Abort the process on uncaught exceptions
📦 Node.js-> Command Line
✨ The Prompt Phrase
node --abort-on-uncaught-exception app.js
💻 Code Preview
📦 All-in-One Code
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<title>Abort the process on uncaught exceptions - Interactive Tutorial</title>
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</style>
</head>
<body>
<div class="progress-container">
<div class="progress-bar" id="progressBar"></div>
</div>
<div class="hero">
<div class="hero-content">
<div class="abort-icon">💥</div>
<h1>Abort on Exception!</h1>
<div class="command-display">node --abort-on-uncaught-exception app.js</div>
<p>Generate core dumps for debugging crashes! 🔍</p>
</div>
</div>
<div class="container">
<!-- What Is It -->
<section class="section">
<h2 class="section-title">🤔 What Is This Flag?</h2>
<div class="card">
<p style="font-size: 1.2rem; margin-bottom: 20px;">
This command makes Node.js <span class="highlight">immediately abort and generate a core dump</span> when an uncaught exception occurs, instead of just printing an error and exiting gracefully! 💥
</p>
<p style="margin-bottom: 20px;">
Think of it like a black box recorder for plane crashes! ✈️ Normally when your app crashes, Node.js prints an error and exits cleanly. With <code>--abort-on-uncaught-exception</code>, it creates a "core dump" - a snapshot of memory at the moment of the crash - which you can analyze later to understand EXACTLY what went wrong!
</p>
<div class="info">
<strong>Breaking It Down:</strong>
<ul style="margin-left: 30px; margin-top: 10px; line-height: 2;">
<li><code class="code-node">node</code> - Node.js runtime</li>
<li><code class="code-flag">--abort-on-uncaught-exception</code> - Abort and dump core on crash</li>
<li><code>app.js</code> - Your application file</li>
<li>Creates a core dump file for post-mortem debugging</li>
<li>Used for production debugging and crash analysis</li>
</ul>
</div>
<div style="margin-top: 30px;">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">What's a Core Dump? 🔍</h3>
<p>A core dump is a file containing the complete state of your application's memory at the moment it crashed. It includes all variables, stack traces, heap data - everything! You can load it into debugging tools like <code>llnode</code> or <code>gdb</code> to investigate the crash after it happened.</p>
</div>
</div>
</section>
<!-- Behavior Comparison -->
<section class="section">
<h2 class="section-title">📊 Normal vs Abort Mode</h2>
<div class="card">
<h3 style="margin-bottom: 20px; text-align: center;">See The Difference! 🎯</h3>
<div class="comparison-grid">
<div class="comparison-item normal">
<h4 style="color: var(--accent-blue); margin-bottom: 15px;">🔵 Normal Behavior</h4>
<div class="code-block" style="margin-top: 15px;">
<pre><code><span class="code-error">Error: Something broke!</span>
at main (app.js:42:15)
<span style="color: var(--text-secondary);">Process exits cleanly
Exit code: 1
No core dump generated</span></code></pre>
</div>
<p style="margin-top: 10px; font-size: 0.9rem; color: var(--text-secondary);">😐 Clean exit, but no memory snapshot</p>
</div>
<div class="comparison-item abort">
<h4 style="color: var(--accent-red); margin-bottom: 15px;">💥 Abort Mode</h4>
<div class="code-block" style="margin-top: 15px;">
<pre><code><span class="code-error">Error: Something broke!</span>
at main (app.js:42:15)
<span style="color: var(--accent-red);">Aborted (core dumped)
core.12345 generated
Exit code: 134 (SIGABRT)</span></code></pre>
</div>
<p style="margin-top: 10px; font-size: 0.9rem; color: var(--text-secondary);">🔍 Core dump saved for analysis!</p>
</div>
</div>
</div>
</section>
<!-- Why Use It -->
<section class="section">
<h2 class="section-title">✨ Why Use This Flag?</h2>
<div class="card">
<div class="feature-grid">
<div class="feature-card">
<div class="feature-icon">🔍</div>
