diff --git a/error.js b/error.js
new file mode 100644
index 0000000..4bc8942
--- /dev/null
+++ b/error.js
@@ -0,0 +1,34 @@
+import * as Y from "yjs"; // eslint-disable-line
+import * as encoding from "lib0/encoding";
+import * as decoding from "lib0/decoding";
+
+/**
+ * @param {encoding.Encoder} encoder
+ * @param {number} code
+ * @param {string} message
+ */
+export const writeError = (encoder, code, message) => {
+    encoding.writeVarUint(encoder, code);
+    encoding.writeVarString(encoder, message);
+};
+
+/**
+ * @callback ErrorHandler
+ * @param {any} y
+ * @param {number} code
+ * @param {string} message
+ */
+
+/**
+ *
+ * @param {decoding.Decoder} decoder
+ * @param {Y.Doc} y
+ * @param {ErrorHandler} errorHandler
+ */
+export const readError = (decoder, y, errorHandler) => {
+    errorHandler(
+        y,
+        decoding.readVarUint(decoder),
+        decoding.readVarString(decoder)
+    );
+};