Change API Base URL:
Before deploying, update any hardcoded localhost URLs to your production API endpoint.
Example:

// Change this
const BASE_URL = "http://localhost:5000/api";

// To this (your production URL)
const BASE_URL = "https://your-production-domain.com/api";

Update Version Number (Optional):
If your app uses a version number in the frontend (e.g., in a footer or app info), update it in the config or directly in the UI files.

Change Client Origin for CORS:
Update CORS settings to allow your deployed frontend instead of localhost.
Example in Node.js (Express):

const corsOptions = {
  origin: "https://your-frontend-domain.com", // instead of "http://localhost:3000"
  credentials: true,
};

Update Environment Variables:
Make sure environment-specific variables like database URIs, secret keys, etc., are correctly set in your hosting platform.

Versioning:
If you track API versioning (e.g., /api/v1), ensure it matches what's expected by the frontend.