diff --git a/assets/js/deserializer.mjs b/assets/js/deserializer.mjs
new file mode 100644
index 000000000..30451b3cf
--- /dev/null
+++ b/assets/js/deserializer.mjs
@@ -0,0 +1,9 @@
+"use strict";
+
+export default class Deserializer {
+  static deserialize(data) {
+    if (typeof data === "string") {
+      return JSON.parse(data);
+    }
+  }
+}
diff --git a/test/javascript/deserializer_test.mjs b/test/javascript/deserializer_test.mjs
new file mode 100644
index 000000000..9cd77accf
--- /dev/null
+++ b/test/javascript/deserializer_test.mjs
@@ -0,0 +1,23 @@
+"use strict";
+
+import {
+  assert,
+  defineGlobalErlangAndElixirModules,
+} from "./support/helpers.mjs";
+
+import Deserializer from "../../assets/js/deserializer.mjs";
+import JsonEncoder from "../../assets/js/json_encoder.mjs";
+
+defineGlobalErlangAndElixirModules();
+
+describe("Deserializer", () => {
+  describe("deserialize()", () => {
+    it("string", () => {
+      const obj = {a: 1, b: 2};
+      const data = JsonEncoder.encode(obj);
+      const result = Deserializer.deserialize(data);
+
+      assert.deepStrictEqual(result, obj);
+    });
+  });
+});