diff --git a/docs/hello-state/api.wasm b/docs/hello-state/api.wasm
index 4c976cd..13cb3da 100755
Binary files a/docs/hello-state/api.wasm and b/docs/hello-state/api.wasm differ
diff --git a/docs/hello/api.wasm b/docs/hello/api.wasm
index 12f64a5..252bfbe 100755
Binary files a/docs/hello/api.wasm and b/docs/hello/api.wasm differ
diff --git a/response_recorder.go b/response_recorder.go
index 855fde2..2ae000f 100644
--- a/response_recorder.go
+++ b/response_recorder.go
@@ -37,11 +37,11 @@ func (rr ResponseRecorder) JSValue() js.Value {
 
 	var body js.Value = js.Undefined()
 	if res.ContentLength != 0 {
-		body = js.Global().Get("Uint8Array").New(res.ContentLength)
 		var b, err = ioutil.ReadAll(res.Body)
 		if err != nil {
 			panic(err)
 		}
+		body = js.Global().Get("Uint8Array").New(len(b))
 		js.CopyBytesToJS(body, b)
 	}