7-3-useEffect

1. Create a local Postgres database

createdb todos_db

2. Configure environment variables

cp server/.env.template server/.env

Fill in your Postgres credentials. The pg library reads PGHOST, PGPORT, PGUSER, PGPASSWORD, and PGDATABASE from the environment automatically.

3. Install dependencies

cd server && npm install
cd ../frontend && npm install

4. Seed the database

cd server && npm run db:seed

5. Start both dev servers

# Terminal 1 — Express API on http://localhost:8080
cd server && npm run dev

# Terminal 2 — Vite dev server on http://localhost:5173
cd frontend && npm run dev

Open the app at http://localhost:5173, not 8080. The Vite dev server proxies /api/* to Express on port 8080. Because the browser treats both as the same origin, session cookies flow through transparently.