diff --git a/tools/js-class-c-struct-transpiler/test/build.sh b/tools/js-class-c-struct-transpiler/test/build.sh
new file mode 100755
index 0000000..eba6d0b
--- /dev/null
+++ b/tools/js-class-c-struct-transpiler/test/build.sh
@@ -0,0 +1 @@
+emcc -lwebsocket.js -o index.html test_client.c
\ No newline at end of file
diff --git a/tools/js-class-c-struct-transpiler/test/schema.json b/tools/js-class-c-struct-transpiler/test/schema.json
index 5a59822..e392634 100644
--- a/tools/js-class-c-struct-transpiler/test/schema.json
+++ b/tools/js-class-c-struct-transpiler/test/schema.json
@@ -13,12 +13,38 @@
       "kind": "scalar"
     }
   },
+  "Camera3D": {
+    "position": {
+      "type": "Vector3",
+      "kind": "struct"
+    },
+    "target": {
+      "type": "Vector3",
+      "kind": "struct"
+    },
+    "up": {
+      "type": "Vector3",
+      "kind": "struct"
+    },
+    "fovy": {
+      "type": "f32",
+      "kind": "scalar"
+    },
+    "projection": {
+      "type": "f32",
+      "kind": "scalar"
+    }
+  },
   "Entity": {
     "Name": {
       "type": "string",
       "kind": "string",
       "size": "24"
     },
+    "Camera": {
+      "type": "Camera3D",
+      "kind": "struct"
+    },
     "Strength": {
       "type": "i32",
       "kind": "scalar"
@@ -139,27 +165,5 @@
       "type": "i32",
       "kind": "scalar"
     }
-  },
-  "Camera3D": {
-    "position": {
-      "type": "Vector3",
-      "kind": "struct"
-    },
-    "target": {
-      "type": "Vector3",
-      "kind": "struct"
-    },
-    "up": {
-      "type": "Vector3",
-      "kind": "struct"
-    },
-    "fovy": {
-      "type": "f32",
-      "kind": "scalar"
-    },
-    "projection": {
-      "type": "f32",
-      "kind": "scalar"
-    }
   }
 }
diff --git a/tools/js-class-c-struct-transpiler/test/test_client.c b/tools/js-class-c-struct-transpiler/test/test_client.c
new file mode 100644
index 0000000..e2efb6d
--- /dev/null
+++ b/tools/js-class-c-struct-transpiler/test/test_client.c
@@ -0,0 +1,116 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <emscripten/websocket.h>
+#include <assert.h>
+#include "out/types.h"
+
+EM_BOOL WebSocketOpen(int eventType, const EmscriptenWebSocketOpenEvent *e, void *userData) {
+  printf("open(eventType=%d, userData=%p)\n", eventType, userData);
+
+  Camera3D camera = {0};
+  camera.position = (Vector3){-9.0f, 9.0f, 4.0f};
+  camera.target = (Vector3){9.0f, 9.0f, 0.0f};
+  camera.up = (Vector3){0.0f, 1.0f, 0.0f};
+  camera.fovy = 60.0f;
+  camera.projection = 0;
+
+  emscripten_websocket_send_binary(e->socket, &camera, sizeof(camera));
+
+  return 0;
+}
+
+EM_BOOL WebSocketClose(int eventType, const EmscriptenWebSocketCloseEvent *e, void *userData) {
+  printf("close(eventType=%d, wasClean=%d, code=%d, reason=%s, userData=%p)\n", eventType, e->wasClean, e->code, e->reason, userData);
+  return 0;
+}
+
+EM_BOOL WebSocketError(int eventType, const EmscriptenWebSocketErrorEvent *e, void *userData) {
+  printf("error(eventType=%d, userData=%p)\n", eventType, userData);
+  return 0;
+}
+
+EM_BOOL WebSocketMessage(int eventType, const EmscriptenWebSocketMessageEvent *e, void *userData) {
+  printf("message(eventType=%d, userData=%p data=%p, numBytes=%d, isText=%d)\n", eventType, userData, e->data, e->numBytes, e->isText);
+  static int text_received = 0;
+  if (e->isText) {
+    printf("text data: \"%s\"\n", e->data);
+    assert(strcmp((const char*)e->data, "hello on the other side") == 0);
+    text_received = 1;
+    return 0;
+  }
+
+  Camera3D camera;
+  memcpy(&camera, e->data, sizeof camera);
+
+  printf("x: %f", camera.position.x);
+  printf(" y: %f", camera.position.y);
+  printf(" z: %f", camera.position.z);
+  printf(" fovy: %f", camera.fovy);
+  printf("\n");
+
+  emscripten_websocket_close(e->socket, 0, 0);
+  emscripten_websocket_delete(e->socket);
+  emscripten_force_exit(0);
+  return 0;
+}
+
+int main() {
+  assert(emscripten_websocket_is_supported());
+
+  EmscriptenWebSocketCreateAttributes attr;
+  emscripten_websocket_init_create_attributes(&attr);
+
+  const char *url = "ws://localhost:8089/";
+  attr.url = url;
+  // We don't really use a special protocol on the server backend in this test,
+  // but check that it can be passed.
