How to write about it — NestJS: organize an API with controllers, services and modules
Structure, tips and best practices for writing about this topic
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Structure a TypeScript backend without losing business rules inside HTTP handlers.
Recommended structure
- IntroductionStructure a TypeScript backend without losing business rules inside HTTP handlers.
- Controller: the entry pointA NestJS controller exposes routes such as GET /customers. It receives requests, delegates work and returns responses. Keep it thin: parsing an HTTP parameter differs from deciding whether a customer qualifies for a discount.
- Service: the business behaviorA service contains reusable behavior such as creating customers or calculating totals. Dependency injection supplies collaborators. This makes database adapters easier to replace in tests and lets several routes reuse the same business rules.
- Module: a feature boundaryA module groups related controllers and providers. Add validation, authorization and consistent errors. For a CRM, separate customers, sales and billing instead of creating one service that knows everything.
- ConclusionControllers handle HTTP, services implement rules and modules group features.
Angles to cover
Writing tips
- Start with a concrete problem your reader is facing
- Use real examples — abstract explanations lose readers quickly
- Break long paragraphs into scannable sections with clear headings
- End every section with an actionable insight, not just information
The essential point : Controllers handle HTTP, services implement rules and modules group features.
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