Api Documentation Template Nextjs

Standard Operating Procedure: API Documentation Template (Next.js)

1. Document Control & Revision History

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2. Executive Summary & Scope

This document mandates the standardization of API documentation within Next.js environments. The scope covers all server-side API routes (/pages/api or /app/api) and external integration interfaces. Compliance is required to ensure system interoperability, minimize technical debt, and satisfy SOC2/GDPR auditing standards regarding data contract transparency.

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3. Prerequisites & Tool Requirements

• Infrastructure: Node.js (Latest LTS), Next.js 13+ (App Router preferred).
• Documentation Engine: swagger-ui-react or next-swagger-doc integration.
• Validation: OpenAPI Specification (OAS) 3.0.x compliance.
• Access Requirements: Repository write access, elevated CI/CD pipeline privileges for documentation deployment.
• Environment: Development environment configured with .env.local strictly restricted from production deployment.

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4. Roles & Responsibilities (RACI Matrix)

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5. Step-by-Step Operational Procedure

Phase I: Dependency Configuration

• Initialize documentation library: npm install swagger-ui-react next-swagger-doc.
• Define swagger.json or swagger.yaml at the project root.
• Configure next.config.js to bypass static analysis for documentation build paths.

Phase II: Schema Integration

• Annotate API routes using JSDoc-style comments or external YAML definition files.
• Ensure all request payloads include explicit TypeScript interfaces.
• Enforce status code documentation (200, 400, 401, 403, 404, 500) for every route.

Phase III: Automated Rendering

• Create a static route /app/api-doc/page.tsx utilizing dynamic imports to prevent server-side bloat.
• Validate endpoint accessibility in localhost:3000/api-doc.

Phase IV: CI/CD Pipeline Integration

• Integrate linting step: npx swagger-cli validate swagger.yaml.
• Automate deployment of documentation to internal staging environment post-commit.

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6. Quality Assurance & Verification Criteria

• Audit Checklist:
  • Does the OAS file contain zero validation errors per swagger-cli?
  • Are all authentication headers (Bearer tokens) clearly defined?
  • Is the documentation excluded from production minification if sensitive?
• Tolerance Thresholds:
  • Documentation must achieve 100% coverage of public-facing endpoints.
  • Documentation build time must not exceed 5% of total application build time.
• Acceptance Benchmark: Zero "500 Internal Server Error" responses returned by the documentation engine during load testing.

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7. Practical Troubleshooting Scenarios

Scenario A: Documentation Mismatch (Definition-Implementation Drift)

• Symptom: UI displays successful response schema that does not match actual API NextApiResponse object.
• Corrective Action: Immediate audit of TypeScript interfaces. Update swagger.yaml to extend common schema types. Re-run validator.

Scenario B: Dynamic Build Failure

• Symptom: Module not found error during deployment due to dynamic import of Swagger UI.
• Corrective Action: Update next.config.js to add the documentation path to transpilePackages and verify ssr: false configuration for the documentation page component.

Scenario C: Unauthenticated Access to API Spec

• Symptom: API documentation exposed to public internet in a non-permitted environment.
• Corrective Action: Apply middleware.ts logic to gate access to the /api-doc route based on user roles or internal IP whitelisting. Immediately rotate API secret keys if documentation was exposed for >1 hour.