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error-handling

Standardize Node.js error handling with Express middleware and custom error classes.

2|Updated Nov 18, 2025
Search Tags:#monitoring#node.js#robustness#error-handling#express#exception-handling
One-click install
npx skills add https://github.com/pluginagentmarketplace/custom-plugin-nodejs --skill error-handling-pluginagentmarketplace
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: error-handling
Source: https://github.com/pluginagentmarketplace/custom-plugin-nodejs/tree/main/skills/error-handling
Command: npx skills add https://github.com/pluginagentmarketplace/custom-plugin-nodejs --skill error-handling-pluginagentmarketplace

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires yaml, and includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

This Skill provides a structured approach to implementing robust error handling in Node.js applications, reducing downtime and improving user feedback.

Core Features & Use Cases

  • Custom error classes (AppError, ValidationError, NotFoundError, UnauthorizedError, ForbiddenError) to standardize error behavior.
  • Async and sync error handling patterns, including an async route wrapper to propagate errors cleanly.
  • Centralized Express middleware for consistent API error responses and better observability.
  • Process-level resilience: handling uncaught exceptions, unhandled rejections, and graceful shutdown.

Quick Start

Integrate the provided error-handling patterns into your Node.js project to wire in the error classes and Express middleware for centralized error processing.

Frequently Asked Questions about error-handling

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I handle unhandled promise rejections and uncaught exceptions in Node.js?▼

Process-level resilience in Node.js requires capturing uncaught exceptions and unhandled rejections to trigger graceful shutdowns, preventing unexpected application crashes and improving overall reliability.

What is the best way to standardize API error responses in Express?▼

The best way to standardize API error responses in Express is by implementing centralized error-handling middleware alongside custom error classes like AppError and ValidationError to ensure consistent structured codes.

How do I avoid unhandled rejections in async Express route handlers?▼

Avoid unhandled rejections in async Express route handlers by using an async route wrapper that catches promise rejections and cleanly propagates them to centralized error-processing middleware.

Does this error handling approach work for Node.js microservices and background jobs?▼

Yes, this error handling pattern applies to Express-based REST APIs, microservices, and background jobs, providing consistent error responses, structured codes, and robust monitoring across services.

Why do I need custom error classes like AppError and NotFoundError in Node.js?▼

You need custom error classes like AppError and NotFoundError in Node.js to standardize error behavior, differentiate operational errors from programmer errors, and generate consistent API responses.

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