diff --git a/js/js.libraries/src/core/json.kt b/js/js.libraries/src/core/json.kt
index 4b6429da4ae..54bb603c758 100644
--- a/js/js.libraries/src/core/json.kt
+++ b/js/js.libraries/src/core/json.kt
@@ -21,4 +21,13 @@ library("jsonFromTuples")
 fun json2(pairs : Array<Tuple2<String, Any?>>) : Json = js.noImpl
 
 library("jsonAddProperties")
-fun Json.add(other : Json) : Json = js.noImpl
\ No newline at end of file
+fun Json.add(other : Json) : Json = js.noImpl
+
+native
+trait JsonClass {
+    fun stringify(o: Any): String = noImpl
+    fun parse<T>(text: String): T = noImpl
+}
+
+native
+val JSON:JsonClass = noImpl
\ No newline at end of file