Verify node.js existence through command line.
📦 Node.js-> Command Line
✨ The Prompt Phrase
node -v
💻 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>⬢ Verify Node.js Existence</title>
<link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700;800&family=Fira+Code:wght@400;500&display=swap" rel="stylesheet">
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
--node: #68a063;
--cyan: #06b6d4;
--purple: #8b5cf6;
--pink: #ec4899;
--orange: #f97316;
--yellow: #fbbf24;
--blue: #3b82f6;
--green: #10b981;
--red: #ef4444;
--bg: #0a0e1a;
--card: #151b2e;
--text: #e2e8f0;
}
body {
font-family: 'Poppins', sans-serif;
background: var(--bg);
color: var(--text);
min-height: 100vh;
overflow-x: hidden;
}
/* Animated background */
.bg-animation {
position: fixed;
inset: 0;
z-index: -1;
overflow: hidden;
}
.float-node {
position: absolute;
font-size: 3rem;
opacity: 0.08;
animation: nodeFloat 22s infinite ease-in-out;
}
@keyframes nodeFloat {
0%, 100% { transform: translate(0, 0) rotate(0deg); }
25% { transform: translate(110px, -90px) rotate(90deg); }
50% { transform: translate(200px, 70px) rotate(180deg); }
75% { transform: translate(-80px, 150px) rotate(270deg); }
}
.orb {
position: absolute;
border-radius: 50%;
filter: blur(120px);
opacity: 0.14;
animation: orbFloat 32s ease-in-out infinite;
}
@keyframes orbFloat {
0%, 100% { transform: translate(0, 0) scale(1); }
50% { transform: translate(140px, -100px) scale(1.5); }
}
/* Progress bar */
.progress {
position: fixed;
top: 0;
left: 0;
height: 4px;
background: linear-gradient(90deg, var(--node), var(--cyan), var(--green));
z-index: 1000;
transition: width 0.2s;
}
/* Header */
header {
text-align: center;
padding: 70px 20px 50px;
position: relative;
}
.logo-container {
display: flex;
justify-content: center;
align-items: center;
gap: 28px;
margin-bottom: 38px;
flex-wrap: wrap;
}
.node-logo {
width: 130px;
height: 130px;
background: linear-gradient(135deg, var(--node), var(--green));
border-radius: 28px;
display: flex;
align-items: center;
justify-content: center;
font-size: 4.5rem;
cursor: pointer;
transition: all 0.3s;
box-shadow: 0 22px 65px rgba(104, 160, 99, 0.45);
animation: logoFloat 4s ease-in-out infinite;
position: relative;
overflow: hidden;
}
@keyframes logoFloat {
0%, 100% { transform: translateY(0) rotate(0deg); }
50% { transform: translateY(-20px) rotate(-6deg); }
}
.node-logo::before {
content: '';
position: absolute;
inset: 0;
background: linear-gradient(45deg, transparent, rgba(255,255,255,0.35), transparent);
animation: logoShine 3.5s infinite;
}
@keyframes logoShine {
0% { transform: translateX(-100%) rotate(45deg); }
100% { transform: translateX(200%) rotate(45deg); }
}
.node-logo:hover {
transform: scale(1.18) rotate(12deg);
box-shadow: 0 35px 90px rgba(104, 160, 99, 0.65);
}
.version-badge {
background: rgba(6, 182, 212, 0.15);
border: 2px solid var(--cyan);
border-radius: 16px;
padding: 14px 28px;
font-family: 'Fira Code', monospace;
font-size: 1.05rem;
animation: versionPulse 3.5s ease-in-out infinite;
color: var(--cyan);
font-weight: 600;
}
@keyframes versionPulse {
0%, 100% { box-shadow: 0 0 22px rgba(6, 182, 212, 0.35); transform: scale(1); }
50% { box-shadow: 0 0 45px rgba(6, 182, 212, 0.65); transform: scale(1.05); }
}
h1 {
font-size: clamp(2.2rem, 6vw, 3.8rem);
font-weight: 800;
background: linear-gradient(135deg, var(--node), var(--cyan), var(--green));
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
margin-bottom: 20px;
line-height: 1.2;
}
.subtitle {
color: #64748b;
font-size: 1.25rem;
max-width: 720px;
margin: 0 auto;
}
/* Main container */
main {
max-width: 1150px;
margin: 0 auto;
padding: 20px;
}
