Port 5173: Localhost:5173 Development Vite Port

# 定义

Port 5173 was chosen by the Vite team as the default development server port. The number 5173 spells 'site' on a phone keypad (5=S, 1=I, 7=T, 3=E), making it memorable and thematically appropriate for a web development tool. Vite has revolutionized frontend development with its extremely fast cold start times and efficient hot module replacement, making port 5173 increasingly common in modern web development workflows.

# Services and Software That Use Port 5173

## Build Tools

• Vite

Next-generation frontend build tool that defaults to port 5173 for development server with instant server start and lightning fast HMR.

• Vite + Vue

Vue.js projects created with Vite automatically use port 5173 for development server.

• Vite + React

React applications using Vite as build tool run development server on port 5173.

• Vite + Svelte

Svelte projects with Vite build configuration use port 5173 for local development.

## Frontend Frameworks

• Vue 3 Applications

Modern Vue.js applications often use Vite as build tool, running on port 5173.

• React + TypeScript

React applications with TypeScript using Vite for faster development experience.

• Svelte Kit

SvelteKit applications can be configured to use Vite on port 5173.

• Vanilla JavaScript

Plain JavaScript projects using Vite for modern development tooling.

## Development Tools

• Vite Plugin Ecosystem

Rich ecosystem of Vite plugins that extend functionality while running on port 5173.

• Vitest

Unit testing framework powered by Vite, shares the same fast development experience.

• Storybook + Vite

Storybook can be configured to use Vite builder, potentially running on port 5173.

## Other Tools

• Vite Preview Server

Production preview server (vite preview) can be configured to use port 5173.

• Electron + Vite

Electron applications using Vite for renderer process development.

• PWA with Vite

Progressive Web Apps built with Vite running development server on port 5173.

# Frequently Asked Questions

Q: How do I access localhost:5173?

A:

Run 'npm run dev' in your Vite project directory, then open http://localhost:5173 in your browser. Vite will also display the exact URL in the terminal.

Q: Why does Vite use port 5173?

A:

Port 5173 spells 'SITE' on a phone keypad (5=S, 1=I, 7=T, 3=E), making it memorable and appropriate for a web development tool. It's also uncommon enough to avoid conflicts.

Q: How is Vite different from webpack dev server?

A:

Vite uses native ES modules and esbuild for much faster cold starts and hot module replacement compared to webpack. It only bundles code for production, keeping development fast.

Q: How to change Vite port from 5173?

A:

Use 'npm run dev -- --port 8080' for one-time change, or add 'server: { port: 8080 }' to your vite.config.js for permanent configuration.

Q: Should I use port 5173 in production?

A:

No, port 5173 is only for development. In production, build your app with 'npm run build' and serve the dist folder through a proper web server on standard ports.

Q: How to access Vite dev server from other devices?

A:

Use 'npm run dev -- --host' or 'npm run dev -- --host 0.0.0.0' to allow network access, then use your computer's IP address with port 5173.

Q: Why is Vite HMR not working on localhost:5173?

A:

HMR uses WebSocket connections. Check if firewalls are blocking it, ensure correct URL access, and verify that you're not behind a proxy that blocks WebSockets.

Q: How to preview production build on localhost:5173?

A:

Run 'npm run build' then 'npm run preview'. By default, preview runs on port 4173, but you can configure it to use 5173 in vite.config.js preview settings.

# How to Use Port 5173

1.

Create Vite Project

Create a new Vite project using npm, yarn, or pnpm. Choose your preferred framework template (React, Vue, Svelte, etc.).

                        bash
                    
npm create vite@latest my-app

2.

Navigate and Install Dependencies

Navigate to the project directory and install all required dependencies.

                        bash
                    
cd my-app && npm install

3.

Start Vite Development Server

Start the Vite development server. It will automatically run on port 5173 with hot module replacement enabled.

                        bash
                    
npm run dev

4.

Access Your Application

Open your browser and navigate to http://localhost:5173. Vite will display the local and network URLs in the terminal.

                        bash
                    
curl http://localhost:5173

5.

Enjoy Fast Development

Experience instant server start and lightning-fast hot module replacement. Edit your source files and see changes reflected immediately.

# Common Problems

## MEDIUM Severity Issues

⚠ Port 5173 Already in Use

Another Vite instance or service is using port 5173. Vite will automatically try the next available port (5174, 5175, etc.) but this can be confusing.

⚠ Module Resolution Errors

Vite cannot resolve certain modules or imports, often due to incorrect file paths or missing dependencies.

⚠ Hot Module Replacement Not Working

Changes to source files are not automatically reflected in the browser, defeating Vite's main advantage.

## HIGH Severity Issues

⚠ Vite Command Not Found

The 'vite' command is not recognized, indicating Vite is not installed globally or the project dependencies are not installed.

## LOW Severity Issues

⚠ Build vs Development Differences

Code works in development (port 5173) but fails in production build, often due to environment differences or dynamic imports.

# Troubleshooting Solutions

## All Platform

Resolve Vite Port Conflict

For: Port 5173 Already in Use

Steps:

Check if another Vite development server is running
Kill existing Vite processes if not needed
Specify a custom port for your Vite server
Configure permanent port in vite.config.js

                            all
                        
npm run dev -- --port 5174

Fix Vite HMR Issues

For: Hot Module Replacement Not Working

Steps:

Ensure you're accessing the correct localhost URL
Check if firewall or antivirus is blocking WebSocket connections
Verify file watching is working correctly
Clear browser cache and restart Vite server

                            all
                        
npm run dev -- --host 0.0.0.0

Fix Vite HMR Issues

For: Hot Module Replacement Not Working

Steps:

Ensure you're accessing the correct localhost URL
Check if firewall or antivirus is blocking WebSocket connections
Verify file watching is working correctly
Clear browser cache and restart Vite server

                            all
                        
rm -rf node_modules/.vite && npm run dev

## Linux/macOS Platform

Resolve Vite Port Conflict

For: Port 5173 Already in Use

Steps:

Check if another Vite development server is running
Kill existing Vite processes if not needed
Specify a custom port for your Vite server
Configure permanent port in vite.config.js

                            linux/macos
                        
lsof -ti:5173 | xargs kill -9

## Windows Platform

Resolve Vite Port Conflict

For: Port 5173 Already in Use

Steps:

Check if another Vite development server is running
Kill existing Vite processes if not needed
Specify a custom port for your Vite server
Configure permanent port in vite.config.js

                            windows
                        
netstat -ano | findstr :5173

# Summary

root@localhost:~# echo "Port 5173 Documentation Complete"

What it is: localhost:5173 is Localhost:5173 is the default development port for Vite, a fast build tool and development server for modern web projects. Vite provides lightning-fast hot module replacement and is commonly used with Vue, React, Svelte, and other frontend frameworks for optimized development experience.

Who uses it: Vite, Vite + Vue, Vite + React, Vite + Svelte, Vue 3 Applications, React + TypeScript, Svelte Kit, Vanilla JavaScript, Vite Plugin Ecosystem, Vitest, Storybook + Vite, Vite Preview Server, Electron + Vite, PWA with Vite

Access URL: http://localhost:5173