middleware-patterns

Provides standardized Express middleware for authentication, validation, logging, and more.

1|Updated Jan 4, 2026

Search Tags:#authentication #logging #validation #middleware #error-handling #rate-limiting #express

Ready to run

npx skills add https://github.com/karchtho/my-claude-marketplace --skill middleware-patterns-karchtho

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: middleware-patterns
Source: https://github.com/karchtho/my-claude-marketplace/tree/main/bundles/express-backend-bundle/skills/middleware-patterns
Command: npx skills add https://github.com/karchtho/my-claude-marketplace --skill middleware-patterns-karchtho

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Express apps often struggle with consistent, secure request handling across routes. This Skill provides a reusable set of middleware patterns for authentication, validation, error handling, rate limiting, logging, CORS, and compression to standardize and harden API behavior.

Core Features & Use Cases

Authentication: verify tokens and enforce role-based access.
Validation: schema-based request validation to prevent invalid input.
Error Handling: centralized error management with user-friendly responses.
Observability: request logging and metrics for monitoring and debugging.
Cross-Cutting Concerns: easy composition of middleware stacks for protected, public, and admin routes.
Use cases include securing REST APIs, protecting endpoints, and ensuring consistent request handling across services.

Quick Start

Install or configure reusable middleware components and compose them into route handlers to accelerate secure API development.

Frequently Asked Questions about middleware-patterns

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

FAQPage Schema

How do I set up Express middleware for authentication and request validation?▼

To set up Express middleware for authentication and request validation, compose modular middleware stacks that verify tokens, enforce role-based access, and validate request schemas. This ensures secure, consistent API route handling across protected endpoints.

What is centralized error handling in Express APIs?▼

Centralized error handling in Express APIs is a middleware pattern that catches errors across routes and returns user-friendly responses. It standardizes error management by enforcing modular composition and safe defaults for robust API behavior.

Can I use these middleware patterns with TypeScript?▼

Yes, you can use these middleware patterns with TypeScript. The patterns enforce TypeScript compatibility, providing type-safe definitions for authentication, validation, logging, and rate limiting components when building Express API routes.

What's the best way to compose middleware stacks for different Express route types?▼

The best way to compose middleware stacks for different Express route types is applying modular composition to separate protected, public, and admin routes. This allows easy composition of cross-cutting concerns like rate limiting, logging, and CORS.

Why do I need rate limiting and logging middleware for my REST API?▼

You need rate limiting and logging middleware for your REST API to ensure observability and protect endpoints from abuse. These middleware patterns provide request logging, metrics for monitoring, and safe defaults to harden API behavior.

Does this middleware approach work for securing public and admin routes differently?▼

Yes, this middleware approach works for securing public and admin routes differently through modular composition. You can easily compose distinct middleware stacks applying authentication, validation, and role-based access controls tailored to each route type.