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Express.js error handling patterns including async error catching, custom error classes, centralized error middleware, and the distinction between operational and programmer errors. Use when the user is handling errors in Express, writing async route handlers, creating custom error types, or debugging unhandled rejections. Trigger on mentions of Express error handling, async errors, error middlewa
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Express Error Handling
Patterns for comprehensive, centralized error handling in Express.js applications.
When to Use
User is writing Express route handlers with async operations User needs custom error classes for different HTTP status codes User asks about centralized error handling User has unhandled promise rejections or uncaught exceptions User needs to distinguish between operational and programmer errors
Core Patterns
Custom Error Classes
Create a hierarchy of a
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