val;
             ++p;
             for(msgpack::object_kv* const pend(o.via.map.ptr + o.via.map.size);
                     p < pend; ++p) {
-                s << ", " << p->key << "=>" << p->val;
+                s << ", " << p->key << ':' << p->val;
             }
         }
         s << "}";
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 1392dd8f..04e673d8 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -29,6 +29,7 @@ LIST (APPEND check_PROGRAMS
     msgpack_c.cpp
     reference.cpp
     limit.cpp
+    json.cpp
 )
 
 IF (MSGPACK_BOOST)
diff --git a/test/Makefile.am b/test/Makefile.am
index 67657f57..5272e754 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -26,6 +26,7 @@ check_PROGRAMS = \
 		reference_cpp11 \
 		reference \
 		limit \
+		json \
 		iterator_cpp11 \
 		boost_optional
 
@@ -78,6 +79,8 @@ reference_cpp11_SOURCES = reference_cpp11.cpp
 
 limit_SOURCES = limit.cpp
 
+json_SOURCES = json.cpp
+
 iterator_cpp11_SOURCES = iterator_cpp11.cpp
 
 boost_optional_SOURCES = boost_optional.cpp
diff --git a/test/json.cpp b/test/json.cpp
new file mode 100644
index 00000000..e3e2a1a9
--- /dev/null
+++ b/test/json.cpp
@@ -0,0 +1,32 @@
+#include <msgpack.hpp>
+#include <fstream>
+#include <sstream>
+#include <gtest/gtest.h>
+
+TEST(json, basic_elements)
+{
+    typedef std::map<std::string, int> map_s_i;
+    map_s_i msi;
+    msi.insert(map_s_i::value_type("Hello", 789));
+    msi.insert(map_s_i::value_type("World", -789));
+
+    msgpack::type::tuple<int, int, double, double, bool, bool, std::string, map_s_i>
+        t1(12, -34, 1.23, -4.56, true, false, "ABC", msi);
+
+    msgpack::zone z;
+    msgpack::object o(t1, z);
+    std::stringstream ss;
+    ss << o;
+    EXPECT_EQ(ss.str(), "[12, -34, 1.23, -4.56, true, false, \"ABC\", {\"Hello\":789, \"World\":-789}]");
+}
+
+TEST(json, escape)
+{
+    std::string s = "\"\\/\b\f\n\r\tabc";
+
+    msgpack::zone z;
+    msgpack::object o(s, z);
+    std::stringstream ss;
+    ss << o;
+    EXPECT_EQ(ss.str(), "\"\\\"\\\\\\/\\b\\f\\n\\r\\tabc\"");
+}