Node.js / Intermediate: application boundaries

Node.js β€” Intermediate: application boundaries

Design validated APIs, owned error paths, meaningful tests, bounded streams, persistence contracts, and resource authorization.

6 lessons Β· No account required

What you will learn

  • API contracts and validation
  • Error boundaries and cancellation
  • Testing behavior with core tools
  • Streams and backpressure
  • Persistence, transactions, and idempotency
  • Authentication and authorization concepts

  1. API contracts and validation

    Define a small API boundary that distinguishes transport syntax, data validation, and domain rules before changing state.

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  2. Error boundaries and cancellation

    Preserve useful causes, classify expected failures, and make cancellation part of the operation contract.

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  3. Testing behavior with core tools

    Choose useful assertions, isolate side effects, and test asynchronous failure paths without external services.

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  4. Streams and backpressure

    Process bounded chunks, preserve failure propagation, and respect a consumer that is slower than its producer.

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  5. Persistence, transactions, and idempotency

    Separate repository behavior from transport and reason about concurrent updates, atomic changes, and repeated commands.

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  6. Authentication and authorization concepts

    Separate identity from permission, protect credentials, and reason about sessions without inventing a production authentication protocol.

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