Run a custom script called "dev" from package.json
📦 Node.js-> Command Line
✨ The Prompt Phrase
npm run dev
💻 Code Preview
📦 All-in-One Code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Run a custom script called "dev" from package.json - Interactive Tutorial</title>
<link href="https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700;900&family=Fira+Code:wght@400;500;600&display=swap" rel="stylesheet">
<style>
:root {
--bg-primary: #0a0e27;
--bg-secondary: #151932;
--bg-card: #1e2139;
--accent-purple: #a855f7;
--accent-blue: #3b82f6;
--accent-green: #10b981;
--accent-red: #ef4444;
--accent-yellow: #f59e0b;
--accent-pink: #ec4899;
--accent-orange: #fb923c;
--text-primary: #f8fafc;
--text-secondary: #94a3b8;
--gradient-dev: linear-gradient(135deg, #fb923c 0%, #f59e0b 100%);
--gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
--shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: 'Poppins', sans-serif;
background: var(--bg-primary);
color: var(--text-primary);
line-height: 1.6;
overflow-x: hidden;
}
.container {
max-width: 1200px;
margin: 0 auto;
padding: 20px;
}
.progress-container {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 5px;
background: var(--bg-secondary);
z-index: 1000;
}
.progress-bar {
height: 100%;
background: var(--gradient-dev);
width: 0%;
transition: width 0.3s ease;
}
.hero {
text-align: center;
padding: 100px 20px;
background: var(--gradient-dev);
position: relative;
overflow: hidden;
border-radius: 0 0 50px 50px;
}
.hero::before {
content: '';
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="white" opacity="0.1"/></svg>');
animation: float 20s linear infinite;
}
@keyframes float {
from { transform: translateY(0); }
to { transform: translateY(-100px); }
}
.hero-content {
position: relative;
z-index: 1;
}
.dev-icon {
font-size: 5rem;
margin-bottom: 20px;
animation: devSpin 3s ease-in-out infinite;
}
@keyframes devSpin {
0%, 100% { transform: rotate(0deg) scale(1); }
50% { transform: rotate(180deg) scale(1.1); }
}
.command-display {
display: inline-block;
background: rgba(0, 0, 0, 0.4);
padding: 25px 40px;
border-radius: 15px;
font-family: 'Fira Code', monospace;
font-size: 1.8rem;
margin: 30px 0;
border: 3px solid rgba(255, 255, 255, 0.3);
animation: pulse 2s ease-in-out infinite;
color: white;
font-weight: 600;
}
@keyframes pulse {
0%, 100% { transform: scale(1); }
50% { transform: scale(1.05); }
}
.hero h1 {
font-size: 3.5rem;
font-weight: 900;
margin-bottom: 20px;
color: white;
text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}
.hero p {
font-size: 1.4rem;
opacity: 0.95;
color: white;
}
.section {
margin: 60px 0;
}
.section-title {
font-size: 2.5rem;
margin-bottom: 30px;
background: var(--gradient-dev);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
display: inline-block;
font-weight: 700;
}
.card {
background: var(--bg-card);
border-radius: 20px;
padding: 40px;
margin: 30px 0;
box-shadow: var(--shadow);
border: 1px solid rgba(255, 255, 255, 0.05);
transition: transform 0.3s ease;
}
.card:hover {
transform: translateY(-5px);
}
.code-block {
background: #1e1e1e;
border-radius: 15px;
padding: 25px;
margin: 20px 0;
font-family: 'Fira Code', monospace;
position: relative;
}
.code-header {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 15px;
padding-bottom: 15px;
border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.terminal-dots {
display: flex;
gap: 6px;
}
.terminal-dot {
width: 12px;
height: 12px;
border-radius: 50%;
}
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }
.copy-btn {
background: var(--accent-purple);
color: white;
border: none;
padding: 8px 16px;
border-radius: 8px;
cursor: pointer;
font-size: 0.9rem;
transition: all 0.3s ease;
}
.copy-btn:hover {
background: var(--accent-blue);
