diff --git a/src/back/buildApp.js b/src/back/buildApp.js
new file mode 100644
index 0000000..759e8a3
--- /dev/null
+++ b/src/back/buildApp.js
@@ -0,0 +1,20 @@
+const buildApp = () => {
+  const express = require("express");
+  const path = require("path");
+
+  const app = express();
+
+  const STATIC_DIR_PATH = path.join(__dirname, "../", "../", "dist");
+  const INDEX_PATH = path.join(STATIC_DIR_PATH, "src", "front", "index.html");
+
+  app.use(express.json());
+  app.use(express.static(STATIC_DIR_PATH));
+
+  app.get("/", (request, response) => {
+    response.sendFile(INDEX_PATH);
+  });
+
+  return app;
+};
+
+module.exports = buildApp;
diff --git a/src/back/main.js b/src/back/main.js
index bdb8e3c..b057dbb 100644
--- a/src/back/main.js
+++ b/src/back/main.js
@@ -1,17 +1,6 @@
-const express = require("express");
-const path = require("path");
+const buildApp = require("./buildApp");
 
-const app = express();
-
-const STATIC_DIR_PATH = path.join(__dirname, "../", "../", "dist", );
-const INDEX_PATH = path.join(STATIC_DIR_PATH, "src", "front", "index.html");
-
-app.use(express.json());
-app.use(express.static(STATIC_DIR_PATH));
-
-app.get("/", (request, response) => {
-  response.sendFile(INDEX_PATH);
-});
+const app = buildApp();
 
 const PORT = 3003;
 app.listen(PORT, () => {