diff --git a/bigpoint_dyntype.c b/bigpoint_dyntype.c
index d451e9c..c262fa1 100644
--- a/bigpoint_dyntype.c
+++ b/bigpoint_dyntype.c
@@ -56,6 +56,12 @@ __jsonConst(struct BIGPOINT_DYNTYPE * _this, struct json_object * json)
             }
             break;
 
+        case json_type_object:
+            _this->type = BIGPOINT_DYNTYPE_HASH;
+            _this->size = sizeof(struct BIGPOINT_HASH *);
+            (_this->data)._hash = newFromJson(BIGPOINT_HASH, json);
+            break;
+
         default:
             _this->type = BIGPOINT_DYNTYPE_NULL;
             _this->size = 0;
@@ -73,6 +79,10 @@ __destruct(struct BIGPOINT_DYNTYPE * _this)
                 free((_this->data)._string);
                 break;
 
+            case BIGPOINT_DYNTYPE_HASH:
+                delete((_this->data)._hash);
+                break;
+
             default:
                 break;
         }
@@ -94,6 +104,10 @@ __toJson(struct BIGPOINT_DYNTYPE * _this)
             json = json_object_new_string((_this->data)._string);
             break;
 
+        case BIGPOINT_DYNTYPE_HASH:
+            json = toJson((_this->data)._hash);
+            break;
+
         default:
             json = NULL;
     }
diff --git a/bigpoint_hash.c b/bigpoint_hash.c
index 49ddaff..254a23a 100644
--- a/bigpoint_hash.c
+++ b/bigpoint_hash.c
@@ -52,6 +52,17 @@ static
 struct json_object *
 __toJson(struct BIGPOINT_HASH * _this)
 {
+    size_t index;
+    struct json_object * json = json_object_new_object();
+
+    for (index = 0; index < _this->used; index ++) {
+        json_object_object_add(
+                json,
+                _this->keys[index],
+                toJson(_this->values[index]));
+    }
+
+    return json;
 }
 
 static const
diff --git a/tests/dyntype_test.c b/tests/dyntype_test.c
index d9d25a8..64a767f 100644
--- a/tests/dyntype_test.c
+++ b/tests/dyntype_test.c
@@ -6,6 +6,9 @@
 #include "../bigpoint_dyntype.h"
 
 #define TEST_STR "this is a foo string"
+#define TEST_KEY1 "key1"
+#define TEST_KEY2 "key2"
+#define TEST_KEY3 "key3"
 
 
 int
@@ -43,6 +46,33 @@ main(int argc, char * argv[])
     delete(dyn);
     json_object_put(json);
 
+    json = json_tokener_parse("{\"key1\":123,\"key2\":321,\"key3\":\"" TEST_STR "\"}");
+    dyn = newFromJson(BIGPOINT_DYNTYPE, json);
+    json_object_put(json);
+
+    json = toJson(dyn);
+    printf("%s\n", json_object_to_json_string(json));
+    json_object_put(json);
+
+    if (BIGPOINT_DYNTYPE_HASH == dyn->type) {
+        struct BIGPOINT_HASH * hash = (dyn->data)._hash;
+        struct BIGPOINT_DYNTYPE * value;
+
+        value = bigpoint_hash_get(hash, TEST_KEY1);
+        printf("%d\n", (value->data)._int);
+        delete(value);
+
+        value = bigpoint_hash_get(hash, TEST_KEY2);
+        printf("%d\n", (value->data)._int);
+        delete(value);
+
+        value = bigpoint_hash_get(hash, TEST_KEY3);
+        printf("%s\n", (value->data)._string);
+        delete(value);
+    }
+
+    delete(dyn);
+
     return 0;
 }
 
diff --git a/tests/hash_test.c b/tests/hash_test.c
index 71ba5fe..eabf6a4 100644
--- a/tests/hash_test.c
+++ b/tests/hash_test.c
@@ -3,7 +3,6 @@
 #include <json/json.h>
 
 #include "../bigpoint_cclass.h"
-#include "../bigpoint_dyntype.h"
 #include "../bigpoint_hash.h"
 
 
@@ -24,6 +23,10 @@ main(int argc, char * argv[])
     dyn = new(BIGPOINT_DYNTYPE, BIGPOINT_DYNTYPE_INT, sizeof(int), 321);
     bigpoint_hash_set(hash, TEST_KEY2, dyn);
 
+    json = toJson(hash);
+    printf("%s\n", json_object_to_json_string(json));
+    json_object_put(json);
+
     dyn = bigpoint_hash_get(hash, TEST_KEY1);
     printf("%d\n", (dyn->data)._int);
     delete(dyn);