Did you mean to visit localhost:5173?

Looking for: http://localhost:5173/?

💡 Pro Tip: Port 5173 is Vite's default development port. It's lightning fast and perfect for modern frontend development with hot module replacement.

🛠️ Need Help with Port Configuration?

Use our interactive tools to check port conflicts and generate framework-specific commands:

→ Port Checker & Command Generator Tool

Quick Commands for Port 5173

Find what's using port 5173:
lsof -i :5173 (Mac/Linux)
netstat -ano | findstr :5173 (Windows)
Start Vite on different port:
npm run dev -- --port 5174
vite --port 5174
Start with network access:
npm run dev -- --host
vite --host 0.0.0.0
Build for production:
npm run build
npm run preview (preview build)

🚀 Vite Configuration Examples

Essential vite.config.js configurations for development:

Basic Configuration:
// vite.config.js
export default defineConfig({
  server: {
    port: 5173,
    open: true,
    cors: true
  }
})
Proxy API calls:
server: {
  proxy: {
    '/api': {
      target: 'http://localhost:3000',
      changeOrigin: true
    }
  }
}

🐳 Docker Configuration for Vite

Running Vite applications in Docker containers:

Development Dockerfile:
FROM node:18-alpine
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 5173
CMD ["npm", "run", "dev", "--", "--host"]
Production Dockerfile:
FROM node:18-alpine as build
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build

FROM nginx:alpine
COPY --from=build /app/dist /usr/share/nginx/html

About Port 5173

Port 5173 is commonly used by:

Common Issues with Port 5173

"Port 5173 is already in use"

This error occurs when another application is already using port 5173. Solutions:

  • Find and close the application using port 5173
  • Use a different port:
    • Command line: npm run dev -- --port 5174
    • In vite.config.js: 
      export default defineConfig({
  server: {
    port: 5174
  }
})
  • On Windows, find and kill the process: netstat -ano | findstr :5173 then taskkill /PID [PID] /F
  • On Linux/Mac: lsof -i :5173 then kill -9 [PID]

"Hot Module Replacement (HMR) not working"

If changes aren't automatically reflecting in the browser:

  • Check if your Vite server is running with HMR enabled
  • Ensure you haven't disabled HMR in your vite.config.js
  • Check for errors in the browser console
  • Try restarting the development server
  • Make sure your file is being processed by Vite (check import paths)

"Cannot access localhost:5173 from other devices"

By default, Vite's development server only listens on localhost:

  • To make it accessible from other devices: npm run dev -- --host
  • Or in vite.config.js: 
    export default defineConfig({
  server: {
    host: '0.0.0.0'
  }
})
  • Then access it using your computer's IP address: http://YOUR_IP:5173

"Module resolution errors"

When Vite can't find your modules or imports fail:

  • Check file extensions - Vite needs explicit extensions for non-JS files
  • Verify your import paths are correct and case-sensitive
  • Use absolute imports with path mapping in vite.config.js
  • Clear node_modules and reinstall: rm -rf node_modules && npm install
  • Check if you need to configure resolve.alias in vite.config.js

"Build failures or slow builds"

When production builds fail or take too long:

  • Check for TypeScript errors: npm run type-check
  • Analyze bundle size: npm run build -- --analyze
  • Enable build caching and incremental builds
  • Review large dependencies and consider alternatives
  • Use dynamic imports for code splitting

🛠️ Essential Vite Plugins & Tools

Vue Development:
npm install @vitejs/plugin-vue

Enable Vue SFC support and HMR

React Development:
npm install @vitejs/plugin-react

Fast refresh and JSX support

TypeScript Support:
npm install typescript @types/node

Built-in TypeScript compilation

Environment Variables:
// .env files
VITE_API_URL=http://localhost:3000
VITE_APP_TITLE=My App

Access with import.meta.env.VITE_*

⚡ Performance Optimization Tips

🔧 Advanced Vite Features

CSS Preprocessors:
npm install sass less stylus

Built-in support, just import .scss/.less files

PostCSS Integration:
// postcss.config.js
export default {
  plugins: [require('autoprefixer')]
}
Global Stylus Variables:
css: {
  preprocessorOptions: {
    stylus: {
      additionalData: '@import "./src/vars.styl"'
    }
  }
}
Import Alias:
resolve: {
  alias: {
    '@': path.resolve(__dirname, './src'),
    '~': path.resolve(__dirname, './src')
  }
}

🔧 Troubleshooting Checklist

Before You Start Debugging:

  1. ✅ Check Node.js version (Vite requires Node 14.18+): node --version
  2. ✅ Verify you're in the correct project directory with package.json
  3. ✅ Ensure Vite is installed: npm list vite
  4. ✅ Check vite.config.js syntax and imports
  5. ✅ Verify no conflicting processes on port 5173
  6. ✅ Clear Vite cache: rm -rf node_modules/.vite
  7. ✅ Check browser console for JavaScript errors
  8. ✅ Try running in different browsers or incognito mode

🛡️ Security & Best Practices

Related Ports You Might Need

Useful Resources