transform: scale(1.05);
}
.copy-btn.copied {
background: var(--accent-green);
}
pre {
margin: 0;
overflow-x: auto;
}
code {
color: #e0e0e0;
font-size: 0.95rem;
line-height: 1.8;
}
.code-comment { color: #6a9955; }
.code-string { color: #ce9178; }
.code-keyword { color: #569cd6; }
.code-property { color: #9cdcfe; }
.steps {
counter-reset: step-counter;
}
.step {
background: var(--bg-secondary);
border-radius: 15px;
padding: 30px;
margin: 20px 0;
position: relative;
padding-left: 100px;
transition: all 0.3s ease;
}
.step:hover {
background: var(--bg-card);
transform: translateX(10px);
}
.step::before {
counter-increment: step-counter;
content: counter(step-counter);
position: absolute;
left: 20px;
top: 50%;
transform: translateY(-50%);
width: 60px;
height: 60px;
background: var(--gradient-dev);
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
font-size: 1.8rem;
font-weight: 900;
color: white;
}
.step h3 {
color: var(--accent-orange);
margin-bottom: 10px;
font-size: 1.5rem;
}
.feature-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 25px;
margin: 30px 0;
}
.feature-card {
background: var(--bg-secondary);
padding: 30px;
border-radius: 15px;
text-align: center;
transition: all 0.3s ease;
border: 2px solid transparent;
}
.feature-card:hover {
border-color: var(--accent-orange);
transform: translateY(-10px);
}
.feature-icon {
font-size: 3.5rem;
margin-bottom: 15px;
}
.feature-title {
font-weight: 600;
color: var(--accent-orange);
margin-bottom: 10px;
font-size: 1.3rem;
}
.demo-container {
background: var(--bg-secondary);
border-radius: 20px;
padding: 40px;
margin: 30px 0;
}
.terminal {
background: #1e1e1e;
border-radius: 15px;
padding: 20px;
font-family: 'Fira Code', monospace;
min-height: 300px;
margin: 20px 0;
overflow-y: auto;
max-height: 500px;
}
.terminal-line {
margin: 10px 0;
}
.terminal-prompt {
color: var(--accent-green);
}
.demo-button {
background: var(--gradient-dev);
color: white;
border: none;
padding: 15px 40px;
border-radius: 50px;
font-size: 1.1rem;
font-weight: 600;
cursor: pointer;
transition: all 0.3s ease;
display: inline-flex;
align-items: center;
gap: 10px;
margin: 10px;
}
.demo-button:hover {
transform: scale(1.05);
box-shadow: 0 10px 30px rgba(251, 146, 60, 0.4);
}
.tabs {
display: flex;
gap: 10px;
margin-bottom: 20px;
flex-wrap: wrap;
}
.tab {
padding: 12px 24px;
background: var(--bg-secondary);
border: none;
border-radius: 10px;
color: var(--text-primary);
cursor: pointer;
transition: all 0.3s ease;
font-size: 1rem;
}
.tab:hover {
background: var(--bg-card);
}
.tab.active {
background: var(--gradient-dev);
color: white;
}
.tab-content {
display: none;
}
.tab-content.active {
display: block;
}
.accordion-header {
cursor: pointer;
display: flex;
justify-content: space-between;
align-items: center;
padding: 20px;
background: var(--bg-secondary);
border-radius: 12px;
margin: 15px 0;
transition: all 0.3s ease;
}
.accordion-header:hover {
background: var(--bg-card);
}
.accordion-icon {
transition: transform 0.3s ease;
font-size: 1.2rem;
}
.accordion-icon.active {
transform: rotate(180deg);
}
.accordion-content {
max-height: 0;
overflow: hidden;
transition: max-height 0.3s ease;
}
.accordion-content.active {
max-height: 2000px;
}
.accordion-body {
padding: 20px;
background: var(--bg-secondary);
border-radius: 12px;
margin-top: 5px;
}
.tip, .warning, .success, .info {
padding: 20px;
border-radius: 10px;
margin: 20px 0;
}
.tip {
background: rgba(59, 130, 246, 0.1);
border-left: 4px solid var(--accent-blue);
}
.tip::before { content: '💡 '; font-size: 1.5rem; }
.warning {
background: rgba(239, 68, 68, 0.1);
border-left: 4px solid var(--accent-red);
}
.warning::before { content: '⚠️ '; font-size: 1.5rem; }
.success {
background: rgba(16, 185, 129, 0.1);
