GitHub - nock/openapi: @nock/openapi is a library for mocking HTTP requests based on OpenAPI 3.x specifications. It ensures your mocks align with your API contract, providing type safety and schema validation for both requests and responses. Inspired by OpenAPI-msw.

pnpm install @nock/openapi

import { loadOpenApiSpec } from "@nock/openapi";
import type { paths } from './fixtures/schema.ts'; // Generated wit openapi-typescript

it('should mock a response body according to OpenAPI spec', async () => {
  const spec = await loadOpenApiSpec<paths>(exampleSwagger, 'https://petstore3.swagger.io')

  spec.get('/store/order/123')
    .reply(200, { id: 123 }, {
      'Content-Type': 'application/json'
    });
  const response = await fetch('https://petstore3.swagger.io/store/order/123')


  expect(response.status).toBe(200)
  expect(await response.json()).toEqual({
    id: 123,
    petId: 198772,
    quantity: 7,
    shipDate: "2019-08-24T14:15:22Z",
    status: "approved",
    complete: true,
  })
})