Automating Data Operation APIs with koa-restql

koa-restql is an open‑source tool (GitHub, npm) that automatically generates RESTful CRUD APIs from Sequelize models, greatly reducing the amount of repetitive data‑operation code in backend development.

In typical backend projects, each database table may require four CRUD endpoints, and relationships multiply the number of required APIs, leading to thousands of endpoints and corresponding tests. This article explains how RestQL abstracts these operations.

Solution approach – By mapping database tables directly to HTTP routes, RestQL eliminates the need to manually implement data‑operation APIs. It follows standard RESTful conventions (GET, POST, PUT, DELETE) and supports both list and single‑resource routes.

Supported HTTP verbs

GET (Read), POST (Create), PUT (Create/Update), DELETE (Delete). For methods with a request body, POST and PUT can handle list (array/object) and single (object) payloads.

Usage

Install via npm: npm install koa-restql Then integrate into a Koa application:

const Koa = require('koa');
const RestQL = require('koa-restql');
let app = new Koa();
let restql = new RestQL(sequelize.models);
app.use(restql.routes());

Query string rules

Keys not starting with '_' become where conditions; keys starting with '_' are passed as top‑level Sequelize options (e.g., _limit → limit). Associations can be included using _include with an array of relation names.

Access control

Two methods: a middleware placed before RestQL routes, or configuring restql options on Sequelize associations (e.g., ignore: true or ignore: ['get']).

The article also provides reference links to Koa, Sequelize, and the koa‑restql repository.