Getting Started with Next.js Setting up a scalable web application begins with a solid foundation.
This guide covers the essential steps to install Next.js and understand its file architecture.
1. Installation The recommended way to start a new Next.js app is using the automatic setup tool.
Command: Run npx create-next-app@latest in your terminal.
Configuration: You will be prompted to configure your project, including choices for TypeScript, ESLint, Tailwind CSS, the src/ directory, and the App Router.
2. Project Structure: Top-Level Folders Understanding where your code lives is crucial. app:
specific to the App Router. pages: specific to the classic Pages Router.
public: Stores static assets (images, fonts) to be served.
src: An optional folder to keep your application source code (like components and lib) separate from config files.
3. Essential Configuration Files Your project root will contain several key files:
next.config.js: The main configuration file for Next.js.
middleware.ts: Handles request middleware.
.env files: Manages environment variables for local, production, and general use.
tsconfig.json / jsconfig.json: Configuration for TypeScript or JavaScript.
4. Mastering File-Based Routing Next.js uses the file system to define routes, making navigation intuitive.
Nested Routes: Create subdirectories to represent nested URL paths (e.g., folder/folder).
Dynamic Routes: [folder]: Captures a variable (e.g., /user/[id]).
[...folder]: Catch-all segment for multiple path segments.
[[...folder]]: Optional catch-all.
5. Advanced Routing Patterns For complex applications, Next.js offers advanced structural tools:
Route Groups (folder): Organize routes without affecting the URL structure.
Private Folders _folder: Exclude folders and their children from routing.
Parallel Routes @folder: Create named slots for complex layouts.
Intercepted Routes: Load a route from another part of your app within the current layout (e.g., (.)folder for same level, or (..)(..)folder for two levels up).