+  attr.protocols = "binary,base64";
+
+  EMSCRIPTEN_WEBSOCKET_T socket = emscripten_websocket_new(&attr);
+  assert(socket >= 0);
+
+  // URL:
+  int urlLength = 0;
+  EMSCRIPTEN_RESULT res = emscripten_websocket_get_url_length(socket, &urlLength);
+  assert(res == EMSCRIPTEN_RESULT_SUCCESS);
+  assert(urlLength == strlen(url)+1);
+
+  char *url2 = malloc(urlLength);
+  res = emscripten_websocket_get_url(socket, url2, urlLength);
+  assert(res == EMSCRIPTEN_RESULT_SUCCESS);
+  printf("url: %s, verified: %s, length: %d\n", url, url2, urlLength);
+  assert(!strcmp(url, url2));
+
+  // Protocol:
+  int protocolLength = 0;
+  res = emscripten_websocket_get_protocol_length(socket, &protocolLength);
+  assert(res == EMSCRIPTEN_RESULT_SUCCESS);
+  assert(protocolLength == 1); // Null byte
+
+  char *protocol = malloc(protocolLength);
+  res = emscripten_websocket_get_protocol(socket, protocol, protocolLength);
+  assert(res == EMSCRIPTEN_RESULT_SUCCESS);
+  // We don't really use a special protocol on the server backend in this test,
+  // but test that it comes out as an empty string at least.
+  assert(!strcmp(protocol, ""));
+
+  // Extensions:
+  int extensionsLength = 0;
+  res = emscripten_websocket_get_extensions_length(socket, &extensionsLength);
+  assert(res == EMSCRIPTEN_RESULT_SUCCESS);
+  assert(extensionsLength == 1); // Null byte
+
+  char *extensions = malloc(extensionsLength);
+  res = emscripten_websocket_get_extensions(socket, extensions, extensionsLength);
+  assert(res == EMSCRIPTEN_RESULT_SUCCESS);
+  // We don't really use any extensions on the server backend in this test, but
+  // test that it comes out as an empty string at least.
+  assert(!strcmp(extensions, ""));
+
+  emscripten_websocket_set_onopen_callback(socket, (void*)0x42, WebSocketOpen);
+  emscripten_websocket_set_onclose_callback(socket, (void*)0x43, WebSocketClose);
+  emscripten_websocket_set_onerror_callback(socket, (void*)0x44, WebSocketError);
+  emscripten_websocket_set_onmessage_callback(socket, (void*)0x45, WebSocketMessage);
+  emscripten_exit_with_live_runtime();
+  return 0;
+}
\ No newline at end of file
diff --git a/tools/js-class-c-struct-transpiler/test/test_server.js b/tools/js-class-c-struct-transpiler/test/test_server.js
new file mode 100644
index 0000000..36290f3
--- /dev/null
+++ b/tools/js-class-c-struct-transpiler/test/test_server.js
@@ -0,0 +1,25 @@
+var decoder = new TextDecoder("utf-8");
+var port = 8089;
+var ws = require("ws");
+var wss = new ws.WebSocketServer({ port: port });
+console.log("WebSocket server listening on ws://localhost:" + port + "/");
+wss.on("connection", function (ws) {
+  console.log("Client connected!");
+  ws.on("message", function (message, isBinary) {
+    if (!isBinary) {
+      var text = decoder.decode(new Uint8Array(message).buffer);
+      console.log("received TEXT: " + text.length + " characters:");
+      console.log('  "' + text + '"');
+    } else {
+      const camera = new Camera3D({}, new Uint8Array(message));
+      console.log(camera.position.x, camera.position.y, camera.position.z);
+      console.log(camera.target.x, camera.target.y, camera.target.z);
+      console.log(camera.up.x, camera.up.y, camera.up.z);
+      console.log(camera.fovy);
+      console.log(camera.projection);
+      console.log(camera.bytes);
+
+      ws.send(camera.bytes, { binary: true }); // Echo back the received message
+    }
+  });
+});
diff --git a/tools/js-class-c-struct-transpiler/transpile.js b/tools/js-class-c-struct-transpiler/transpile.js
index c51b612..6d7235d 100644
--- a/tools/js-class-c-struct-transpiler/transpile.js
+++ b/tools/js-class-c-struct-transpiler/transpile.js
@@ -170,7 +170,9 @@ for (const type of Object.keys(schema)) {
 
   jsData += jsStructConstructor(size, containsString);
   jsData += `
-}`;
+}
+
+export default ${type}`;
   cData += `
 } ${type};