How to fix npm ERR! Missing script: "dev" in npm

{
  "scripts": {
    "dev": "vite"
  }
}

{
  "scripts": {
    "dev": "next dev"
  }
}

{
  "scripts": {
    "dev": "nodemon index.js"
  }
}

{
  "scripts": {
    "dev": "webpack serve --mode development"
  }
}

{
  "scripts": {
    "dev": "react-scripts start"
  }
}

# Show all scripts
npm run

# Common alternatives to try:
npm start
npm run serve
npm run develop
npm run watch

# Check location
pwd

# Verify package.json exists
ls package.json

# Check scripts section
cat package.json | grep -A 20 '"scripts"'

# Install dependencies first
npm install

# Common dev tools:
npm install --save-dev nodemon
npm install --save-dev vite
npm install --save-dev webpack-dev-server

# Vite
npx vite

# Next.js
npx next dev

# Nodemon
npx nodemon index.js

# Webpack
npx webpack serve

// Wrong - second scripts overrides first
{
  "scripts": { "dev": "vite" },
  "scripts": { "build": "vite build" }
}

// Correct - single scripts object
{
  "scripts": {
    "dev": "vite",
    "build": "vite build"
  }
}