diff --git a/src/simulator/src/app.js b/src/simulator/src/app.ts
similarity index 97%
rename from src/simulator/src/app.js
rename to src/simulator/src/app.ts
index 95fcee23..0f4c7940 100644
--- a/src/simulator/src/app.js
+++ b/src/simulator/src/app.ts
@@ -1,8 +1,9 @@
-import { setup } from './setup'
+import { setup } from './setup';
+import { JsConfig } from './types/app.types'
 
 document.addEventListener('DOMContentLoaded', () => {
-    setup()
-    var js = {
+    setup();
+    const js: JsConfig = {
         devices: {
             dev0: {
                 type: 'Input',
@@ -206,5 +207,5 @@ document.addEventListener('DOMContentLoaded', () => {
             },
         ],
         subcircuits: {},
-    }
-})
+    };
+});
\ No newline at end of file
diff --git a/src/simulator/src/types/app.types.ts b/src/simulator/src/types/app.types.ts
new file mode 100644
index 00000000..e126fcd6
--- /dev/null
+++ b/src/simulator/src/types/app.types.ts
@@ -0,0 +1,33 @@
+interface Device {
+    type: string;
+    net?: string;
+    order?: number;
+    bits: number;
+    label?: string;
+    abits?: number;
+    words?: number;
+    offset?: number;
+    rdports?: Array<{ clock_polarity?: boolean }>;
+    wrports?: Array<{ clock_polarity?: boolean }>;
+    memdata?: Array<number | string>;
+}
+
+interface Connector {
+    to: {
+        id: string;
+        port: string;
+    };
+    from: {
+        id: string;
+        port: string;
+    };
+    name: string;
+}
+
+export interface JsConfig {
+    devices: {
+        [key: string]: Device;
+    };
+    connectors: Connector[];
+    subcircuits: Record<string, unknown>;
+}
\ No newline at end of file