Topic 47 of 47
Production Build Optimizations
Overview
Next.js automatically optimizes your application during the `next build` phase. It minifies JavaScript, optimizes CSS, analyzes route static/dynamic status, and generates standalone builds for Docker deployments.
Syntax
typescript
// next.config.ts
const nextConfig = {
// Enables the standalone output mode (perfect for Docker)
// It copies only the necessary files for production into a single folder
output: 'standalone',
// Disable the x-powered-by header for security
poweredByHeader: false,
// Enable React Strict Mode (helps catch bugs during development)
reactStrictMode: true,
};
export default nextConfig;Common Pitfalls
- Never run `next dev` (npm run dev) in a production environment. Always use `next build` followed by `next start` for optimal performance.
- If you see a lambda (λ) icon next to your routes during the build output, it means the route is Dynamic (SSR). A circle (○) means it's Static (SSG). Aim for as many Static routes as possible.
Real-World Example
Using the Next.js Bundle Analyzer to find bloated dependencies:
example
typescript
// 1. Install the analyzer
// npm i @next/bundle-analyzer
// 2. Configure next.config.ts
const withBundleAnalyzer = require('@next/bundle-analyzer')({
enabled: process.env.ANALYZE === 'true',
});
module.exports = withBundleAnalyzer({
// other next config...
});
// 3. Run the analyzer
// ANALYZE=true npm run build
// This opens interactive HTML maps of your JS bundles in the browser.