.section {
margin-bottom: 58px;
opacity: 0;
transform: translateY(55px);
transition: all 0.85s ease-out;
}
.section.vis {
opacity: 1;
transform: translateY(0);
}
.sec-title {
display: flex;
align-items: center;
gap: 20px;
font-size: 1.75rem;
font-weight: 700;
margin-bottom: 24px;
}
.sec-icon {
width: 58px;
height: 58px;
border-radius: 17px;
display: flex;
align-items: center;
justify-content: center;
font-size: 1.7rem;
animation: iconBounce 3.2s ease-in-out infinite;
}
@keyframes iconBounce {
0%, 100% { transform: translateY(0) rotate(-4deg); }
50% { transform: translateY(-10px) rotate(4deg); }
}
/* Cards */
.card {
background: var(--card);
border-radius: 24px;
padding: 34px;
margin-bottom: 26px;
border: 1px solid rgba(255,255,255,0.08);
transition: all 0.35s;
position: relative;
overflow: hidden;
}
.card::before {
content: '';
position: absolute;
top: 0;
left: 0;
right: 0;
height: 5px;
background: linear-gradient(90deg, var(--node), var(--cyan), var(--green));
}
.card:hover {
transform: translateY(-10px);
box-shadow: 0 32px 75px rgba(0,0,0,0.45);
border-color: var(--node);
}
.card h3 {
color: var(--node);
margin-bottom: 20px;
font-size: 1.45rem;
display: flex;
align-items: center;
gap: 14px;
}
.card p {
color: #94a3b8;
line-height: 1.95;
margin-bottom: 18px;
}
/* Featured card */
.featured {
background: linear-gradient(135deg, rgba(104, 160, 99, 0.16), rgba(6, 182, 212, 0.16));
border: 2px solid var(--node);
}
.featured-badge {
position: absolute;
top: -15px;
right: 32px;
background: linear-gradient(135deg, var(--orange), var(--yellow));
color: #000;
padding: 8px 22px;
border-radius: 24px;
font-size: 0.78rem;
font-weight: 700;
animation: badgeGlow 2.2s ease-in-out infinite;
}
@keyframes badgeGlow {
0%, 100% { box-shadow: 0 0 22px rgba(249, 115, 22, 0.55); }
50% { box-shadow: 0 0 45px rgba(249, 115, 22, 0.85); }
}
/* Code blocks */
.code-block {
background: #0a0f1a;
border-radius: 20px;
overflow: hidden;
margin: 24px 0;
border: 1px solid rgba(255,255,255,0.08);
box-shadow: 0 18px 50px rgba(0,0,0,0.45);
}
.code-header {
background: rgba(0,0,0,0.45);
padding: 17px 24px;
display: flex;
align-items: center;
justify-content: space-between;
}
.code-dots {
display: flex;
gap: 9px;
}
.dot {
width: 14px;
height: 14px;
border-radius: 50%;
cursor: pointer;
transition: all 0.25s;
}
.dot:hover { transform: scale(1.45); }
.dot.r { background: #ff5f56; }
.dot.y { background: #ffbd2e; }
.dot.g { background: #27ca40; }
.code-lang {
color: var(--node);
font-size: 0.95rem;
font-weight: 600;
font-family: 'Fira Code', monospace;
}
.code-copy {
background: rgba(255,255,255,0.12);
border: none;
padding: 9px 20px;
border-radius: 9px;
color: var(--text);
cursor: pointer;
font-size: 0.88rem;
transition: all 0.3s;
font-weight: 600;
}
.code-copy:hover {
background: var(--node);
transform: translateY(-3px);
color: #fff;
}
.code-copy.copied { background: var(--green); }
.code-body {
padding: 26px;
font-family: 'Fira Code', monospace;
font-size: 0.95rem;
line-height: 2.1;
overflow-x: auto;
}
.kw { color: var(--purple); }
.str { color: var(--yellow); }
.num { color: var(--orange); }
.func { color: var(--cyan); }
.comment { color: #6b7280; font-style: italic; }
.var { color: var(--pink); }
.cmd { color: var(--node); font-weight: 600; }
/* Command cards grid */
.cmd-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
gap: 18px;
margin: 24px 0;
}
.cmd-card {
background: rgba(255,255,255,0.03);
padding: 24px;
border-radius: 16px;
border: 2px solid rgba(255,255,255,0.08);
cursor: pointer;
transition: all 0.35s;
position: relative;
overflow: hidden;
}
.cmd-card::before {
content: '';
position: absolute;
top: 0;
left: -100%;