<div class="feature-title">Post-Mortem Debug</div>
<p style="color: var(--text-secondary);">Analyze crashes later!</p>
</div>
<div class="feature-card">
<div class="feature-icon">💾</div>
<div class="feature-title">Memory Snapshot</div>
<p style="color: var(--text-secondary);">Complete state capture!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🏭</div>
<div class="feature-title">Production Debugging</div>
<p style="color: var(--text-secondary);">Debug live crashes!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🎯</div>
<div class="feature-title">Root Cause Analysis</div>
<p style="color: var(--text-secondary);">Find exact issue!</p>
</div>
<div class="feature-card">
<div class="feature-icon">📊</div>
<div class="feature-title">Heisenbug Hunting</div>
<p style="color: var(--text-secondary);">Catch rare bugs!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🛡️</div>
<div class="feature-title">Crash Reports</div>
<p style="color: var(--text-secondary);">Better diagnostics!</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: Node Starts</h3>
<p>Run with --abort-on-uncaught-exception flag.</p>
</div>
<div class="step">
<h3>Step 2: Exception Handler Set</h3>
<p>Node configures abort behavior for uncaught exceptions.</p>
</div>
<div class="step">
<h3>Step 3: Code Executes</h3>
<p>Your app runs normally.</p>
</div>
<div class="step">
<h3>Step 4: Uncaught Exception!</h3>
<p>An error occurs that isn't caught by try/catch.</p>
</div>
<div class="step">
<h3>Step 5: Abort Signal</h3>
<p>Node sends SIGABRT signal to itself.</p>
</div>
<div class="step">
<h3>Step 6: Core Dump Created</h3>
<p>OS generates core dump file with full memory state! 🎉</p>
</div>
</div>
</div>
</section>
<!-- Live Demo -->
<section class="section">
<h2 class="section-title">🎮 Interactive Demo</h2>
<div class="demo-container">
<div style="margin-bottom: 30px; text-align: center;">
<h4 style="margin-bottom: 15px;">See Crash Behaviors! 💥</h4>
<button class="demo-button" onclick="simulateNormal()">
<span>🔵</span>
<span>Normal Crash</span>
</button>
<button class="demo-button" onclick="simulateAbort()">
<span>💥</span>
<span>Abort Mode</span>
</button>
<button class="demo-button" onclick="simulateAnalysis()">
<span>🔍</span>
<span>Core Dump Analysis</span>
</button>
</div>
<div class="terminal" id="terminal">
<div class="terminal-line">
<span class="terminal-prompt">$</span>
<span style="color: var(--text-secondary);"> Ready to simulate crashes...</span>
</div>
</div>
</div>
</section>
<!-- Code Breakdown -->
<section class="section">
<h2 class="section-title">💻 Usage Examples</h2>
<div class="card">
<div class="tabs">
<button class="tab active" onclick="switchTab('basic')">Basic Usage</button>
<button class="tab" onclick="switchTab('production')">Production Setup</button>
<button class="tab" onclick="switchTab('analysis')">Analyzing Dumps</button>
<button class="tab" onclick="switchTab('alternatives')">Alternatives</button>
</div>
<div id="basic" class="tab-content active">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Basic Usage</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('basic-code')">📋 Copy</button>
</div>
<pre><code id="basic-code"><span class="code-comment"># Run with abort on uncaught exception</span>
node --abort-on-uncaught-exception app.js
<span class="code-comment"># When crash occurs:</span>
<span class="code-comment"># - Process aborts immediately</span>
<span class="code-comment"># - Core dump file created (core.PID)</span>
<span class="code-comment"># - Exit code 134 (SIGABRT)</span>
<span class="code-comment"># Check if core dumps are enabled (Linux/Mac):</span>
ulimit -c
<span class="code-comment"># If 0, enable with: ulimit -c unlimited</span></code></pre>
</div>
<div class="danger" style="margin-top: 15px;">
<strong>Important:</strong> Make sure core dumps are enabled on your system!
