Backend
Node API Basics with Express (secure and friendly)
Learn how to set up an Express API with routing, validation, middlewares, and clean error handling so clients get consistent responses.
Start with structure
Organize routes, controllers, and services early. Keep each file short and focused.
Validate inputs
Never trust request bodies. Use a small schema validator, return helpful messages, and avoid leaking stack traces in production.
Secure defaults
Enable CORS only where needed, set helmet headers, and limit payload sizes to avoid unexpected memory use.