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Help! Getting "CORS error" when calling my API.
🐛 Classic CORS issue! Here's the fix: **What's happening:** Your browser blocks requests to a different domain/port for security. Your frontend (localhost:3000) is calling your API (localhost:8080). **Fix (choose one):** **Option 1: Backend fix (recommended)** ```js // Express.js const cors = require('cors'); app.use(cors({ origin: 'http://localhost:3000' })); ``` **Option 2: Proxy in dev** ```json // package.json "proxy": "http://localhost:8080" ``` **Option 3: Next.js rewrites** ```js // next.config.js async rewrites() { return [{ source: '/api/:path*', destination: 'http://localhost:8080/:path*' }] } ``` Option 1 is the proper fix. Need help implementing it?