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16 best JavaScript Mock libraries in 2025

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by marketing.admin@openweaver.com dot icon Updated: Mar 12, 2023

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A mock object of a given class or interface is designed to simulate the behavior of the real object. Used to test the behavior of other objects that are dependent on this mock object. A mock object returns dummy data corresponding to some dummy input passed to it. Mock objects can be used as a replacement for real objects in unit testing, they often also record how they were used so that you can make assertions about this after the test has finished. In this kit, we will discuss the top 8 JavaScript Mock Open Source libraries that you can use in your testing project. nock - HTTP server mocking and expectations library for Node.js; sinon - Test spies, stubs and mocks for JavaScript; easy-mock - persistent service that generates mock data quickly.

nockby nock

JavaScript doticonstar image 12174 doticonVersion:v13.3.1doticon
License: Permissive (MIT)

HTTP server mocking and expectations library for Node.js

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            nockby nock

            JavaScript doticon star image 12174 doticonVersion:v13.3.1doticon License: Permissive (MIT)

            HTTP server mocking and expectations library for Node.js
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                      sinonby sinonjs

                      JavaScript doticonstar image 9309 doticonVersion:v4.2.2doticon
                      License: Others (Non-SPDX)

                      Test spies, stubs and mocks for JavaScript.

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                                sinonby sinonjs

                                JavaScript doticon star image 9309 doticonVersion:v4.2.2doticon License: Others (Non-SPDX)

                                Test spies, stubs and mocks for JavaScript.
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                                          easy-mockby easy-mock

                                          JavaScript doticonstar image 8898 doticonVersion:v1.6.0doticon
                                          License: Strong Copyleft (GPL-3.0)

                                          A persistent service that generates mock data quickly and provids visualization view.

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                                                    easy-mockby easy-mock

                                                    JavaScript doticon star image 8898 doticonVersion:v1.6.0doticon License: Strong Copyleft (GPL-3.0)

                                                    A persistent service that generates mock data quickly and provids visualization view.
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                                                              axios-mock-adapterby ctimmerm

                                                              JavaScript doticonstar image 3189 doticonVersion:v1.21.4doticon
                                                              License: Permissive (MIT)

                                                              Axios adapter that allows to easily mock requests

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                                                                        axios-mock-adapterby ctimmerm

                                                                        JavaScript doticon star image 3189 doticonVersion:v1.21.4doticon License: Permissive (MIT)

                                                                        Axios adapter that allows to easily mock requests
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                                                                                  redux-mock-storeby reduxjs

                                                                                  JavaScript doticonstar image 2478 doticonVersion:v1.5.3doticon
                                                                                  License: Permissive (MIT)

                                                                                  A mock store for testing Redux async action creators and middleware.

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                                                                                            redux-mock-storeby reduxjs

                                                                                            JavaScript doticon star image 2478 doticonVersion:v1.5.3doticon License: Permissive (MIT)

                                                                                            A mock store for testing Redux async action creators and middleware.
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                                                                                                      fetch-mockby wheresrhys

                                                                                                      JavaScript doticonstar image 1202 doticonVersion:v9.11.0doticon
                                                                                                      License: Permissive (MIT)

                                                                                                      Mock http requests made using fetch

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                                                                                                                fetch-mockby wheresrhys

                                                                                                                JavaScript doticon star image 1202 doticonVersion:v9.11.0doticon License: Permissive (MIT)

                                                                                                                Mock http requests made using fetch
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                                                                                                                          mock-fsby tschaub

                                                                                                                          JavaScript doticonstar image 865 doticonVersion:v5.2.0doticon
                                                                                                                          License: Others (Non-SPDX)

                                                                                                                          Configurable mock for the fs module

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                                                                                                                                    mock-fsby tschaub

                                                                                                                                    JavaScript doticon star image 865 doticonVersion:v5.2.0doticon License: Others (Non-SPDX)

                                                                                                                                    Configurable mock for the fs module
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                                                                                                                                              jest-fetch-mockby jefflau

                                                                                                                                              JavaScript doticonstar image 837 doticonVersion:3.0.0doticon
                                                                                                                                              License: Permissive (MIT)

                                                                                                                                              There is a mock for fetch

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                                                                                                                                                        jest-fetch-mockby jefflau

                                                                                                                                                        JavaScript doticon star image 837 doticonVersion:3.0.0doticon License: Permissive (MIT)

                                                                                                                                                        There is a mock for fetch
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                                                                                                                                                                  mock-socketby thoov

                                                                                                                                                                  JavaScript doticonstar image 741 doticonVersion:9.0.0doticon
                                                                                                                                                                  License: Permissive (MIT)

                                                                                                                                                                  Javascript mocking library for WebSockets and Socket.IO

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                                                                                                                                                                            mock-socketby thoov