border-left: 4px solid var(--accent-green);
}
.success::before { content: '✅ '; font-size: 1.5rem; }
.info {
background: rgba(236, 72, 153, 0.1);
border-left: 4px solid var(--accent-pink);
}
.info::before { content: '🔍 '; font-size: 1.5rem; }
.quiz-container {
background: var(--bg-card);
border-radius: 20px;
padding: 40px;
margin: 30px 0;
}
.quiz-question {
margin: 30px 0;
}
.quiz-question h3 {
color: var(--accent-purple);
margin-bottom: 20px;
font-size: 1.3rem;
}
.quiz-options {
display: flex;
flex-direction: column;
gap: 15px;
}
.quiz-option {
background: var(--bg-secondary);
padding: 20px;
border-radius: 12px;
cursor: pointer;
transition: all 0.3s ease;
border: 2px solid transparent;
}
.quiz-option:hover {
border-color: var(--accent-blue);
transform: translateX(10px);
}
.quiz-option.correct {
border-color: var(--accent-green);
background: rgba(16, 185, 129, 0.1);
}
.quiz-option.incorrect {
border-color: var(--accent-red);
background: rgba(239, 68, 68, 0.1);
}
.quiz-feedback {
margin-top: 15px;
padding: 15px;
border-radius: 10px;
display: none;
}
.quiz-feedback.show {
display: block;
}
.quiz-feedback.correct {
background: rgba(16, 185, 129, 0.1);
border-left: 4px solid var(--accent-green);
}
.quiz-feedback.incorrect {
background: rgba(239, 68, 68, 0.1);
border-left: 4px solid var(--accent-red);
}
.cheat-sheet {
background: var(--gradient-dev);
border-radius: 20px;
padding: 40px;
margin: 30px 0;
color: white;
}
.cheat-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 20px;
margin-top: 30px;
}
.cheat-item {
background: rgba(255, 255, 255, 0.15);
backdrop-filter: blur(10px);
padding: 20px;
border-radius: 15px;
border: 1px solid rgba(255, 255, 255, 0.2);
}
.cheat-item h4 {
color: white;
margin-bottom: 10px;
font-weight: 600;
}
.cheat-item code {
background: rgba(0, 0, 0, 0.3);
padding: 4px 8px;
border-radius: 5px;
font-size: 0.9rem;
color: white;
}
.highlight {
color: var(--accent-yellow);
font-weight: 600;
}
.footer {
text-align: center;
padding: 40px 20px;
background: var(--bg-secondary);
margin-top: 80px;
border-radius: 20px;
}
.footer p {
color: var(--text-secondary);
margin: 10px 0;
}
.badge {
display: inline-block;
padding: 6px 12px;
background: var(--gradient-dev);
border-radius: 20px;
font-size: 0.85rem;
font-weight: 600;
margin: 5px;
}
.confetti {
position: fixed;
width: 10px;
height: 10px;
background: var(--accent-orange);
animation: confetti-fall 3s linear forwards;
z-index: 9999;
}
@keyframes confetti-fall {
to {
transform: translateY(100vh) rotate(360deg);
opacity: 0;
}
}
@media (max-width: 768px) {
.hero h1 { font-size: 2rem; }
.command-display { font-size: 1.2rem; padding: 15px 20px; }
.section-title { font-size: 1.8rem; }
.card { padding: 25px; }
.step { padding-left: 80px; }
.step::before { width: 50px; height: 50px; font-size: 1.5rem; }
}
</style>
</head>
<body>
<div class="progress-container">
<div class="progress-bar" id="progressBar"></div>
</div>
<div class="hero">
<div class="hero-content">
<div class="dev-icon">⚙️</div>
<h1>Master npm run dev!</h1>
<div class="command-display">npm run dev</div>
<p>Start your development environment! 🔥</p>
</div>
</div>
<div class="container">
<!-- What Is It -->
<section class="section">
<h2 class="section-title">🤔 What Is npm run dev?</h2>
<div class="card">
<p style="font-size: 1.2rem; margin-bottom: 20px;">
This command <span class="highlight">runs</span> a <strong>custom script called "dev"</strong> that you define in your package.json file! ⚙️
</p>
<p style="margin-bottom: 20px;">
Think of it like starting your development workshop! 🛠️ The "dev" script typically starts your development server with features like hot-reloading, source maps, and debugging tools - everything you need for a smooth coding experience!
