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Backend Foundations: API Contracts & First Catalog Endpoint

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Overview

Set up a consistent API contract, reusable request/response helpers, and your first e-commerce endpoint. You’ll learn Remix’s resource route model (API endpoints implemented via loader/action) and establish the foundation that every other endpoint will reuse.

Syllabus

Unit 1: Building Remix Backend Foundations

Observe the standard API response envelope in a Remix resource route
Implement ApiSuccess/ApiError and the ApiResponse union
Implement success(), error(), and parseJson() helpers
Return consistent envelopes from /api/debug/\* and /api/products

Unit 2: Validating Domain Models

Observe query param validation and the product domain model
Write isUUID, isString, isInt, and isEnum
Implement parseOptionalIntParam() with bounds and good messages
Validate query/page/pageSize and return an empty Product[] envelope

Unit 3: Wiring PostgreSQL Products

Observe route -> service -> repo -> database wiring
Create the pool singleton, query helper, and transaction helper
Implement isPostgresError/mapPostgresError and ok()/fail()
Implement searchProducts, listProducts, and the /api/products loader

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