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nextjs-data-access-layer

Build secure, reusable data access patterns with DTOs, taint checks, and colocated authorization in Next.js. Use when centralizing database queries, transforming raw data to DTOs, adding server-only guards, or preventing sensitive data from reaching Client Components.

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含まれるファイル(4)

  • SKILL.md2.2 KB
  • evals/evals.json2.3 KB
  • references/implementation.md613 B
  • references/patterns.md1.5 KB

SKILL.md(原文)

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Data Access Layer (DAL)

Priority: P1 (HIGH)

Centralize all data access (Database & External APIs) to ensure consistent security, authorization, and caching.

Workflow

  1. Create DAL module in services/ or lib/data.ts with import 'server-only'.
  2. Verify auth inside every DAL function using await auth().
  3. Transform raw DB/API data into DTOs before returning to components.
  4. Wrap with cache() from React to deduplicate requests within render cycle.
  5. Taint-check sensitive objects to prevent accidental client exposure.

See implementation examples

Implementation Guidelines

  • DTOs: Always transform raw data into plain objects. Never return ORM model instances.
  • Security: Use taintObjectReference or taintUniqueValue from experimental taint API to guard sensitive data.
  • Authorization: Colocate auth checks inside every DAL function. Never rely on UI layer.
  • Caching: Wrap DAL functions in cache() to deduplicate within single render.
  • Error Handling: Throw standardized errors (NotFoundError, UnauthorizedError) caught by error.tsx or notFound().

Limitations

  • Client Components cannot import DAL files. Use Server Actions or Route Handlers as bridges.

Anti-Patterns

  • No auth checks outside DAL: Auth verification must live inside DAL functions.
  • No raw ORM instances returned: Transform to plain DTO objects before returning.
  • No fetch('localhost/api') in Server Components: Call DAL functions directly.
  • No DAL imports in Client Components: Use Server Actions or Route Handlers as bridges.

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • transform

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