</p>
<div class="info">
<strong>Breaking It Down:</strong>
<ul style="margin-left: 30px; margin-top: 10px; line-height: 2;">
<li><code>npm</code> - Node Package Manager</li>
<li><code>run</code> - Execute a custom script</li>
<li><code>dev</code> - Your custom development script name</li>
</ul>
</div>
<div style="margin-top: 30px;">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Why "dev" and not "start"? 🔍</h3>
<p><code>npm start</code> is a built-in shortcut, but <code>npm run dev</code> is a custom script you create! Many developers use "dev" for development mode and "start" for production.</p>
</div>
</div>
</section>
<!-- Why Use It -->
<section class="section">
<h2 class="section-title">✨ Why Use npm run dev?</h2>
<div class="card">
<div class="feature-grid">
<div class="feature-card">
<div class="feature-icon">🔥</div>
<div class="feature-title">Hot Reload</div>
<p style="color: var(--text-secondary);">See changes instantly without refresh!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🐛</div>
<div class="feature-title">Debug Mode</div>
<p style="color: var(--text-secondary);">Enhanced debugging tools!</p>
</div>
<div class="feature-card">
<div class="feature-icon">📍</div>
<div class="feature-title">Source Maps</div>
<p style="color: var(--text-secondary);">Debug original code, not compiled!</p>
</div>
<div class="feature-card">
<div class="feature-icon">⚡</div>
<div class="feature-title">Fast Builds</div>
<p style="color: var(--text-secondary);">Optimized for development speed!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🎯</div>
<div class="feature-title">Custom Config</div>
<p style="color: var(--text-secondary);">Dev-specific settings!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🚀</div>
<div class="feature-title">Quick Start</div>
<p style="color: var(--text-secondary);">One command to start coding!</p>
</div>
</div>
</div>
</section>
<!-- How It Works -->
<section class="section">
<h2 class="section-title">⚙️ How Does It Work?</h2>
<div class="card">
<div class="steps">
<div class="step">
<h3>Step 1: Reads package.json</h3>
<p>npm looks for the "dev" script in your scripts section.</p>
</div>
<div class="step">
<h3>Step 2: Executes Command</h3>
<p>Runs whatever command you've defined (Vite, Webpack, Next.js, etc.).</p>
</div>
<div class="step">
<h3>Step 3: Starts Dev Server</h3>
<p>Launches your development server with hot-reload enabled.</p>
</div>
<div class="step">
<h3>Step 4: Watches Files</h3>
<p>Monitors your code for changes and rebuilds automatically.</p>
</div>
<div class="step">
<h3>Step 5: Ready to Code!</h3>
<p>Your dev environment is running - time to build! 🎉</p>
</div>
</div>
</div>
</section>
<!-- Live Demo -->
<section class="section">
<h2 class="section-title">🎮 Interactive Demo</h2>
<div class="demo-container">
<h3 style="margin-bottom: 20px; font-size: 1.5rem;">See npm run dev in Action! 🚀</h3>
<button class="demo-button" onclick="simulateViteDev()">
<span>⚡</span>
<span>Run Vite Dev Server</span>
</button>
<button class="demo-button" onclick="simulateNextDev()">
<span>▲</span>
<span>Run Next.js Dev</span>
</button>
<div class="terminal" id="terminal">
<div class="terminal-line">
<span class="terminal-prompt">$</span>
<span style="color: var(--text-secondary);"> Ready for command...</span>
</div>
</div>
</div>
</section>
<!-- Code Breakdown -->
<section class="section">
<h2 class="section-title">💻 Framework Examples</h2>
<div class="card">
<div class="tabs">
<button class="tab active" onclick="switchTab('vite')">Vite</button>
<button class="tab" onclick="switchTab('nextjs')">Next.js</button>
<button class="tab" onclick="switchTab('react')">Create React App</button>
<button class="tab" onclick="switchTab('custom')">Custom</button>
</div>
<div id="vite" class="tab-content active">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Vite (Lightning Fast ⚡)</h3>
<div class="code-block">
<div class="code-header">
<div class="terminal-dots">
<div class="terminal-dot dot-red"></div>
<div class="terminal-dot dot-yellow"></div>
<div class="terminal-dot dot-green"></div>
</div>
<button class="copy-btn" onclick="copyCode('vite-code')">📋 Copy</button>
</div>
<pre><code id="vite-code"><span class="code-comment">// package.json</span>
{
<span class="code-property">"name"</span>: <span class="code-string">"my-vite-app"</span>,
<span class="code-property">"scripts"</span>: {
<span class="code-property">"dev"</span>: <span class="code-string">"vite"</span>,
<span class="code-property">"build"</span>: <span class="code-string">"vite build"</span>,
<span class="code-property">"preview"</span>: <span class="code-string">"vite preview"</span>
}
}
<span class="code-comment"># Start dev server:</span>
npm run dev
<span class="code-comment"># Opens at http://localhost:5173</span></code></pre>
</div>
<div class="success" style="margin-top: 15px;">
<strong>Why Vite?</strong> Instant server start, lightning-fast HMR, and native ES modules!
