diff --git a/trunk/src/protocol/srs_protocol_json.cpp b/trunk/src/protocol/srs_protocol_json.cpp
index f58766538..f7bd1c5ed 100644
--- a/trunk/src/protocol/srs_protocol_json.cpp
+++ b/trunk/src/protocol/srs_protocol_json.cpp
@@ -1970,9 +1970,10 @@ SrsJsonAny* SrsJsonArray::at(int index)
     return elem;
 }
 
-void SrsJsonArray::add(SrsJsonAny* value)
+SrsJsonArray* SrsJsonArray::add(SrsJsonAny* value)
 {
     properties.push_back(value);
+    return this;
 }
 
 SrsJsonArray* SrsJsonArray::append(SrsJsonAny* value)
diff --git a/trunk/src/protocol/srs_protocol_json.hpp b/trunk/src/protocol/srs_protocol_json.hpp
index 1eedd9b23..0e3d8cab0 100644
--- a/trunk/src/protocol/srs_protocol_json.hpp
+++ b/trunk/src/protocol/srs_protocol_json.hpp
@@ -156,7 +156,7 @@ public:
     virtual int count();
     // @remark: max index is count().
     virtual SrsJsonAny* at(int index);
-    virtual void add(SrsJsonAny* value);
+    virtual SrsJsonArray* add(SrsJsonAny* value);
     // alias to add.
     virtual SrsJsonArray* append(SrsJsonAny* value);
 public:
diff --git a/trunk/src/utest/srs_utest_amf0.cpp b/trunk/src/utest/srs_utest_amf0.cpp
index d92efd289..aa6a2a607 100644
--- a/trunk/src/utest/srs_utest_amf0.cpp
+++ b/trunk/src/utest/srs_utest_amf0.cpp
@@ -2621,6 +2621,20 @@ VOID TEST(ProtocolJSONTest, Dumps)
         EXPECT_STREQ("[]", p->dumps().c_str());
         srs_freep(p);
     }
+
+    if (true) {
+        SrsJsonObject* p = SrsJsonAny::object();
+        p->set("id", SrsJsonAny::integer(3));
+        EXPECT_STREQ("{\"id\":3}", p->dumps().c_str());
+        srs_freep(p);
+    }
+
+    if (true) {
+        SrsJsonArray* p = SrsJsonAny::array();
+        p->add(SrsJsonAny::integer(3));
+        EXPECT_STREQ("[3]", p->dumps().c_str());
+        srs_freep(p);
+    }
 }
 
 VOID TEST(ProtocolJSONTest, Parse)
@@ -2680,3 +2694,78 @@ VOID TEST(ProtocolJSONTest, Parse)
     }
 }
 
+VOID TEST(ProtocolJSONTest, ObjectAPI)
+{
+    SrsJsonObject* p = SrsJsonAny::object();
+    SrsAutoFree(SrsJsonObject, p);
+
+    p->set("id", SrsJsonAny::integer(3));
+    p->set("name", SrsJsonAny::str("srs"));
+
+    EXPECT_STREQ("name", p->key_at(1).c_str());
+    EXPECT_STREQ("srs", p->value_at(1)->to_str().c_str());
+
+    p->set("name", NULL);
+    p->set("name", SrsJsonAny::str("ossrs"));
+    p->set("version", SrsJsonAny::number(3.1));
+    p->set("stable", SrsJsonAny::boolean(true));
+
+    SrsJsonObject* pp = SrsJsonAny::object();
+    p->set("args", pp);
+    pp->set("url", SrsJsonAny::str("ossrs.net"));
+    pp->set("year", SrsJsonAny::integer(2019));
+
+    SrsJsonArray* pa = SrsJsonAny::array();
+    p->set("authors", pa);
+    pa->add(SrsJsonAny::str("winlin"));
+    pa->add(SrsJsonAny::str("wenjie"));
+
+    SrsJsonAny* prop = p->get_property("name");
+    EXPECT_STREQ("ossrs", prop->to_str().c_str());
+    EXPECT_STREQ("ossrs", p->ensure_property_string("name")->to_str().c_str());
+
+    EXPECT_TRUE(NULL == p->get_property("invalid"));
+    EXPECT_TRUE(NULL == p->ensure_property_string("invalid"));
+    EXPECT_TRUE(NULL == p->ensure_property_string("id"));
+
+    EXPECT_TRUE(NULL == p->ensure_property_integer("invalid"));
+    EXPECT_TRUE(NULL == p->ensure_property_integer("name"));
+    EXPECT_EQ(3, p->ensure_property_integer("id")->to_integer());
+
+    EXPECT_TRUE(NULL == p->ensure_property_number("invalid"));
+    EXPECT_TRUE(NULL == p->ensure_property_number("name"));
+    EXPECT_EQ(3.1, p->ensure_property_number("version")->to_number());
+
+    EXPECT_TRUE(NULL == p->ensure_property_boolean("invalid"));
+    EXPECT_TRUE(NULL == p->ensure_property_boolean("name"));
+    EXPECT_TRUE(p->ensure_property_boolean("stable")->to_boolean());
+
+    EXPECT_TRUE(NULL == p->ensure_property_object("invalid"));
+    EXPECT_TRUE(NULL == p->ensure_property_object("name"));
+    EXPECT_TRUE(NULL != p->ensure_property_object("args")->to_object());
+
+    EXPECT_TRUE(NULL == p->ensure_property_array("invalid"));
+    EXPECT_TRUE(NULL == p->ensure_property_array("name"));
+    EXPECT_TRUE(NULL != p->ensure_property_array("authors")->to_array());
+
+    SrsAmf0Object* a = (SrsAmf0Object*)p->to_amf0();
+    EXPECT_EQ(6, a->count());
+    srs_freep(a);
+}
+
+VOID TEST(ProtocolJSONTest, ArrayAPI)
+{
+    SrsJsonArray* p = SrsJsonAny::array();
+    SrsAutoFree(SrsJsonArray, p);
+
+    p->add(SrsJsonAny::integer(2019));
+    p->add(SrsJsonAny::str("srs"));
+    p->add(SrsJsonAny::boolean(true));
+
+    EXPECT_STREQ("srs", p->at(1)->to_str().c_str());
+
+    SrsAmf0StrictArray* a = (SrsAmf0StrictArray*)p->to_amf0();
+    EXPECT_EQ(3, a->count());
+    srs_freep(a);
+}
+