diff --git a/back-express/src/routes/defaultRoute.ts b/back-express/src/routes/defaultRoute.ts
index 514887b..7e36406 100644
--- a/back-express/src/routes/defaultRoute.ts
+++ b/back-express/src/routes/defaultRoute.ts
@@ -7,6 +7,11 @@ defaultRoute.get("/", (req, res) => {
   res.send("Something");
 });
 
+defaultRoute.get("/", (req, res) => {
+  res.status(400);
+  res.send("Something");
+});
+
 defaultRoute.post("/test", (req, res) => {
   res.send("Something with " + JSON.stringify(req.body));
 });
diff --git a/back-express/src/routes/users/users.service.ts b/back-express/src/routes/users/users.service.ts
new file mode 100644
index 0000000..d529577
--- /dev/null
+++ b/back-express/src/routes/users/users.service.ts
@@ -0,0 +1,11 @@
+class UserService {
+  constructor() {}
+
+  getAllUsers() {}
+
+  getUserById(id: number) {
+    return 3;
+  }
+}
+
+export default UserService;
diff --git a/back-express/src/routes/users/users.types.ts b/back-express/src/routes/users/users.types.ts
new file mode 100644
index 0000000..e69de29