diff --git a/backend/ts/src/main/scala/aqua/backend/OutputFunc.scala b/backend/ts/src/main/scala/aqua/backend/OutputFunc.scala
index 10b1847d..8fcd8919 100644
--- a/backend/ts/src/main/scala/aqua/backend/OutputFunc.scala
+++ b/backend/ts/src/main/scala/aqua/backend/OutputFunc.scala
@@ -53,7 +53,7 @@ case class OutputFunc(func: FuncRes, types: Types) {
        |    `
        |    return callFunction(
        |        args,
-       |        ${funcDef.asJson.spaces4},
+       |        ${funcDef.asJson.deepDropNullValues.spaces4},
        |        script
        |    )
        |}""".stripMargin
diff --git a/backend/ts/src/main/scala/aqua/backend/OutputService.scala b/backend/ts/src/main/scala/aqua/backend/OutputService.scala
index af4e681b..5484ce8b 100644
--- a/backend/ts/src/main/scala/aqua/backend/OutputService.scala
+++ b/backend/ts/src/main/scala/aqua/backend/OutputService.scala
@@ -29,7 +29,7 @@ case class OutputService(srv: ServiceRes, types: Types) {
       |export function register${srv.name}(${typed("...args", "any")}) {
       |    registerService(
       |        args,
-      |        ${serviceDef.asJson.spaces4}
+      |        ${serviceDef.asJson.deepDropNullValues.spaces4}
       |    );
       |}
       """.stripMargin