width: 100%;
height: 100%;
background: linear-gradient(90deg, transparent, rgba(104, 160, 99, 0.1), transparent);
transition: left 0.5s;
}
.cmd-card:hover::before {
left: 100%;
}
.cmd-card:hover {
border-color: var(--node);
background: rgba(104, 160, 99, 0.12);
transform: translateY(-6px);
}
.cmd-card-icon {
font-size: 2.8rem;
margin-bottom: 14px;
animation: iconFloat 3s ease-in-out infinite;
}
@keyframes iconFloat {
0%, 100% { transform: translateY(0); }
50% { transform: translateY(-8px); }
}
.cmd-card-title {
color: var(--node);
font-weight: 600;
font-size: 1.15rem;
margin-bottom: 10px;
font-family: 'Fira Code', monospace;
}
.cmd-card-desc {
color: #64748b;
font-size: 0.88rem;
line-height: 1.65;
}
/* Info boxes */
.info {
padding: 24px;
border-radius: 18px;
margin: 22px 0;
display: flex;
gap: 18px;
align-items: flex-start;
}
.info.tip {
background: rgba(16, 185, 129, 0.13);
border-left: 5px solid var(--green);
}
.info.warn {
background: rgba(251, 191, 36, 0.13);
border-left: 5px solid var(--yellow);
}
.info.important {
background: rgba(104, 160, 99, 0.13);
border-left: 5px solid var(--node);
}
.info.cool {
background: rgba(6, 182, 212, 0.13);
border-left: 5px solid var(--cyan);
}
.info-icon {
font-size: 1.6rem;
flex-shrink: 0;
animation: iconWiggle 2.5s ease-in-out infinite;
}
@keyframes iconWiggle {
0%, 100% { transform: rotate(0deg); }
25% { transform: rotate(-10deg); }
75% { transform: rotate(10deg); }
}
/* Interactive terminal */
.terminal-container {
background: linear-gradient(135deg, rgba(104, 160, 99, 0.12), rgba(6, 182, 212, 0.12));
border-radius: 24px;
padding: 38px;
border: 2px solid rgba(104, 160, 99, 0.35);
margin: 30px 0;
}
.terminal-title {
font-size: 1.6rem;
font-weight: 700;
color: var(--yellow);
margin-bottom: 24px;
text-align: center;
}
.terminal {
background: #0a0f1a;
border-radius: 18px;
overflow: hidden;
margin: 24px 0;
box-shadow: 0 22px 65px rgba(0,0,0,0.55);
}
.term-header {
background: rgba(0,0,0,0.45);
padding: 16px 24px;
display: flex;
align-items: center;
gap: 12px;
}
.term-title {
flex: 1;
text-align: center;
color: #64748b;
font-size: 0.95rem;
font-weight: 600;
}
.term-body {
padding: 26px;
font-family: 'Fira Code', monospace;
font-size: 0.95rem;
min-height: 220px;
max-height: 520px;
overflow-y: auto;
}
.term-line {
margin-bottom: 12px;
animation: lineAppear 0.35s ease-out;
}
@keyframes lineAppear {
from { opacity: 0; transform: translateX(-12px); }
to { opacity: 1; transform: translateX(0); }
}
.prompt {
color: var(--node);
font-weight: 600;
text-shadow: 0 0 12px rgba(104, 160, 99, 0.5);
}
.cursor {
display: inline-block;
width: 11px;
height: 22px;
background: var(--node);
animation: blink 1.1s infinite;
vertical-align: middle;
margin-left: 3px;
}
@keyframes blink {
0%, 50% { opacity: 1; }
51%, 100% { opacity: 0; }
}
/* Buttons */
.btn-group {
display: flex;
gap: 16px;
justify-content: center;
flex-wrap: wrap;
margin: 26px 0;
}
.btn {
background: linear-gradient(135deg, var(--node), var(--green));
border: none;
padding: 15px 32px;
border-radius: 15px;
color: white;
font-weight: 700;
cursor: pointer;
transition: all 0.35s;
display: flex;
align-items: center;
gap: 12px;
font-size: 1.05rem;
}
.btn:hover {
transform: translateY(-4px);
box-shadow: 0 18px 45px rgba(104, 160, 99, 0.55);
}
.btn.secondary {
background: linear-gradient(135deg, var(--cyan), var(--blue));
}
.btn.success {
background: linear-gradient(135deg, var(--green), var(--cyan));
}
.btn.purple {
background: linear-gradient(135deg, var(--purple), var(--pink));
}
/* Steps */
.steps {
display: flex;
flex-direction: column;
gap: 20px;
}
.step {
display: flex;
gap: 22px;
padding: 26px;
