A zero-config CLI tool that generates framework-specific error handling middleware and custom error classes for modern web applications.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install error-handler-gen
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install error-handler-gen using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Error Handler Generator?
The Error Handler Generator is a specialized utility designed to automate the creation of robust error handling architectures. As a key component in the Openclaw Skills library, it allows developers to instantly produce custom error classes like NotFoundError and ValidationError, along with the necessary middleware to catch and process these errors across various frameworks. This tool ensures that your API responses remain consistent, secure, and professional without the manual overhead of writing boilerplate code.
By leveraging this skill, developers can implement industry best practices such as async promise rejection catching and HTTP status code standardization. It integrates seamlessly into existing workflows, providing a standardized approach to error management that is essential for scalable and maintainable applications using Openclaw Skills.
Error Handler Generator Use Cases
- Starting a new API project and needing an immediate, robust error handling layer
- Standardizing error response shapes across a microservices architecture
- Enhancing security by ensuring stack traces are never leaked in production
- Adding structured error logging to an existing codebase
- Implementing custom error classes to handle specific business logic failures
How Error Handler Generator Works
- The developer initiates the process by running a simple command via npx, specifying the target framework.
- The skill identifies the optimal middleware pattern for the chosen environment (e.g., Express, Fastify, or Next.js).
- It generates a suite of custom error classes that extend the base Error class for specific HTTP scenarios.
- An asynchronous wrapper is created to intercept promise rejections and route them to the error middleware.
- The resulting code is outputted directly to the terminal or a specified file, ready for immediate integration into the Openclaw Skills development cycle.
Error Handler Generator Setup
To get started with the Error Handler Generator, ensure you have Node.js 18 or higher installed. This tool requires an OPENAI_API_KEY to be configured in your environment variables. No permanent installation is required as it can be run via npx.
# Generate middleware for Express
npx ai-error-handler express
# Generate middleware for Next.js in TypeScript
npx ai-error-handler nextjs -o lib/errors.ts
# View all available options
npx ai-error-handler --help
Error Handler Generator Data Schema & Taxonomy
The Error Handler Generator produces a structured set of files and logic based on the framework selected within the Openclaw Skills environment:
| Component | Purpose | Details |
|---|---|---|
| Middleware | Request Interceptor | Handles the (err, req, res, next) lifecycle |
| Error Classes | Type-safe Exceptions | Defines status codes and custom message shapes |
| Async Wrapper | Promise Handling | Automatically catches errors in async route handlers |
| Response Shape | JSON Formatting | Standardizes the { error: string, code: number } structure |
Error Handler Generator Advanced Features
- Multi-framework support including Express, Fastify, Koa, and Next.js
- Automatic language detection or manual override for JavaScript and TypeScript
- Custom output path configuration for seamless project integration
- Production-ready safety features to prevent sensitive data leakage
- Compatible with the broader LXGIC Dev Toolkit and Openclaw Skills ecosystem
SKILL.md
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