Node.js has become one of the most popular runtimes for building REST APIs, largely because of its non-blocking I/O model and the massive npm ecosystem. When you add TypeScript to the mix, you get the productivity of JavaScript with the safety net of static types.

Project Structure That Scales

A feature-based folder layout — where each domain owns its own routes, controllers, services, and types — is far easier to maintain at scale than a layer-based layout where all routes live in one folder.

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Structure your code around business domains, not technical layers.

Input Validation and Error Handling

Libraries like Zod or Joi let you define schemas that validate and parse request bodies at the boundary before data touches your business logic. Pair that with a centralised error handler middleware that normalises all error responses into a consistent shape.