Update jsutils.nim

Author: kidandcat

src/jsutils.nim

@@ -3,4 +3,5 @@ import jsffi, asyncjs, json
 proc fetchText*(url: cstring): Future[cstring] {.importcpp: "fetch(#).then(r => r.text())".}
 proc fetchJson*(url: cstring): Future[JsObject] {.importcpp: "fetch(#).then(r => r.json())".}
 proc fetchText*(url: cstring, config: JsonNode): Future[cstring] {.importcpp: "fetch(#, #).then(r => r.text())".}
-proc fetchJson*(url: cstring, config: JsonNode): Future[JsObject] {.importcpp: "fetch(#, #).then(r => r.json())".}
+proc fetchJson*(url: cstring, config: JsonNode): Future[JsObject] {.importcpp: "fetch(#, #).then(r => r.json())".}
+proc stringify*(c: JsObject): cstring {.importcpp:"JSON.stringify(#)".}