background: rgba(255,255,255,0.025);
border-radius: 18px;
border: 1px solid rgba(255,255,255,0.07);
cursor: pointer;
transition: all 0.35s;
}
.step:hover {
transform: translateX(14px);
border-color: var(--node);
background: rgba(104, 160, 99, 0.12);
}
.step-num {
width: 52px;
height: 52px;
border-radius: 50%;
background: linear-gradient(135deg, var(--node), var(--green));
display: flex;
align-items: center;
justify-content: center;
font-weight: 800;
flex-shrink: 0;
font-size: 1.3rem;
box-shadow: 0 10px 28px rgba(104, 160, 99, 0.45);
}
.step-content h4 {
margin-bottom: 10px;
color: var(--text);
font-size: 1.15rem;
}
.step-content p {
color: #64748b;
font-size: 0.98rem;
margin: 0;
line-height: 1.7;
}
/* Result display */
.result-box {
background: rgba(16, 185, 129, 0.12);
border: 2px solid var(--green);
border-radius: 18px;
padding: 26px;
margin: 22px 0;
display: none;
}
.result-box.show {
display: block;
animation: slideDown 0.55s ease-out;
}
@keyframes slideDown {
from { opacity: 0; transform: translateY(-25px); }
to { opacity: 1; transform: translateY(0); }
}
.result-icon {
font-size: 3.5rem;
text-align: center;
margin-bottom: 18px;
animation: iconPop 0.6s ease-out;
}
@keyframes iconPop {
0% { transform: scale(0); }
50% { transform: scale(1.2); }
100% { transform: scale(1); }
}
.result-text {
text-align: center;
color: var(--green);
font-weight: 600;
font-size: 1.15rem;
}
/* Comparison table */
.comparison {
overflow-x: auto;
margin: 26px 0;
}
.comparison table {
width: 100%;
border-collapse: collapse;
background: var(--card);
border-radius: 18px;
overflow: hidden;
}
.comparison th {
background: rgba(104, 160, 99, 0.22);
padding: 20px;
text-align: left;
color: var(--node);
font-weight: 600;
}
.comparison td {
padding: 20px;
border-top: 1px solid rgba(255,255,255,0.06);
color: #94a3b8;
}
.comparison tr:hover {
background: rgba(255,255,255,0.035);
}
/* Quiz */
.quiz {
background: linear-gradient(135deg, rgba(139, 92, 246, 0.12), rgba(236, 72, 153, 0.12));
border-radius: 24px;
padding: 34px;
border: 2px solid rgba(139, 92, 246, 0.35);
}
.quiz-q {
font-size: 1.3rem;
font-weight: 600;
margin-bottom: 26px;
}
.quiz-opts {
display: flex;
flex-direction: column;
gap: 16px;
}
.quiz-opt {
padding: 20px 26px;
background: var(--card);
border-radius: 16px;
cursor: pointer;
transition: all 0.35s;
border: 2px solid transparent;
display: flex;
align-items: center;
gap: 18px;
}
.quiz-opt:hover {
border-color: var(--purple);
transform: translateX(12px);
}
.quiz-opt.correct {
border-color: var(--green);
background: rgba(16, 185, 129, 0.22);
}
.quiz-opt.wrong {
border-color: var(--red);
background: rgba(239, 68, 68, 0.22);
}
.opt-letter {
width: 38px;
height: 38px;
border-radius: 50%;
background: rgba(255,255,255,0.12);
display: flex;
align-items: center;
justify-content: center;
font-weight: 700;
}
.quiz-result {
margin-top: 22px;
padding: 22px;
border-radius: 16px;
text-align: center;
font-weight: 600;
display: none;
}
.quiz-result.show {
display: block;
animation: slideUp 0.55s ease-out;
}
@keyframes slideUp {
from { opacity: 0; transform: translateY(25px); }
to { opacity: 1; transform: translateY(0); }
}
/* FAB */
.fab {
position: fixed;
bottom: 32px;
right: 32px;
width: 66px;
height: 66px;
border-radius: 50%;
background: linear-gradient(135deg, var(--node), var(--green));
border: none;
cursor: pointer;
display: flex;
align-items: center;
justify-content: center;
font-size: 1.9rem;
color: white;
box-shadow: 0 18px 45px rgba(104, 160, 99, 0.55);
transition: all 0.35s;
z-index: 100;
opacity: 0;
visibility: hidden;
}
.fab.show { opacity: 1; visibility: visible; }
.fab:hover { transform: scale(1.25) rotate(18deg); }