</div>
</div>
<div id="nextjs" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Next.js (React Framework)</h3>
<div class="code-block">
<div class="code-header">
<div class="terminal-dots">
<div class="terminal-dot dot-red"></div>
<div class="terminal-dot dot-yellow"></div>
<div class="terminal-dot dot-green"></div>
</div>
<button class="copy-btn" onclick="copyCode('nextjs-code')">📋 Copy</button>
</div>
<pre><code id="nextjs-code"><span class="code-comment">// package.json</span>
{
<span class="code-property">"name"</span>: <span class="code-string">"my-next-app"</span>,
<span class="code-property">"scripts"</span>: {
<span class="code-property">"dev"</span>: <span class="code-string">"next dev"</span>,
<span class="code-property">"build"</span>: <span class="code-string">"next build"</span>,
<span class="code-property">"start"</span>: <span class="code-string">"next start"</span>
}
}
<span class="code-comment"># Start dev server:</span>
npm run dev
<span class="code-comment"># Opens at http://localhost:3000</span></code></pre>
</div>
</div>
<div id="react" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Create React App</h3>
<div class="code-block">
<div class="code-header">
<div class="terminal-dots">
<div class="terminal-dot dot-red"></div>
<div class="terminal-dot dot-yellow"></div>
<div class="terminal-dot dot-green"></div>
</div>
<button class="copy-btn" onclick="copyCode('react-code')">📋 Copy</button>
</div>
<pre><code id="react-code"><span class="code-comment">// package.json</span>
{
<span class="code-property">"name"</span>: <span class="code-string">"my-react-app"</span>,
<span class="code-property">"scripts"</span>: {
<span class="code-property">"start"</span>: <span class="code-string">"react-scripts start"</span>,
<span class="code-property">"dev"</span>: <span class="code-string">"react-scripts start"</span>
}
}
<span class="code-comment"># Both work the same:</span>
npm start
npm run dev</code></pre>
</div>
</div>
<div id="custom" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Custom Development Scripts</h3>
<div class="code-block">
<div class="code-header">
<div class="terminal-dots">
<div class="terminal-dot dot-red"></div>
<div class="terminal-dot dot-yellow"></div>
<div class="terminal-dot dot-green"></div>
</div>
<button class="copy-btn" onclick="copyCode('custom-code')">📋 Copy</button>
</div>
<pre><code id="custom-code"><span class="code-comment">// package.json</span>
{
<span class="code-property">"scripts"</span>: {
<span class="code-property">"dev"</span>: <span class="code-string">"nodemon server.js"</span>,
<span class="code-property">"dev:watch"</span>: <span class="code-string">"nodemon --watch src server.js"</span>,
<span class="code-property">"dev:debug"</span>: <span class="code-string">"node --inspect server.js"</span>,
<span class="code-property">"dev:full"</span>: <span class="code-string">"concurrently \\"npm run server\\" \\"npm run client\\""</span>
}
}
<span class="code-comment"># Run different dev modes:</span>
npm run dev <span class="code-comment"># Basic dev</span>
npm run dev:watch <span class="code-comment"># Watch specific folder</span>
npm run dev:debug <span class="code-comment"># Debug mode</span></code></pre>
</div>
<div class="tip" style="margin-top: 15px;">
<strong>Pro Tip:</strong> Create multiple dev scripts for different scenarios!
</div>
</div>
</div>
</section>
<!-- Common Mistakes -->
<section class="section">
<h2 class="section-title">❌ Common Mistakes</h2>
<div class="card">
<div class="accordion">
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>1. Forgetting "run" Keyword</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> Typing <code>npm dev</code> instead of <code>npm run dev</code>!
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Custom scripts need "run" - only built-in commands like start, test, install work without it!
</div>
</div>
</div>
</div>
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>2. Port Already in Use</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> Dev server can't start because port is occupied!
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Kill the process using that port or change the port in your config!
</div>
</div>
</div>
</div>
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>3. No "dev" Script Defined</strong></span>
<span class="accordion-icon">▼</span>
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<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> Running npm run dev when there's no dev script!
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Add a "dev" script to package.json or check what scripts are available with <code>npm run</code>!
