api-hardening

Harden REST endpoints with rate limiting, input validation, CORS, and API keys.

359|61|Updated Dec 25, 2025

Search Tags:#security #serverless #fastapi #validation #express #cors #api hardening

Ready to run

npx skills add https://github.com/jamditis/claude-skills-journalism --skill api-hardening

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: api-hardening
Source: https://github.com/jamditis/claude-skills-journalism/tree/main/api-hardening
Command: npx skills add https://github.com/jamditis/claude-skills-journalism --skill api-hardening

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

API hardening patterns to defend REST APIs from abuse, data leakage, and injection attacks across common runtimes.

Core Features & Use Cases

Rate limiting, input validation, CORS configuration, API key management, and secure error handling for Express, FastAPI, and serverless architectures.
Use cases include protecting public APIs, microservices, and admin endpoints in web apps, with defense-in-depth guidance and best practices.
Practical code patterns, configuration examples, and security checklists to harden services in production.

Quick Start

Implement a basic rate limiter in Express, add input validation in FastAPI with a sample schema, and enable strict CORS and security headers across environments.

Frequently Asked Questions about api-hardening

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

FAQPage Schema

How do I implement rate limiting and input validation for a FastAPI REST endpoint?▼

To implement API hardening in FastAPI, apply rate limiting middleware and define strict schema validation for input payloads. This prevents abuse and rejects malformed requests before processing, ensuring defense-in-depth for your REST endpoints.

What is API hardening and when do I need it for my serverless deployment?▼

API hardening secures REST endpoints against abuse, data leakage, and injection attacks. You need it for serverless deployments when exposing public APIs or microservices, applying defense-in-depth through rate limiting, CORS, and secure error handling.

Does this API hardening approach work with both Express and FastAPI runtimes?▼

Yes, this API hardening approach works with Express, FastAPI, and serverless architectures. It provides practical code patterns, configuration samples, and best practices for rate limiting, CORS, API keys, and error handling across these specific runtimes.

What's the best way to configure CORS and API key management for Express APIs?▼

The best way to configure CORS and API key management in Express is using strict environment configurations and defense-in-depth patterns. This API hardening approach prevents unauthorized cross-origin requests and secures endpoint access via valid keys.

How do I prevent data leakage through secure error handling in REST APIs?▼

To prevent data leakage via secure error handling in REST APIs, apply configuration samples that sanitize error responses. This API hardening technique ensures sensitive stack traces or internal data are not exposed to clients during failures.