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GymSys separates runtime configuration from source code through environment variable files. This lets you point the frontend at a local development backend, a staging server, or a production API without modifying any JavaScript. The frontend reads one Vite environment variable; the backend variables below are a reference for whichever separate server implementation you choose to build or connect.

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Frontend Environment Variables

The GymSys frontend reads one environment variable at startup:
VariableDefaultDescription
VITE_API_URLhttp://localhost:3001/apiBase URL for the backend REST API. All fetch calls are prefixed with this value.
To override the default, create a .env.local file in the project root (next to package.json) and set the variable: 
VITE_API_URL=https://api.yourdomain.com/api
Vite automatically loads .env.local during both vite dev and vite build. Because the filename matches Vite’s built-in gitignore pattern, the file is not committed to version control — keeping secrets and environment-specific URLs out of your repository history. You can also use .env.production to set values that apply only when running vite build: 
# .env.production
VITE_API_URL=https://api.yourdomain.com/api
The VITE_ prefix is required for Vite to expose an environment variable to the browser bundle. Any variable defined without this prefix (e.g. API_URL=...) is intentionally kept server-side and will be undefined when accessed via import.meta.env in client code. Always prefix frontend variables with VITE_.

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Backend Environment Variables

The backend server is not included in this repository, but a typical Node.js implementation will need the following variables. Create a .env file in your backend project root: 
PORT=3001
DB_CONNECTION=your_database_url
CORS_ORIGIN=http://localhost:5173
VariableDescription
PORTThe port the backend HTTP server binds to. The frontend defaults to 3001 — change both values together if you use a different port.
DB_CONNECTIONFull connection string for your database (PostgreSQL, MySQL, SQLite, etc.).
CORS_ORIGINThe frontend origin that the backend permits in its CORS policy. Use http://localhost:5173 for local development and your production domain in staging/production.

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Production Checklist

Before deploying GymSys to a public environment, verify each of the following items:
  • Set VITE_API_URL to your production API URL and rebuild with npm run build.
  • Enable HTTPS on both the frontend host and the backend API server. Browsers will block mixed-content requests (HTTPS page → HTTP API).
  • Configure the backend CORS_ORIGIN to allow exactly your production frontend domain — avoid wildcard (*) origins in production.
  • Run npm run build and deploy the contents of the dist/ folder to your static file host.
  • Configure your static host to redirect all unmatched paths to index.html to support React Router’s client-side navigation.
  • Verify that the backend is running, reachable from the frontend host, and returning the expected JSON shapes described in the Backend Setup guide.

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