skills.rest
lunaticwithaduck
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backend

Design backend APIs with authentication, validation, and error handling.

Updated Aug 23, 2026
Search Tags:#authentication#validation#backend#middleware#error-handling#nodejs#api-design
One-click install
npx skills add https://github.com/lunaticwithaduck/majstorbg --skill backend-lunaticwithaduck
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: backend
Source: https://github.com/lunaticwithaduck/majstorbg/tree/main/packages/.claude/skills/backend
Command: npx skills add https://github.com/lunaticwithaduck/majstorbg --skill backend-lunaticwithaduck

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Designing and maintaining robust backend services is complex, error-prone, and hard to scale without consistent patterns for REST APIs, authentication, middleware, validation, and error handling.

Core Features & Use Cases

  • Backend architecture guidance for Express, Fastify, GraphQL, and tRPC in Node.js.
  • Security & authentication patterns including JWT, OAuth, and RBAC.
  • Validation & error handling with structured responses and consistent error codes.
  • Performance & maintainability through middleware ordering, logging, and error boundaries.

Quick Start

Create a new Node.js API project using Express or Fastify, add a protected route with input validation and centralized error handling.

Frequently Asked Questions about backend

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

FAQPage Schema
How do I design a Node.js backend with secure authentication and validation?▼

To design a secure Node.js backend, implement structured input validation using Zod, apply JWT or OAuth authentication patterns, and configure middleware for consistent error handling across your API architecture.

What is the best way to handle errors consistently across REST, GraphQL, and tRPC APIs?▼

The best way to handle API errors consistently is to implement centralized error-handling middleware that standardizes error formats and codes, ensuring uniform responses across REST, GraphQL, and tRPC patterns.

Does this backend architecture guidance work with Fastify and NestJS?▼

Yes, the backend architecture guidance applies directly across Express, Fastify, and NestJS frameworks, covering middleware ordering, CORS concerns, and scalable maintainable API design patterns.

How do I structure scalable Node.js middleware for authentication and CORS?▼

To structure scalable Node.js middleware, carefully order your authentication checks, CORS configurations, and validation layers to ensure proper request processing and maintainable backend architecture.

Can I use Zod for structured validation in an Express or Fastify API?▼

Yes, you can use Zod for structured validation in your Express or Fastify API to enforce strict data typing, meet validation requirements, and prevent invalid inputs from reaching core logic.

Why does middleware ordering matter in Node.js backend architecture?▼

Middleware ordering matters in Node.js backend architecture because it dictates the request lifecycle, ensuring validation, authentication, and error boundaries execute correctly before routes process the payload.

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