/* Toast */
.toast {
position: fixed;
bottom: 130px;
left: 50%;
transform: translateX(-50%) translateY(130px);
background: var(--card);
padding: 20px 38px;
border-radius: 18px;
border: 2px solid var(--node);
box-shadow: 0 22px 65px rgba(0,0,0,0.65);
transition: all 0.45s cubic-bezier(0.68, -0.55, 0.265, 1.55);
z-index: 1000;
opacity: 0;
max-width: 90%;
}
.toast.show {
transform: translateX(-50%) translateY(0);
opacity: 1;
}
/* Footer */
footer {
text-align: center;
padding: 52px 20px;
background: var(--card);
margin-top: 65px;
border-top: 1px solid rgba(255,255,255,0.08);
}
.footer-icons {
display: flex;
justify-content: center;
gap: 22px;
margin-bottom: 22px;
}
.footer-icon {
width: 56px;
height: 56px;
border-radius: 50%;
background: rgba(255,255,255,0.08);
display: flex;
align-items: center;
justify-content: center;
font-size: 1.7rem;
cursor: pointer;
transition: all 0.35s;
}
.footer-icon:hover {
background: var(--node);
transform: translateY(-10px);
}
@media (max-width: 768px) {
.cmd-grid { grid-template-columns: 1fr; }
.btn-group { flex-direction: column; }
.btn { width: 100%; justify-content: center; }
h1 { font-size: 2.2rem; }
}
</style>
</head>
<body>
<div class="progress" id="progress"></div>
<div class="bg-animation" id="bgAnim"></div>
<header>
<div class="logo-container">
<div class="node-logo" onclick="celebrate()">⬢</div>
<div class="version-badge">$ node --version</div>
</div>
<h1>Verify Node.js Existence</h1>
<p class="subtitle">Master the art of checking if Node.js is installed on your system! 🚀</p>
</header>
<main>
<!-- What is Node.js -->
<section class="section" id="what">
<div class="sec-title">
<div class="sec-icon" style="background: linear-gradient(135deg, var(--node), var(--green));">⬢</div>
<span>What is Node.js?</span>
</div>
<div class="card featured">
<div class="featured-badge">⭐ ESSENTIAL</div>
<h3>🚀 JavaScript Runtime Environment</h3>
<p>Node.js is a powerful, open-source JavaScript runtime built on Chrome's V8 engine. It allows you to run JavaScript on your computer and servers, not just in web browsers!</p>
<div class="info cool">
<span class="info-icon">✨</span>
<div>
<strong>Why Verify Node.js?</strong>
<p>Before starting any Node.js development, you need to confirm that Node.js is properly installed and accessible from your command line!</p>
</div>
</div>
</div>
</section>
<!-- Basic Verification -->
<section class="section" id="basic">
<div class="sec-title">
<div class="sec-icon" style="background: linear-gradient(135deg, var(--cyan), var(--blue));">✅</div>
<span>Basic Verification Command</span>
</div>
<div class="card">
<h3>🔍 Check Node.js Version</h3>
<p>The most common way to verify Node.js is installed is to check its version:</p>
<div class="code-block">
<div class="code-header">
<div class="code-dots">
<div class="dot r"></div>
<div class="dot y"></div>
<div class="dot g"></div>
</div>
<span class="code-lang">Terminal / Command Prompt</span>
<button class="code-copy" onclick="copyCode(this, 'node --version')">Copy</button>
</div>
<div class="code-body">
$ <span class="cmd">node</span> --version<br><br>
<span class="comment">// Output example:</span><br>
<span style="color: var(--green);">v20.10.0</span>
</div>
</div>
<div class="info tip">
<span class="info-icon">💡</span>
<div>
<strong>What This Means:</strong>
<p>If you see a version number (like v20.10.0), Node.js is installed! If you see "command not found" or an error, Node.js is not installed.</p>
</div>
</div>
<div class="info important">
<span class="info-icon">⚡</span>
<div>
<strong>Short Version:</strong>
<p>You can also use the shorthand: <code style="color: var(--node); font-family: 'Fira Code', monospace;">node -v</code></p>