</div>
</div>
<div id="production" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Production Setup</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('production-code')">📋 Copy</button>
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<pre><code id="production-code"><span class="code-comment">// package.json</span>
{
<span class="code-string">"scripts"</span>: {
<span class="code-string">"start:prod"</span>: <span class="code-string">"node --abort-on-uncaught-exception app.js"</span>
}
}
<span class="code-comment"># Configure core dump location (Linux)</span>
<span class="code-comment"># /etc/sysctl.conf:</span>
kernel.core_pattern = /var/coredumps/core.%e.%p.%t
<span class="code-comment"># Set core dump size limit</span>
ulimit -c unlimited
<span class="code-comment"># Docker setup</span>
<span class="code-comment"># docker-compose.yml:</span>
services:
app:
ulimits:
core: -1 <span class="code-comment"># Unlimited core dumps</span>
volumes:
- ./coredumps:/coredumps</code></pre>
</div>
<div class="tip" style="margin-top: 15px;">
<strong>Pro Tip:</strong> Configure core dump location and rotation in production!
</div>
</div>
<div id="analysis" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Analyzing Core Dumps</h3>
<div class="code-block">
<div class="code-header">
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<div class="terminal-dot dot-green"></div>
</div>
<button class="copy-btn" onclick="copyCode('analysis-code')">📋 Copy</button>
</div>
<pre><code id="analysis-code"><span class="code-comment"># Install llnode for Node.js core dump analysis</span>
npm install -g llnode
<span class="code-comment"># Analyze core dump with llnode</span>
llnode node -c core.12345
<span class="code-comment"># Inside llnode:</span>
v8 bt <span class="code-comment"># Show JavaScript backtrace</span>
v8 print obj <span class="code-comment"># Print JavaScript object</span>
v8 findjsobjects <span class="code-comment"># Find all JS objects</span>
v8 findjsinstances <span class="code-comment"># Find instances of class</span>
<span class="code-comment"># Alternative: Use gdb (lower level)</span>
gdb node core.12345
bt <span class="code-comment"># Show C++ backtrace</span>
<span class="code-comment"># Extract info without interactive session</span>
llnode node -c core.12345 -e "v8 bt" > crash-report.txt</code></pre>
</div>
</div>
<div id="alternatives" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Alternative Approaches</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>
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<button class="copy-btn" onclick="copyCode('alternatives-code')">📋 Copy</button>
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<pre><code id="alternatives-code"><span class="code-comment">// Method 1: --abort-on-uncaught-exception (best for production)</span>
node --abort-on-uncaught-exception app.js
<span class="code-comment">// Method 2: process.abort() programmatically</span>
process.on(<span class="code-string">'uncaughtException'</span>, (err) => {
console.error(<span class="code-string">'Fatal error:'</span>, err);
process.abort(); <span class="code-comment">// Trigger core dump</span>
});
<span class="code-comment">// Method 3: Heapdump for memory issues</span>
<span class="code-keyword">const</span> heapdump = <span class="code-keyword">require</span>(<span class="code-string">'heapdump'</span>);
heapdump.writeSnapshot(<span class="code-string">'./heap.heapsnapshot'</span>);
<span class="code-comment">// Method 4: --inspect for live debugging</span>
node --inspect app.js <span class="code-comment">// Chrome DevTools</span>
<span class="code-comment">// Method 5: Error monitoring services</span>
<span class="code-comment">// Sentry, Rollbar, etc. for production monitoring</span></code></pre>
</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. Core Dumps Not Enabled</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> ulimit -c is 0, so no core dumps are generated
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Run <code>ulimit -c unlimited</code> before starting Node!
</div>
</div>
</div>
</div>
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>2. Disk Space Issues</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> Core dumps can be huge (GB+) and fill disk
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Configure core dump location and implement rotation!
</div>
</div>
</div>
</div>
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>3. Using in Development</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> Not needed in dev - just use --inspect instead
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Use --abort-on-uncaught-exception only in production/staging!
</div>
</div>
</div>
</div>
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>4. Not Analyzing Dumps</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> Generating dumps but never analyzing them
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Set up automated analysis with llnode or monitoring tools!
</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>Production only</strong> - Use this flag in production/staging, not development!
</div>
<div class="tip">
<strong>Enable core dumps</strong> - Always run <code>ulimit -c unlimited</code> first!
</div>
<div class="tip">
<strong>Configure location</strong> - Set kernel.core_pattern to control where dumps go!
