JSON REST API

A JSON:API library and mini-ORM for Node.js 24+. Define resources once, call them directly from application code, or expose them through HTTP connectors. It supports relationships, filtering, sorting, pagination, managed transactions and file uploads.

Official Website

Features

• JSON:API Endpoints - Resource documents, relationship linkage, includes, and sparse fields
• Relationship Support - belongsTo, hasMany, and many-to-many relationships, including polymorphic
• Advanced Querying - Filtering, sorting, pagination, and field selection (sparse fieldsets)
• Server-Side Row Policies - Apply mandatory visibility rules before pagination, counts, and relationship loading
• File Uploads - File handling with local storage and custom storage adapters
• Framework Agnostic - Includes Express and Fastify connectors
• Validation - Schema-based validation with detailed error messages and custom rules
• Plain Records - Write plain values with data or JSON:API documents with document; choose output independently with format
• Extensible - Resource methods, sequential hooks and explicit plugin installation

Installation

Requires Node.js 24 or newer. Development and CI test Node 24 only; .nvmrc pins the current verification baseline.

npm install json-rest-api knex better-sqlite3 express

Quick Start

import { JsonRestApi, RestApiPlugin, RestApiKnexPlugin, ExpressPlugin } from 'json-rest-api';
import knexLib from 'knex';
import express from 'express';

// Create a Knex instance connected to SQLite in-memory database
const knex = knexLib({
  client: 'better-sqlite3',
  connection: {filename: ':memory:' }
});

// Create API instance
const api = new JsonRestApi({ name: 'book-catalog-api' });

// Install plugins
await api.use(RestApiPlugin);
await api.use(RestApiKnexPlugin, { knex });
await api.use(ExpressPlugin, { mountPath: '/api' }); // Express connector


// Define an authors resource
await api.addResource('authors', {
  schema: {
    name: { type: 'string', required: true, max: 100, search: true },
    surname: { type: 'string', required: true, max: 100, search: true },
  },
});
await api.resources.authors.createKnexTable();

// Run the server
const app = express();
api.http.express.mount(app);
app.listen(3000, () => {
  console.log('Express server started on port 3000. API available at http://localhost:3000/api');
}).on('error', (err) => {
  console.error('Failed to start server:', err);
  process.exit(1)
});

// Your API is ready! Try:
// GET http://localhost:3000/api/authors
// POST http://localhost:3000/api/authors

Documentation

The API migration guide describes the breaking v2 API changes and the steps for upgrading applications.

• Quick Start - Quick start
• Complete guide - Comprehensive guide
• API Reference - API reference
• Backend capabilities and limits - Databases, precision, migrations, transactions and storage gaps

Development

See contributing for setup, focused checks, native database verification and releases. Architecture maps the main execution paths. Test fixture conventions live in tests/README.md in a source checkout.

nvm use
npm ci
npm run verify

The full gate includes types, package contracts, query budgets, both SQLite storage suites, Express 4, lint and the documentation build. Native database, Redis and fresh-install checks are separate commands described in contributing. Use npm run docs:dev -- --no-open to serve the documentation locally.

License

Choose either the MIT license or the GNU GPL version 3 or later. See LICENSE for the dual-license notice. Dependencies retain their own licenses.