</div>
</div>
</div>
</section>
<!-- All Verification Methods -->
<section class="section" id="methods">
<div class="sec-title">
<div class="sec-icon" style="background: linear-gradient(135deg, var(--purple), var(--pink));">🎯</div>
<span>All Verification Methods</span>
</div>
<div class="card">
<h3>🛠️ Different Ways to Verify</h3>
<p>Click on each method to learn more:</p>
<div class="cmd-grid">
<div class="cmd-card" onclick="showMethod('version')">
<div class="cmd-card-icon">🔢</div>
<div class="cmd-card-title">node --version</div>
<div class="cmd-card-desc">Shows the installed Node.js version number</div>
</div>
<div class="cmd-card" onclick="showMethod('which')">
<div class="cmd-card-icon">📍</div>
<div class="cmd-card-title">which node</div>
<div class="cmd-card-desc">Shows Node.js installation path (Mac/Linux)</div>
</div>
<div class="cmd-card" onclick="showMethod('where')">
<div class="cmd-card-icon">📂</div>
<div class="cmd-card-title">where node</div>
<div class="cmd-card-desc">Shows Node.js installation path (Windows)</div>
</div>
<div class="cmd-card" onclick="showMethod('repl')">
<div class="cmd-card-icon">💻</div>
<div class="cmd-card-title">node</div>
<div class="cmd-card-desc">Starts REPL (confirms Node.js works)</div>
</div>
<div class="cmd-card" onclick="showMethod('eval')">
<div class="cmd-card-icon">⚡</div>
<div class="cmd-card-title">node -e "code"</div>
<div class="cmd-card-desc">Execute JavaScript code directly</div>
</div>
<div class="cmd-card" onclick="showMethod('help')">
<div class="cmd-card-icon">❓</div>
<div class="cmd-card-title">node --help</div>
<div class="cmd-card-desc">Shows Node.js help and options</div>
</div>
</div>
</div>
</section>
<!-- Step by Step -->
<section class="section" id="steps">
<div class="sec-title">
<div class="sec-icon" style="background: linear-gradient(135deg, var(--orange), var(--yellow));">📋</div>
<span>Step-by-Step Guide</span>
</div>
<div class="card">
<h3>🚶 Follow These Steps</h3>
<div class="steps">
<div class="step" onclick="showToast('Step 1: Open your terminal!')">
<div class="step-num">1</div>
<div class="step-content">
<h4>Open Terminal/Command Prompt</h4>
<p><strong>Windows:</strong> Press <kbd style="background: var(--card); padding: 3px 10px; border-radius: 5px;">Win + R</kbd>, type "cmd", press Enter<br>
<strong>Mac:</strong> Press <kbd style="background: var(--card); padding: 3px 10px; border-radius: 5px;">Cmd + Space</kbd>, type "Terminal"<br>
<strong>Linux:</strong> Press <kbd style="background: var(--card); padding: 3px 10px; border-radius: 5px;">Ctrl + Alt + T</kbd></p>
</div>
</div>
<div class="step" onclick="showToast('Step 2: Type the command!')">
<div class="step-num">2</div>
<div class="step-content">
<h4>Type the Verification Command</h4>
<p>Type: <code style="color: var(--node); font-family: 'Fira Code', monospace;">node --version</code> or <code style="color: var(--node); font-family: 'Fira Code', monospace;">node -v</code></p>
</div>
</div>
<div class="step" onclick="showToast('Step 3: Press Enter!')">
<div class="step-num">3</div>
<div class="step-content">
<h4>Press Enter</h4>
<p>Execute the command and wait for the result</p>
</div>
</div>
<div class="step" onclick="showToast('Step 4: Check the output!')">
<div class="step-num">4</div>
<div class="step-content">
<h4>Interpret the Output</h4>
<p>✅ <strong>Version number (e.g., v20.10.0)</strong> = Node.js is installed<br>
❌ <strong>Error message</strong> = Node.js is not installed</p>
</div>
</div>
</div>
</div>
</section>
<!-- Interactive Terminal -->
<section class="section" id="interactive">