                                                                                                                                                                            JavaScript doticon star image 741 doticonVersion:9.0.0doticon License: Permissive (MIT)

                                                                                                                                                                            Javascript mocking library for WebSockets and Socket.IO
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                                                                                                                                                                                      node-mocks-httpby howardabrams

                                                                                                                                                                                      JavaScript doticonstar image 609 doticonVersion:v1.10.0doticon
                                                                                                                                                                                      License: Others (Non-SPDX)

                                                                                                                                                                                      Mock 'http' objects for testing Express routing functions

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                                                                                                                                                                                                node-mocks-httpby howardabrams

                                                                                                                                                                                                JavaScript doticon star image 609 doticonVersion:v1.10.0doticon License: Others (Non-SPDX)

                                                                                                                                                                                                Mock 'http' objects for testing Express routing functions
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                                                                                                                                                                                                          react-mockby skidding

                                                                                                                                                                                                          JavaScript doticonstar image 369 doticonVersion:Currentdoticon
                                                                                                                                                                                                          License: Permissive (MIT)

                                                                                                                                                                                                          Declarative mocks for React state and global APIs

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                                                                                                                                                                                                                    react-mockby skidding

                                                                                                                                                                                                                    JavaScript doticon star image 369 doticonVersion:Currentdoticon License: Permissive (MIT)

                                                                                                                                                                                                                    Declarative mocks for React state and global APIs
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                                                                                                                                                                                                                              jest-localstorage-mockby clarkbw

                                                                                                                                                                                                                              JavaScript doticonstar image 289 doticonVersion:v2.3.0doticon
                                                                                                                                                                                                                              License: Permissive (BSD-3-Clause)

                                                                                                                                                                                                                              A module to mock window.localStorage and window.sessionStorage in Jest

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                                                                                                                                                                                                                                        jest-localstorage-mockby clarkbw

                                                                                                                                                                                                                                        JavaScript doticon star image 289 doticonVersion:v2.3.0doticon License: Permissive (BSD-3-Clause)

                                                                                                                                                                                                                                        A module to mock window.localStorage and window.sessionStorage in Jest
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                                                                                                                                                                                                                                                  vuex-mock-storeby posva

                                                                                                                                                                                                                                                  JavaScript doticonstar image 271 doticonVersion:0.0.8doticon
                                                                                                                                                                                                                                                  License: Permissive (MIT)

                                                                                                                                                                                                                                                  ✅Simple and straightforward Vuex Store mock for vue-test-utils

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                                                                                                                                                                                                                                                            vuex-mock-storeby posva

                                                                                                                                                                                                                                                            JavaScript doticon star image 271 doticonVersion:0.0.8doticon License: Permissive (MIT)

                                                                                                                                                                                                                                                            ✅Simple and straightforward Vuex Store mock for vue-test-utils
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                                                                                                                                                                                                                                                                      ioredis-mockby stipsan

                                                                                                                                                                                                                                                                      JavaScript doticonstar image 289 doticonVersion:v8.6.0doticon
                                                                                                                                                                                                                                                                      License: Permissive (MIT)

                                                                                                                                                                                                                                                                      Emulates ioredis by performing all operations in-memory.

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                                                                                                                                                                                                                                                                                ioredis-mockby stipsan

                                                                                                                                                                                                                                                                                JavaScript doticon star image 289 doticonVersion:v8.6.0doticon License: Permissive (MIT)

                                                                                                                                                                                                                                                                                Emulates ioredis by performing all operations in-memory.
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                                                                                                                                                                                                                                                                                          node-mock-serverby smollweide

                                                                                                                                                                                                                                                                                          JavaScript doticonstar image 236 doticonVersion:0.25.4doticon
                                                                                                                                                                                                                                                                                          License: Permissive (MIT)

                                                                                                                                                                                                                                                                                          File based Node REST API mock server

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                                                                                                                                                                                                                                                                                                    node-mock-serverby smollweide

                                                                                                                                                                                                                                                                                                    JavaScript doticon star image 236 doticonVersion:0.25.4doticon License: Permissive (MIT)

                                                                                                                                                                                                                                                                                                    File based Node REST API mock server
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                                                                                                                                                                                                                                                                                                              mock-knexby jbrumwell

                                                                                                                                                                                                                                                                                                              JavaScript doticonstar image 230 doticonVersion:v0.4.12doticon
                                                                                                                                                                                                                                                                                                              License: Permissive (MIT)

                                                                                                                                                                                                                                                                                                              A mock knex adapter for simulating a database during testing

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                                                                                                                                                                                                                                                                                                                        mock-knexby jbrumwell

                                                                                                                                                                                                                                                                                                                        JavaScript doticon star image 230 doticonVersion:v0.4.12doticon License: Permissive (MIT)

                                                                                                                                                                                                                                                                                                                        A mock knex adapter for simulating a database during testing
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