Does it handle generic internal server errors?

Yes, it includes a generic exception handler that maps unhandled exceptions to a structured 500 error, preventing sensitive stack traces from leaking to clients.

What is the difference between RFC 7807 and RFC 9457?

RFC 9457 is the current active standard that obsoletes RFC 7807. It adds explicit support for multiple problems, an IANA error registry, and clearer rules for extension fields.

How does this skill improve FastAPI applications?

It provides pre-built exception handlers that automatically catch standard Python exceptions and convert them into standardized 'application/problem+json' responses.

Can I add custom fields to the error responses?

Yes, the provided Pydantic schemas use 'extra: allow' configuration, enabling you to include machine-readable context like trace IDs, field-specific validation errors, or retry hints.

RFC 9457 API Error Handling

Name: RFC 9457 API Error Handling
Author: yonatangross

byyonatangross

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API Development

Standardizes HTTP API error responses using the machine-readable RFC 9457 Problem Details format for FastAPI and backend services.

This skill provides production-ready patterns for implementing RFC 9457 (the successor to RFC 7807) Problem Details, ensuring your APIs return consistent, machine-readable error responses. It includes Pydantic schemas, custom FastAPI exception classes, and specialized handlers for common scenarios like validation failures, resource lookups, and rate limiting. By centralizing error definitions through a structured registry and discouraging inconsistent formats, it significantly improves API observability and the developer experience for frontend consumers and system integrators.

Key Features

01Centralized error type registry for consistent API documentation

02Production-grade FastAPI exception handlers and Pydantic schemas

03Pre-configured patterns for validation, 404, and rate-limit errors

04Support for custom extension fields in error responses

0529 GitHub stars

06Implementation of RFC 9457 (latest Problem Details standard)

Use Cases

01Implementing machine-readable validation messages for complex frontend forms

02Migrating legacy RFC 7807 error formats to the current industry standard

03Standardizing error responses across a distributed microservices architecture

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add yonatangross/skillforge-claude-plugin error-handling-rfc9457

For use in Claude.ai and ChatGPT

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