<div class="sec-title">
<div class="sec-icon" style="background: linear-gradient(135deg, var(--green), var(--cyan));">🎮</div>
<span>Interactive Terminal</span>
</div>
<div class="terminal-container">
<div class="terminal-title">🎯 Try Node.js Commands!</div>
<p style="text-align: center; color: #94a3b8; margin-bottom: 22px;">Click buttons to simulate Node.js verification commands</p>
<div class="terminal">
<div class="term-header">
<div class="dot r"></div>
<div class="dot y"></div>
<div class="dot g"></div>
<span class="term-title">Terminal Simulator</span>
</div>
<div class="term-body" id="termOutput">
<div class="term-line">
<span style="color: #64748b;">Welcome! Click a button below to test Node.js commands</span>
</div>
<div class="term-line"><span class="prompt">$</span> <span class="cursor"></span></div>
</div>
</div>
<div class="btn-group">
<button class="btn" onclick="runCommand('version')">
🔢 node --version
</button>
<button class="btn secondary" onclick="runCommand('eval')">
⚡ node -e
</button>
<button class="btn success" onclick="runCommand('repl')">
💻 node (REPL)
</button>
<button class="btn purple" onclick="clearTerm()">
🔄 Clear
</button>
</div>
<div class="result-box" id="resultBox">
<div class="result-icon">✅</div>
<div class="result-text">Node.js is installed and working perfectly!</div>
</div>
</div>
</section>
<!-- Understanding Output -->
<section class="section" id="output">
<div class="sec-title">
<div class="sec-icon" style="background: linear-gradient(135deg, var(--pink), var(--purple));">📊</div>
<span>Understanding the Output</span>
</div>
<div class="card">
<h3>🔍 What Does the Version Number Mean?</h3>
<div class="code-block">
<div class="code-header">
<div class="code-dots">
<div class="dot r"></div>
<div class="dot y"></div>
<div class="dot g"></div>
</div>
<span class="code-lang">Version Format</span>
</div>
<div class="code-body">
<span style="color: var(--green);">v20.10.0</span><br>
<span style="color: var(--cyan);">│ │ │</span><br>
<span style="color: var(--cyan);">│ │ └─</span> <span class="comment">Patch version (bug fixes)</span><br>
<span style="color: var(--cyan);">│ └────</span> <span class="comment">Minor version (new features)</span><br>
<span style="color: var(--cyan);">└───────</span> <span class="comment">Major version (breaking changes)</span>
</div>
</div>
<div class="info cool">
<span class="info-icon">📌</span>
<div>
<strong>Semantic Versioning:</strong>
<p>Node.js uses semantic versioning (semver): MAJOR.MINOR.PATCH</p>
</div>
</div>
<div class="comparison">
<table>
<thead>
<tr>
<th>Version Type</th>
<th>Example</th>
<th>Meaning</th>
</tr>
</thead>
<tbody>
<tr>
<td>LTS (Long Term Support)</td>
<td>v20.10.0</td>
<td>Stable, recommended for production</td>
</tr>
<tr>
<td>Current</td>
<td>v21.5.0</td>
<td>Latest features, may be less stable</td>
</tr>
<tr>
<td>Old/Legacy</td>
<td>v14.x.x</td>
<td>Outdated, should upgrade</td>
</tr>
</tbody>
</table>
</div>
</div>
</section>
<!-- Troubleshooting -->
<section class="section" id="troubleshoot">
<div class="sec-title">
<div class="sec-icon" style="background: linear-gradient(135deg, var(--yellow), var(--orange));">🔧</div>
<span>Troubleshooting</span>
</div>
<div class="card">
<h3>❗ Node.js Not Found?</h3>
<div class="info warn">
<span class="info-icon">⚠️</span>
<div>
<strong>Command Not Found:</strong>
<p>If you see "node: command not found" or similar, Node.js is not installed or not in your PATH.</p>
</div>
</div>
<div class="code-block">
<div class="code-header">
<div class="code-dots">
<div class="dot r"></div>
<div class="dot y"></div>
<div class="dot g"></div>
</div>
