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<h4>3. Building an Actual API with Node.js HTTP Module</h4>
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<p>Understanding Node.js core <code>http</code> module helps you appreciate what frameworks like Express abstract away. This example builds a complete server with routing, template rendering, and an API endpoint from scratch.</p>
data-description="Example JSON error responses with consistent structure">// 404 Not Found Response
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{
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"error": {
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"status": 404,
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"message": "User not found",
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"details": null,
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"timestamp": "2025-12-26T10:30:00.000Z"
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}
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}
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// 422 Validation Error Response
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{
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"error": {
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"status": 422,
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"message": "Validation failed",
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"details": {
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"email": "Invalid email format",
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"age": "Must be at least 18"
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},
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"timestamp": "2025-12-26T10:30:00.000Z"
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}
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}
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</code></pre>
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</div>
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<h4>2. Centralized Error Handling Middleware</h4>
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<pclass="code-description">
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<strong>Problem solved:</strong> Catches all errors from routes in one place, ensuring consistent error responses and proper logging without duplicating code.
<p>Use custom media types in the Accept header to specify API version. Follows REST principles by treating different versions as different resource representations.</p>
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