governing-error-responses

Name: governing-error-responses
Availability: InStock
Author: Musher

Enforce RFC 9457 Problem Details in API error response payloads.

Updated Mar 6, 2026

Search Tags:#api #error handling #fastapi #validation #problem details #rfc 9457

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npx skills add https://github.com/musher-dev/bundles --skill governing-error-responses

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Skill: governing-error-responses
Source: https://github.com/musher-dev/bundles/tree/main/api-route-governance/skills/governing-error-responses
Command: npx skills add https://github.com/musher-dev/bundles --skill governing-error-responses

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill ensures your API error responses are consistent, informative, and compliant with industry standards like RFC 9457, improving developer experience and simplifying error handling.

Core Features & Use Cases

RFC 9457 Compliance: Enforces the use of application/problem+json and required fields (type, title, status, detail, instance).
Structured Validation Errors: Provides a standardized errors array for field-level validation feedback.
FastAPI Integration: Offers guidance and code examples for mapping custom exceptions and overriding default FastAPI error handling.
Use Case: When designing a new API endpoint, use this Skill to ensure all potential error responses adhere to the Problem Details specification, making it easier for consumers to integrate and debug.

Quick Start

Use the governing-error-responses skill to review an API's error response payload for RFC 9457 compliance.

Frequently Asked Questions about governing-error-responses

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

FAQPage Schema

What is a Problem Details response in API error handling?▼

A Problem Details response is a standardized error payload format defined by RFC 9457 that enforces the application/problem+json content type and required fields like type, title, status, detail, and instance for consistent API errors.

How do I standardize FastAPI error responses using RFC 9457?▼

To standardize FastAPI error responses using RFC 9457, you map custom exceptions to FastAPI exception handlers and override default error handling to output application/problem+json payloads with required fields and an errors array.

How does the errors array extension work for field-level validation in Problem Details?▼

The errors array extension works by providing a structured array within the RFC 9457 Problem Details payload to deliver granular, field-level validation feedback alongside the standard top-level error fields.

When do I need application/problem+json for my API?▼

You need application/problem+json when designing API endpoints that require consistent, standards-compliant error responses, ensuring consumers receive required fields like status and detail for easier integration and debugging.

Can I override default FastAPI exception handlers to return RFC 9457 Problem Details?▼

Yes, you can override default FastAPI exception handlers by mapping custom exceptions to return application/problem+json responses, enforcing required fields and the errors array extension for validation feedback.

What's the best way to audit API error payloads for RFC 9457 compliance?▼

The best way to audit API error payloads for RFC 9457 compliance is to review responses against criteria that enforce the application/problem+json content type, required fields, and the structured errors array for validation.