</div>
<div class="tip">
<strong>Implement rotation</strong> - Core dumps are huge - set up automatic cleanup!
</div>
<div class="tip">
<strong>Use llnode</strong> - Best tool for analyzing Node.js core dumps!
</div>
<div class="tip">
<strong>Combine with monitoring</strong> - Use with error tracking services for alerts!
</div>
<div class="tip">
<strong>Docker setup</strong> - Configure ulimits in docker-compose.yml!
</div>
</div>
</section>
<!-- Quiz -->
<section class="section">
<h2 class="section-title">🎯 Knowledge Check Quiz</h2>
<div class="quiz-container">
<p style="margin-bottom: 30px; font-size: 1.1rem;">Test your understanding! 🧠</p>
<div class="quiz-question">
<h3>Question 1: What does this flag do?</h3>
<div class="quiz-options">
<div class="quiz-option" onclick="checkAnswer(this, false, 1)">A) Prevents all exceptions</div>
<div class="quiz-option" onclick="checkAnswer(this, true, 1)">B) Creates core dump on uncaught exception</div>
<div class="quiz-option" onclick="checkAnswer(this, false, 1)">C) Logs exceptions to file</div>
</div>
<div class="quiz-feedback" id="feedback1"></div>
</div>
<div class="quiz-question">
<h3>Question 2: What's a core dump?</h3>
<div class="quiz-options">
<div class="quiz-option" onclick="checkAnswer(this, false, 2)">A) A log file</div>
<div class="quiz-option" onclick="checkAnswer(this, true, 2)">B) A snapshot of memory at crash time</div>
<div class="quiz-option" onclick="checkAnswer(this, false, 2)">C) A backup of your code</div>
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<h3>Question 3: When should you use this?</h3>
<div class="quiz-options">
<div class="quiz-option" onclick="checkAnswer(this, false, 3)">A) Always in development</div>
<div class="quiz-option" onclick="checkAnswer(this, true, 3)">B) In production for post-mortem debugging</div>
<div class="quiz-option" onclick="checkAnswer(this, false, 3)">C) Never - it's dangerous</div>
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<!-- Summary Card -->
<section class="section">
<h2 class="section-title">📚 Quick Reference</h2>
<div class="cheat-sheet">
<h3 style="margin-bottom: 20px; font-size: 2rem;">Abort Exception Cheat Sheet! 🔖</h3>
<div class="cheat-grid">
<div class="cheat-item">
<h4>💥 Command</h4>
<p><code>node --abort-on-uncaught-exception app.js</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Generate core dump</p>
</div>
<div class="cheat-item">
<h4>📍 Purpose</h4>
<p>Post-mortem debugging</p>
<p style="font-size: 0.85rem; margin-top: 5px;">Analyze crashes</p>
</div>
<div class="cheat-item">
<h4>💾 Output</h4>
<p>core.PID file</p>
<p style="font-size: 0.85rem; margin-top: 5px;">Memory snapshot</p>
</div>
<div class="cheat-item">
<h4>🔧 Enable Dumps</h4>
<p><code>ulimit -c unlimited</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Before running</p>
</div>
<div class="cheat-item">
<h4>🔍 Analysis Tool</h4>
<p><code>llnode</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Node.js debugger</p>
</div>
<div class="cheat-item">
<h4>🏭 Best For</h4>
<p>Production debugging</p>
<p style="font-size: 0.85rem; margin-top: 5px;">Rare crashes</p>
</div>
<div class="cheat-item">
<h4>⚠️ Watch Out</h4>
<p>Large file sizes</p>
<p style="font-size: 0.85rem; margin-top: 5px;">Implement rotation</p>
</div>
<div class="cheat-item">
<h4>🎯 Exit Code</h4>
<p>134 (SIGABRT)</p>
<p style="font-size: 0.85rem; margin-top: 5px;">Abort signal</p>
</div>
</div>
</div>
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<p style="font-size: 1.2rem; margin-bottom: 20px;">You now understand <strong>--abort-on-uncaught-exception</strong>! 🚀</p>
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<span class="badge">💥 Crash Expert</span>
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