localhost:5173

See 5173 and wondering why not 3000? You're using Vite — the blazing fast build tool that's replacing Create React App and Vue CLI. Vite chose 5173 because it spells "SITE" on a phone keypad (5-1-7-3). Clever, right?

Open localhost:5173

What Uses Port 5173?

Framework	Command
Vite + React	`npm create vite@latest -- --template react`
Vite + Vue	`npm create vite@latest -- --template vue`
Vite + Svelte	`npm create vite@latest -- --template svelte`
SvelteKit	`npm create svelte@latest`
Astro	`npm create astro@latest`

Quick Start

# Create Vite + React project
npm create vite@latest my-app -- --template react
cd my-app
npm install
npm run dev

# Output:
# VITE v5.x ready in 300ms
# ➜ Local: http://localhost:5173/

Change Vite Port

// vite.config.js
export default {
  server: {
    port: 3000,        // Change port
    open: true,        // Auto-open browser
    host: true         // Expose to network
  }
}

Or use command line:

npm run dev -- --port 3000

Vite vs Create React App

Feature	Vite (5173)	CRA (3000)
Cold start	~300ms	~30 seconds
Hot reload	Instant	1-3 seconds
Build tool	esbuild + Rollup	Webpack
Config	vite.config.js	Eject required

Can't Connect?

Problem	Solution
Port already in use	Vite auto-increments to 5174, 5175...
Network access blocked	Add `host: true` to config
HMR not working	Check WebSocket connection in DevTools

Related Ports

Port	Common Use
3000	Create React App, Next.js
4200	Angular CLI
8080	Vue CLI (legacy)
5000	Flask, .NET