fix: friendly syntax

client/src/constants/index.js

@@ -1,7 +1,5 @@
-const {
 // api url (where your server is hosted at)
-  REACT_APP_BACKEND_URL: BACKEND_URL = 'http://localhost:8080',
-} = process.env
+const BACKEND_URL = process.env.REACT_APP_BACKEND_URL || 'http://localhost:8080'
 
 export {
   BACKEND_URL,