Dev servers and API mocking

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• mockserver-clientA node client for the MockServer
• mock-xmlhttprequestXMLHttpRequest mock for testing
• live-serversimple development http server with live reload capability
• testdoubleA minimal test double library for TDD with JavaScript
• browser-sync-webpack-pluginBrowserSync and Webpack integration
• @adonisjs/assemblerProvides utilities to run AdonisJS development server and build project for production
• storybook-addon-mock-dateStorybook addon that mocks the JavaScript Date — and opt-in Temporal and Intl.DateTimeFormat — for individual stories.
• openapi-backendBuild, Validate, Route, Authenticate and Mock using OpenAPI definitions. Framework-agnostic
• jest-launchdarkly-mockEasily unit test LaunchDarkly feature flagged components with jest
• mock-json-schemaSimple utility to mock example objects based on JSON schema definitions
• mocked-envEasy way to mock process.env during BDD testing
• moxiosMock axios requests for testing
• @msw/cloudflareMock API in Cloudflare with Mock Service Worker.
• vitest-websocket-mockMock websockets and assert complex websocket interactions with Vitest
• @msw/dataData querying library for testing JavaScript applications.
• esmockprovides native ESM import and globals mocking for unit tests
• moq.tsMoq library for Typescript inspired by c# moq
• casual-browserifyFake data generator (Browserify friendly)
• ts-mock-importsIntuitive mocking for Typescript class imports
• esmoduleserveServe ES modules over HTTP, rewriting imports
• @elastic/elasticsearch-mockMock utility for the Elasticsearch's Node.js client
• jest-useragent-mockMock `navigator.userAgent` when run unit test cases with jest.
• @web/dev-server-esbuildPlugin for using esbuild in @web/dev-server
• rewiremockAdvanced dependency mocking device.
• @automock/jest> [!WARNING] > ## Automock is Now Suites > > Automock has stopped at **version 2.1.0** and the project has been renamed to **Suites**, a more mature, actively > developed unit testing framework that extends and improves Automock's original design. > > ##
• scenario-mock-serverMock server powered by scenarios
• @kubb/plugin-mswGenerate Mock Service Worker (MSW) request handlers with Kubb. Intercept HTTP requests in the browser or Node.js for frontend development and testing.
• mock-match-mediamock window.matchMedia for tests or node
• msw-auto-mockGenerate random mock data from OpenAPI descriptions for msw.
• html-webpack-harddisk-pluginWrite html files to hard disk even when using the webpack dev server or middleware
• html-webpack-inline-source-pluginEmbed javascript and css source inline when using the webpack dev server or middleware
• mongodb-memory-server-globalMongoDB Server for testing (auto-download latest version to ~/.cache/mongodb-binaries).
• @web/rollup-plugin-copyRollup plugin which copies asset files while retaining the relative folder structure.
• electronmonwatch and reload your electron app the easy way
• ts-auto-mockTypescript transformer to unlock automatic mock creation for interfaces and classes
• inject-loaderA Webpack loader for injecting code into modules via their dependencies
• specmaticNode wrapper for Specmatic
• zod-schema-fakerGenerates mock data from zod schema. Powered by @faker-js/faker and randexp.js
• kubbThe meta framework for code generation. Point Kubb at a schema and it generates types, clients, hooks, validators, mocks, and more.
• jest-mock-vscodeVS Code Mock for jest
• @short.io/opensearch-mockMock utility for the Elasticsearch's Node.js client
• strong-mockType safe mocking library for TypeScript
• sinon-express-mockSimple request and response mock objects to pass into Express routes when testing using Sinon.
• vitest-mock-expressA lightweight Vitest mock for unit testing Express
• mountebankOver the wire test doubles
• muk-propMock object methods and properties.
• swagger-to-mockmock data generator from Swagger (OpenAPI 3)
• http-request-mockIntercept & mock http requests issued by XMLHttpRequest, fetch, nodejs https/http module, axios, jquery, superagent, ky, node-fetch, request, got or any other request libraries by intercepting XMLHttpRequest, fetch and nodejs native requests in low level.
• @storybook-community/storybook-addon-cookieSet document.cookie in your stories.
• rollup-plugin-workboxRollup plugin that builds a service worker with workbox as part of your rollup build

• msw vs json-server
• @copilotkit/aimock vs mock-socket
• mockttp vs ts-mockito
• mock-socket vs ts-mockito
• rewire vs ng-mocks
• msw vs miragejs
• mock-socket vs ng-mocks
• fast-check vs rewire