diff --git a/.gitignore b/.gitignore
index e07ccd3..0e31d07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -172,3 +172,17 @@ cython_debug/
 # PyPI configuration file
 .pypirc
 app/.env
+
+# Node.js and React
+node_modules/
+build/
+dist/
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.eslintcache
+.DS_Store
diff --git a/frontend/src/services/api.js b/frontend/src/services/api.js
index a0ddc0b..a4a7292 100644
--- a/frontend/src/services/api.js
+++ b/frontend/src/services/api.js
@@ -3,7 +3,7 @@
  * All endpoints return { result, error } (BaseResponse).
  */
 
-const BASE_URL = process.env.REACT_APP_API_URL || '';
+const BASE_URL = process.env.REACT_APP_API_URL || '/api';
 
 async function request(method, path, body = null) {
   const options = {