</div>
</div>
</div>
</div>
</div>
</div>
</section>
<!-- Pro Tips -->
<section class="section">
<h2 class="section-title">🚀 Pro Tips</h2>
<div class="card">
<div class="tip">
<strong>Use environment variables</strong> - Set <code>NODE_ENV=development</code> in your dev script!
</div>
<div class="tip">
<strong>Open browser automatically</strong> - Many tools support <code>--open</code> flag!
</div>
<div class="tip">
<strong>Custom port</strong> - Add <code>--port 8080</code> to run on different port!
</div>
<div class="tip">
<strong>Run multiple servers</strong> - Use <code>concurrently</code> to run frontend + backend together!
</div>
<div class="tip">
<strong>Check available scripts</strong> - Run <code>npm run</code> to see all available scripts!
</div>
<div class="tip">
<strong>Use aliases</strong> - Create shorter aliases in your shell for frequently used commands!
</div>
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<section class="section">
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<p style="margin-bottom: 30px; font-size: 1.1rem;">Test your understanding! 🧠</p>
<div class="quiz-question">
<h3>Question 1: What does npm run dev do?</h3>
<div class="quiz-options">
<div class="quiz-option" onclick="checkAnswer(this, false, 1)">A) Installs development dependencies</div>
<div class="quiz-option" onclick="checkAnswer(this, true, 1)">B) Runs the custom "dev" script from package.json</div>
<div class="quiz-option" onclick="checkAnswer(this, false, 1)">C) Builds for production</div>
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<h3>Question 2: Why do you need "run" in npm run dev?</h3>
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<div class="quiz-option" onclick="checkAnswer(this, false, 2)">A) It makes it run faster</div>
<div class="quiz-option" onclick="checkAnswer(this, true, 2)">B) Because "dev" is a custom script, not a built-in command</div>
<div class="quiz-option" onclick="checkAnswer(this, false, 2)">C) It's optional</div>
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<h3>Question 3: What's a common feature of dev mode?</h3>
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<div class="quiz-option" onclick="checkAnswer(this, false, 3)">A) Code minification</div>
<div class="quiz-option" onclick="checkAnswer(this, true, 3)">B) Hot reload / live updates</div>
<div class="quiz-option" onclick="checkAnswer(this, false, 3)">C) Slower performance</div>
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<h2 class="section-title">📚 Quick Reference</h2>
<div class="cheat-sheet">
<h3 style="margin-bottom: 20px; font-size: 2rem;">npm run dev Cheat Sheet! 🔖</h3>
<div class="cheat-grid">
<div class="cheat-item">
<h4>⚙️ Basic</h4>
<p><code>npm run dev</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Start dev server</p>
</div>
<div class="cheat-item">
<h4>📋 List Scripts</h4>
<p><code>npm run</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">See all available scripts</p>
</div>
<div class="cheat-item">
<h4>⚡ Vite</h4>
<p><code>"dev": "vite"</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Lightning fast</p>
</div>
<div class="cheat-item">
<h4>▲ Next.js</h4>
<p><code>"dev": "next dev"</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">React framework</p>
</div>
<div class="cheat-item">
<h4>🔧 Custom Port</h4>
<p><code>"dev": "vite --port 8080"</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Change port</p>
</div>
<div class="cheat-item">
<h4>🌐 Auto Open</h4>
<p><code>"dev": "vite --open"</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Open browser</p>
</div>
<div class="cheat-item">
<h4>🐛 Debug</h4>
<p><code>"dev": "node --inspect app.js"</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Debug mode</p>
</div>
<div class="cheat-item">
<h4>🔄 Nodemon</h4>
<p><code>"dev": "nodemon server.js"</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Auto-restart</p>
</div>
</div>
</div>
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<h2 style="font-size: 2rem; margin-bottom: 20px; color: var(--accent-pink);">🎉 Congratulations!</h2>
<p style="font-size: 1.2rem; margin-bottom: 20px;">You now understand <strong>npm run dev</strong>! 🚀</p>
<div style="margin: 30px 0;">
<span class="badge">⚙️ Dev Master</span>
<span class="badge">🔥 Hot Reload Pro</span>
<span class="badge">🚀 Script Expert</span>
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<p style="color: var(--text-secondary); margin-top: 30px;">Generated by <strong>AI Prompt Dictionary</strong> 🤖</p>
<p style="color: var(--text-secondary); font-size: 0.9rem;">Made with ❤️ for developers learning npm</p>
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