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CodeSignal

Backend Foundations: APIs, Utilities & Catalog Endpoint

via CodeSignal

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Overview

Set up a consistent API contract, reusable request/response helpers, and your first e-commerce endpoint. You'll learn the Next.js App Router API route model and establish the foundation that every other endpoint will reuse.

Syllabus

  • Unit 1: Standardizing API Responses
    • Observe the standard API response envelope
    • Create the ApiSuccess/ApiError contract
    • Implement success() and error() in response helpers
    • Add parseJson() and a POST debug handler
  • Unit 2: Validation and Domain Types
    • Observe validation helpers and product type shapes
    • Define Product domain and ListProductsInput DTO
    • Implement validation helpers for query params
    • Validate query, page, and pageSize in GET /api/products
  • Unit 3: Wiring PostgreSQL Products
    • Observe database wiring and products listing flow
    • Implement query() and withTransaction() in the DB client
    • Implement searchProducts() in productsRepo
    • Wire products service and route to return DB results

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