In her Oak Creek workshop, Jill Luhn and her husband make auto parts for performance cars. They've been doing it for 20 years. "Business is doing well," said Luhn, owner of Luhn Performance, Inc. "It ...
card-number-validation-api/ ├── src/ │ ├── index.ts # Express app and API endpoint │ ├── cardValidator.ts # Card validation logic (Luhn algorithm) │ ├── cardValidator.test.ts # Unit tests │ └── ...
I chose NestJS because of its modular architecture, dependency injection, and scalability for production backend services. Even for a small service, I wanted clear separation of concerns: Controller → ...
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