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Prompt

What should I use to mock APIs for testing?

Technology / Testing & QA1 observationLast seen Oct 6, 2026

Latest observation

Oct 6, 2026OpenAI APIWeb search: off

It depends on what kind of testing you’re doing, but these are the most common options:

1) Mocking libraries inside your test suite

Use these when you want to fake API calls in unit/integration tests.

  • JavaScript/TypeScript

    • msw (Mock Service Worker) — great for API mocking at the network level
    • jest.mock() / vi.mock() — good for mocking modules/functions
    • nock — mocks HTTP requests in Node.js

  • Python

    • responses — for requests
    • httpx.MockTransport — for httpx
    • unittest.mock — for mocking client methods

  • Java

    • WireMock
    • MockWebServer (OkHttp)

  • .NET

    • Moq
    • WireMock.Net

2) API mocking tools/services

Use these if you want a standalone mock server.

  • WireMock — very popular, flexible, runs locally
  • Mockoon — easy GUI-based mock server
  • Postman Mock Server — convenient if your team already uses Postman
  • Prism — mocks from OpenAPI specs
  • Stoplight — design + mock APIs

3) Contract/spec-driven mocking

Best if you have an OpenAPI/Swagger spec and want mocks generated from it.

  • Prism
  • Stoplight
  • WireMock with OpenAPI support

Quick recommendation

  • For frontend tests: msw
  • For Node backend tests: nock or msw
  • For cross-language/local mock server: WireMock
  • For easy visual setup: Mockoon
  • For spec-based mocking: Prism

If you tell me your language/framework and whether you want unit tests, integration tests, or a local mock server, I can recommend the best fit.

Brands

MockoonPostmanStoplightWiremock

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