Dev servers and API mocking

12-month change compares the average of the last 4 weeks of downloads with the first 4 weeks of the 52-week series. Gzip size is for the whole package, as measured by Bundlephobia. "-" means the value has not been fetched.

• viteNative-ESM powered web dev build tool
• fast-checkProperty based testing framework for JavaScript (like QuickCheck)
• responselikeA response-like object for mocking a Node.js HTTP response stream
• http-proxy-middlewareThe one-liner node.js proxy middleware for connect, express, next.js and more
• @mswjs/interceptorsLow-level network interception library for Node.js.
• mswSeamless REST/GraphQL API mocking library for browser and Node.js.
• @vitejs/plugin-react-swcSpeed up your Vite dev server with SWC
• cross-inspectCross platform implementation of Node's util.inspect
• sponge-caseTransform into a string with random capitalization applied
• nockHTTP server mocking and expectations library for Node.js
• aws-sdk-client-mockEasy and powerful mocking of AWS SDK v3 Clients
• msw-storybook-addonMock APIs in Storybook using Mock Service Worker.
• jest-canvas-mockMock a canvas in your jest tests.
• browser-tabs-lockprovides locking mechanism to sync across browser tabs
• orvalA swagger client generator for typescript
• @copilotkit/aimockMock infrastructure for AI application testing — point your SDK at one local port and every provider, protocol, and service answers deterministically.
• vitest-canvas-mock🌗 A module used to mock canvas in Vitest.
• mock-socketJavascript mocking library for websockets and socket.io
• browser-syncLive CSS Reload & Browser Syncing
• browser-sync-uiUser Interface for BrowserSync
• graphql-toolsUseful tools to create and manipulate GraphQL schemas.
• rewireEasy dependency injection for node.js unit testing
• @jest-mock/expressA lightweight Jest mock for unit testing Express
• fetch-mock-cacheCaching mock fetch implementation for all runtimes and frameworks.
• mock-propertyGiven an object and a property, replaces a property descriptor (or deletes it), and returns a thunk to restore it.
• wxt⚡ Next-gen Web Extension Framework
• ng-mocksng-mocks simplifies Angular testing with mock dependencies, shallow rendering and less boilerplate. Mock components, services, directives, pipes and modules in Angular 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 with Jasmine, Jest or Vitest.
• mockttpMock HTTP server for testing HTTP clients and stubbing webservices
• aws-sdk-client-mock-jestCustom Jest matchers for AWS SDK v3 Client mock
• node-request-interceptorLow-level HTTP/HTTPS/XHR request interception library for NodeJS
• json-server[](https://github.com/typicode/json-server/actions/workflows/node.js.yml)
• @compodoc/live-serverSimple development http server with live reload capability
• xhr-mockletUtility for mocking XMLHttpRequests in the browser or nodejs.
• rolldown-viteVite on Rolldown preview
• pretenderPretender is a mock server library for XMLHttpRequest and Fetch, that comes with an express/sinatra style syntax for defining routes and their handlers.
• connect-livereloadconnect middleware for adding the livereload script to the response
• jest-localstorage-mockAuto mock all localstorage and sessionstorage APIs for your Jest tests
• miragejsA client-side server to help you build, test and demo your JavaScript app
• @web/config-loaderLoad a esm or cjs config from the file system
• jest-websocket-mockMock websockets and assert complex websocket interactions with Jest
• @web/parse5-utilsUtils for using parse5
• ts-mockitoMocking library for TypeScript
• @web/browser-logsCapture browser logs for logging in NodeJS
• xhr-mockUtility for mocking XMLHttpRequest.
• @msw/playwrightMock Service Worker binding for Playwright
• oauth2-mock-serverOAuth2 and OpenID Connect mock server for automated testing and development. Issues cryptographically signed JWTs via JWK key pairs. OIDC-conformant, exposes discovery, JWKS, authorization, token, userinfo, introspection, revocation, and end-session endpo
• @web/dev-server-rollupUse rollup plugins in @web/dev-server
• @web/dev-serverDev server for web applications
• @web/test-runner-coverage-v8Code coverage using v8
• fictionalGenerate fake data deterministically from a given input

• 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