Writing SELECT, INSERT, UPDATE, and DELETE queries is not the difficult part of a CRUD API. The difficulty begins when every route starts handling SQL, input validation, HTTP status codes, and error formatting at the same time.
That version may work for five endpoints. It becomes unpleasant when you add authentication, pagination, related tables, or a second developer.
In this tutorial, we will build a Node.js REST API with Express and MySQL while keeping each responsibility in a predictable place. The result uses plain JavaScript, a small dependency set, prepared queries, a shared connection pool, request validation, and centralized error responses.
For a more detailed file-by-file walkthrough, including additional explanations and production considerations, see the original Node.js Express REST API CRUD tutorial with MySQL.
The API Contract Comes First
