NestJS / Basic: modules and request contracts

NestJS β€” Basic: modules and request contracts

Connect controllers, providers, visibility, runtime input and lifecycle stages.

6 lessons Β· No account required

What you will learn

  • Explain composition and runtime token identity.
  • Distinguish validation, access policy and failure translation.

  1. Application architecture and adapter boundaries

    Place Nest modules and application services above the selected transport adapter and keep process startup explicit.

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  2. Controllers, routes and HTTP result contracts

    Translate transport input into domain calls and return a deliberate public representation without bypassing the framework response lifecycle.

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  3. Providers, tokens and constructor injection

    Connect capabilities through stable runtime tokens and keep construction separate from domain use.

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  4. Module visibility, exports and composition

    Make capability ownership explicit and share providers through deliberate module boundaries.

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  5. DTO validation, pipes and runtime values

    Build a runtime input contract instead of assuming TypeScript annotations validate incoming values.

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  6. Request lifecycle, guards, interceptors and filters

    Assign each cross-cutting concern to the correct stage and understand which failures bypass later work.

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