diff --git a/priv/frontend/src/ws/errors.js b/priv/frontend/src/ws/errors.js
new file mode 100644
index 0000000..a5d1c7e
--- /dev/null
+++ b/priv/frontend/src/ws/errors.js
@@ -0,0 +1,4 @@
+export default {
+  INVALID_PAYLOAD: 4200,
+  TOO_MUCH: 4420,
+}