mockr

Mock API server for frontend prototyping. Define endpoints with data, get full CRUD for free. Mock the routes you're building, proxy the rest to a real backend. WebSocket endpoints, scenarios, zod validation, and a Chrome extension that records traffic and maps it to local files.

Docs: https://yoyo-67.github.io/mockr/

Install

npm install @yoyo-org/mockr zod

Add "type": "module" to package.json. Run with npx tsx mock.ts — no build step.

Quick example

import { mockr } from '@yoyo-org/mockr';

await mockr({
  port: 4000,
  endpoints: [
    { url: '/api/todos', data: [{ id: 1, title: 'Buy milk', done: false }] },
  ],
});

GET /api/todos returns the array. POST inserts. PATCH /api/todos/1 updates. DELETE /api/todos/1 removes. No glue code.

Where to next

• Concepts — the data-driven mental model
• Tutorial — eleven chapters, each a runnable example
• Reference — full API surface (handlers, WebSocket, recorder, CLI)
• Examples — copy-pasteable working servers

License

MIT