API Response Conventions

Enforce JSON error and message keys for API response schemas.

63|9|Updated Jun 15, 2025
One-click install
npx skills add https://github.com/willdady/platypus --skill api-response-conventions
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: API Response Conventions
Source: https://github.com/willdady/platypus/tree/main/.claude/skills/api-conventions
Command: npx skills add https://github.com/willdady/platypus --skill api-response-conventions

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill eliminates inconsistency in API response structures, ensuring that all endpoints follow a predictable format for error handling and success messaging.

Core Features & Use Cases

  • Standardized Error Handling: Enforces the use of the error key for all 4xx and 5xx status codes.
  • Consistent Success Messages: Mandates the use of the message key for 2xx status responses.
  • Use Case: When developing new endpoints, use this Skill to verify that your response objects align with project standards, preventing integration issues for frontend consumers.

Quick Start

Apply the API response conventions to the current codebase to ensure all error and success responses follow the required JSON structure.

Frequently Asked Questions about API Response Conventions

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

FAQPage Schema
How do I standardize API error and success responses in TypeScript?

To standardize API responses in TypeScript, enforce specific JSON keys across all HTTP status codes: use an error key for 4xx and 5xx states, and a message key for 2xx success responses. This ensures consistent interface contracts for backend development and automated testing.

What is the best way to enforce consistent JSON response schemas for backend APIs?

Enforcing consistent JSON response schemas requires mandating specific keys for different HTTP status codes. Apply standardized conventions like using an error key for 4xx and 5xx responses, and a message key for 2xx responses, ensuring predictable interface contracts for frontend consumers.

How do I verify that my API endpoints follow standard JSON response conventions?

Verify API endpoints follow standard JSON response conventions by checking that all response objects adhere to defined key structures. Validate that 4xx and 5xx status codes use an error key, while 2xx success states use a message key, preventing frontend integration issues.

Does this API response standardization approach work with automated testing workflows?

Yes, API response standardization works with automated testing workflows by applying predictable JSON schemas. Test scripts can reliably assert the presence of specific error keys for failure statuses and message keys for success statuses across all endpoint responses.

Why do I need standardized JSON keys for different HTTP status codes?

Standardized JSON keys for HTTP status codes are needed to eliminate inconsistency in API response structures. By enforcing an error key for 4xx and 5xx codes, and a message key for 2xx codes, frontend consumers receive predictable data formats.