<span class="code-lang">Solution: Install Node.js</span>
</div>
<div class="code-body">
<span class="comment">// Download and install Node.js</span><br><br>
<span style="color: var(--cyan);">1.</span> Visit <span style="color: var(--yellow);">https://nodejs.org</span><br>
<span style="color: var(--cyan);">2.</span> Download the LTS version (recommended)<br>
<span style="color: var(--cyan);">3.</span> Run the installer<br>
<span style="color: var(--cyan);">4.</span> Restart your terminal<br>
<span style="color: var(--cyan);">5.</span> Try <span class="cmd">node --version</span> again
</div>
</div>
<div class="info tip">
<span class="info-icon">💡</span>
<div>
<strong>Restart Terminal:</strong>
<p>After installing Node.js, always close and reopen your terminal or command prompt before testing!</p>
</div>
</div>
</div>
</section>
<!-- Quick Reference -->
<section class="section" id="reference">
<div class="sec-title">
<div class="sec-icon" style="background: linear-gradient(135deg, var(--cyan), var(--blue));">📚</div>
<span>Quick Reference</span>
</div>
<div class="card">
<h3>⚡ Common Node.js Verification Commands</h3>
<div class="code-block">
<div class="code-header">
<div class="code-dots">
<div class="dot r"></div>
<div class="dot y"></div>
<div class="dot g"></div>
</div>
<span class="code-lang">Cheat Sheet</span>
<button class="code-copy" onclick="copyCode(this, 'node --version\nnode -v\nwhich node\nwhere node\nnode\nnode -e \"console.log(\'Hello\')\"\nnode --help')">Copy All</button>
</div>
<div class="code-body">
<span class="comment"># Check Node.js version</span><br>
<span class="cmd">node</span> --version<br>
<span class="cmd">node</span> -v<br><br>
<span class="comment"># Find Node.js location (Mac/Linux)</span><br>
<span class="func">which</span> node<br><br>
<span class="comment"># Find Node.js location (Windows)</span><br>
<span class="func">where</span> node<br><br>
<span class="comment"># Start Node.js REPL</span><br>
<span class="cmd">node</span><br><br>
<span class="comment"># Execute JavaScript code</span><br>
<span class="cmd">node</span> -e <span class="str">"console.log('Hello')"</span><br><br>
<span class="comment"># Get Node.js help</span><br>
<span class="cmd">node</span> --help
</div>
</div>
</div>
</section>
<!-- Quiz -->
<section class="section" id="quiz">
<div class="sec-title">
<div class="sec-icon" style="background: linear-gradient(135deg, var(--purple), var(--pink));">🧠</div>
<span>Test Your Knowledge!</span>
</div>
<div class="quiz">
<div class="quiz-q">Which command checks if Node.js is installed?</div>
<div class="quiz-opts">
<div class="quiz-opt" onclick="checkQuiz(this, false)">
<span class="opt-letter">A</span>
<span>node install</span>
</div>
<div class="quiz-opt" onclick="checkQuiz(this, true)">
<span class="opt-letter">B</span>
<span>node --version</span>
</div>
<div class="quiz-opt" onclick="checkQuiz(this, false)">
<span class="opt-letter">C</span>
<span>node start</span>
</div>
<div class="quiz-opt" onclick="checkQuiz(this, false)">
<span class="opt-letter">D</span>
<span>node check</span>
</div>
</div>
<div class="quiz-result" id="quizResult"></div>
</div>
</section>
</main>
<button class="fab" id="fab" onclick="scrollTop()">⬆️</button>
<div class="toast" id="toast"></div>
<footer>
<div class="footer-icons">
<div class="footer-icon">⬢</div>
<div class="footer-icon">💻</div>
<div class="footer-icon">🚀</div>
<div class="footer-icon">✨</div>
</div>
<p style="color: #64748b;">Master Node.js Verification! 🎉</p>
<p style="color: #475569; font-size: 0.88rem; margin-top: 10px;">Always verify before starting your projects!</p>
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