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menu_book Course Curriculum (Next.js) expand_more
App Router Foundations
App Router project structure Server Components Client Components with use client Nested layouts Route groups Dynamic route segments Catch-all route segments Loading UI with loading.tsx
Data and Rendering
Server-side data fetching fetch cache control Revalidation with next revalidate generateStaticParams generateMetadata Streaming with Suspense Error boundaries with error.tsx notFound and not-found.tsx
Server Features
Route Handlers GET Route Handlers POST Server Actions Cookies API Headers API Redirects Middleware matcher Draft Mode
Production Patterns
next/image optimization next/font next/link prefetching Environment variables Parallel routes Intercepting routes Metadata Open Graph images Cache tags and revalidateTag
Next.js / Production Patterns

Environment variables

Learn Environment variables in Next.js through a focused explanation, a topic-specific example, an engineering warning, and a mastery check.

12 min read • Advanced
nextjs-028.ts
typescript 
const apiBase = process.env.API_BASE_URL;
if(!apiBase) throw new Error('API_BASE_URL is required');
What to watch
Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Environment variables Mastery Check →
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Parallel routes