Jun 2, 2026 · Frontend Stacks · 1min read

Next.js Local Development Guide

Build full-stack React applications with Next.js, featuring App Router support for SSR/SSG, with localhost defaulting to localhost:3000.

Next.js is a full-stack framework based on React, offering App Router, server components, API routes, static exports, and edge deployment. It is widely used for production-level web applications and marketing sites.

Quick Start

npx create-next-app@latest my-app
cd my-app
npm run dev

Default localhost Access

Purpose	Address
Development Server	http://localhost:3000

To change the port: npm run dev -- -p 3001 or adjust in package.json.

Common Commands

Command	Description
`npm run dev`	Development mode (Turbopack optional)
`npm run build`	Production build
`npm run start`	Run production server
`npm run lint`	ESLint check

Routing and Rendering

App Router (directory app/): Recommended for new projects
Supports SSR, SSG, ISR, and mixing client components
API and Server Actions can implement backend logic within the same repository

Deployment

Can be deployed to Vercel (official platform), Node servers, Docker, or generate a pure static site using output: 'export'.

Summary

Next.js local development defaults to http://localhost:3000, suitable for React full-stack and SEO-friendly modern web applications.