diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 3dd549262..5a8617454 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -27,7 +27,7 @@
 // The version config.
 #define VERSION_MAJOR       3
 #define VERSION_MINOR       0
-#define VERSION_REVISION    60
+#define VERSION_REVISION    62
 
 // The macros generated by configure script.
 #include <srs_auto_headers.hpp>
diff --git a/trunk/src/protocol/srs_protocol_json.cpp b/trunk/src/protocol/srs_protocol_json.cpp
index 8565ae263..2465dea93 100644
--- a/trunk/src/protocol/srs_protocol_json.cpp
+++ b/trunk/src/protocol/srs_protocol_json.cpp
@@ -1585,7 +1585,7 @@ string SrsJsonAny::dumps()
         case SRS_JSON_Number: {
             // len(max int64_t) is 20, plus one "+-."
             char tmp[22];
-            snprintf(tmp, 22, "%.6f", to_number());
+            snprintf(tmp, 22, "%.2f", to_number());
             return tmp;
         }
         case SRS_JSON_Null: {
diff --git a/trunk/src/utest/srs_utest_amf0.cpp b/trunk/src/utest/srs_utest_amf0.cpp
index 5f6efbf6e..e2e19e69b 100644
--- a/trunk/src/utest/srs_utest_amf0.cpp
+++ b/trunk/src/utest/srs_utest_amf0.cpp
@@ -2493,3 +2493,73 @@ VOID TEST(ProtocolAMF0Test, Amf0Object2)
     }
 }
 
+VOID TEST(ProtocolJSONTest, Interfaces)
+{
+    if (true) {
+        SrsJsonAny* p = SrsJsonAny::str();
+        EXPECT_TRUE(p->is_string());
+        EXPECT_TRUE(p->to_str().empty());
+        srs_freep(p);
+    }
+
+    if (true) {
+        SrsJsonAny* p = SrsJsonAny::str("hello");
+        EXPECT_TRUE(p->is_string());
+        EXPECT_TRUE(string("hello") == p->to_str());
+        srs_freep(p);
+    }
+
+    if (true) {
+        SrsJsonAny* p = SrsJsonAny::str("hello", 2);
+        EXPECT_TRUE(p->is_string());
+        EXPECT_TRUE(string("he") == p->to_str());
+        srs_freep(p);
+    }
+}
+
+VOID TEST(ProtocolJSONTest, Dumps)
+{
+    if (true) {
+        SrsJsonAny* p = SrsJsonAny::str("hello");
+        EXPECT_TRUE(p->is_string());
+        EXPECT_STREQ("\"hello\"", p->dumps().c_str());
+        srs_freep(p);
+    }
+
+    if (true) {
+        SrsJsonAny* p = SrsJsonAny::boolean(true);
+        EXPECT_STREQ("true", p->dumps().c_str());
+        srs_freep(p);
+    }
+
+    if (true) {
+        SrsJsonAny* p = SrsJsonAny::integer(3);
+        EXPECT_STREQ("3", p->dumps().c_str());
+        srs_freep(p);
+    }
+
+    if (true) {
+        SrsJsonAny* p = SrsJsonAny::number(3.1);
+        EXPECT_STREQ("3.10", p->dumps().c_str());
+        srs_freep(p);
+    }
+
+    if (true) {
+        SrsJsonAny* p = SrsJsonAny::null();
+        EXPECT_STREQ("null", p->dumps().c_str());
+        srs_freep(p);
+    }
+
+    if (true) {
+        SrsJsonObject* p = SrsJsonAny::object();
+        EXPECT_STREQ("{}", p->dumps().c_str());
+        srs_freep(p);
+    }
+
+    if (true) {
+        SrsJsonArray* p = SrsJsonAny::array();
+        EXPECT_STREQ("[]", p->dumps().c_str());
+        srs_freep(p);
+    }
+}
+