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API Security Framework

$39

API authentication, rate limiting, input validation, CORS policies, and automated security testing for REST/GraphQL.

📁 29 files
MarkdownJavaScriptConfigPythonYAMLDjangoFlaskNginx

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📁 File Structure 29 files

api-security-framework/ ├── LICENSE ├── README.md ├── config/ │ ├── cors-policy.example.yaml │ └── nginx-security.conf ├── docs/ │ ├── api-security-testing-checklist.md │ ├── authentication-authorization.md │ ├── cors-and-headers.md │ ├── input-validation.md │ ├── rate-limiting.md │ └── secret-handling.md ├── examples/ │ ├── express_integration.js │ └── wsgi_demo.py ├── free-sample.zip ├── guide/ │ ├── 01-understanding-api-threat-models.md │ ├── 02-authentication-authorization-deep-dive.md │ ├── 03-rate-limiting-and-input-validation.md │ ├── 04-security-headers-cors-and-secret-handling.md │ └── 05-deployment-hardening-and-testing-checklist.md ├── index.html └── src/ ├── node/ │ ├── cors.js │ ├── jwt_verify.js │ ├── rate_limiter.js │ └── security_headers.js └── python/ ├── input_validation.py ├── jwt_auth.py ├── rate_limiter.py ├── secrets_loader.py └── security_headers.py

📖 Documentation Preview README excerpt

API Security Framework

Drop-in, dependency-free building blocks and the guidance to use them, for

securing an HTTP / REST API. Every control that usually gets bolted on too late --

authentication, authorization, rate limiting, input validation, CORS, security

headers, and secret handling -- is here as small, readable, unit-tested code in

both Python (standard library only) and Node.js (built-ins only), paired with

a focused guide and a copy-into-your-tracker testing checklist.

Nothing here needs pip install or npm install to run (the one exception is the

optional Express example, which is clearly marked). You can read every line,

drop a module into a service, and test it.

Table of Contents

1. [Who this is for](#who-this-is-for)

2. [What's included](#whats-included)

3. [Quick start](#quick-start)

4. [How the pieces fit together](#how-the-pieces-fit-together)

5. [File-by-file guide](#file-by-file-guide)

6. [Design principles](#design-principles)

7. [Using it in your stack](#using-it-in-your-stack)

8. [FAQ](#faq)

9. [License](#license)

10. [Support](#support)

Who this is for

  • Backend / API engineers who want correct, copy-pasteable implementations of

the security controls every API needs.

  • Security engineers reviewing or hardening an API and looking for a reference

for "what good looks like".

  • Tech leads standardizing auth, rate limiting, and headers across services.
  • Learners who want to understand JWT verification, CORS, and rate limiting

by reading short, honest code rather than a 10,000-line library.

Assumes working knowledge of HTTP and either Python or JavaScript. No prior

security specialization required -- the docs explain the why.

What's included

AreaDocsPython (stdlib)Node (built-ins)
Authentication / authorization (JWT, OAuth2)authentication-authorization.mdjwt_auth.pyjwt_verify.js
Rate limiting & abuse preventionrate-limiting.mdrate_limiter.pyrate_limiter.js
Input validation & output handlinginput-validation.mdinput_validation.py—
CORS & security headerscors-and-headers.mdsecurity_headers.pycors.js, security_headers.js
Secret handlingsecret-handling.mdsecrets_loader.py—
Testingapi-security-testing-checklist.mdexamples/wsgi_demo.pyexamples/express_integration.js

Plus reverse-proxy hardening (config/nginx-security.conf), a CORS policy file

(config/cors-policy.example.yaml), and a placeholder .env.example.

... continues with setup instructions, usage examples, and more.

📄 Code Sample .js preview

examples/express_integration.js'use strict'; /** * Express integration example wiring the framework's middlewares together. * * This is illustrative app code (it `require`s express, which you install with * `npm install express`). The security middlewares themselves * (security_headers.js, cors.js, rate_limiter.js, jwt_verify.js) have NO * dependencies. Run with: node examples/express_integration.js (after npm i). */ const express = require('express'); const securityHeaders = require('../src/node/security_headers'); const cors = require('../src/node/cors'); const { TokenBucketLimiter } = require('../src/node/rate_limiter'); const { verify, requireScope, JwtError } = require('../src/node/jwt_verify'); const app = express(); app.use(express.json({ limit: '64kb' })); // bound the body size (input-validation.md) // 1) Security headers on every response (defense in depth with your proxy). app.use(securityHeaders()); // 2) Allow-list CORS -- only these browser origins may call the API. app.use(cors({ allowedOrigins: ['https://app.example.com'], allowCredentials: true, })); // 3) Per-caller rate limiting. Key on the API key/user when present, else IP. const limiter = new TokenBucketLimiter(10, 5); // burst 10, 5/sec app.use((req, res, next) => { const key = req.headers['x-api-key'] || req.ip; const decision = limiter.check(key); if (!decision.allowed) { res.set('Retry-After', String(decision.retryAfterSeconds)); return res.status(429).json({ error: 'rate limited' }); } res.set('X-RateLimit-Remaining', String(decision.remaining)); return next(); });
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