Overview

fetch-mock is the most comprehensive library for mocking the fetch API.

It allows mocking http requests made using fetch or a library imitating its api, such as node-fetch.

It supports most JavaScript environments, including browsers, Node.js, web workers and service workers.

As well as shorthand methods for the simplest use cases, it offers a flexible API for customising all aspects of mocking behaviour.

For documentation for fetch-mock v11 and below visit the Legacy API docs

Examples

import fetchMock from 'fetch-mock';
fetchMock.mockGlobal().route('http://example.com', 200);
const res = await fetch('http://example.com');
assert(res.ok);

import fetchMock from 'fetch-mock';

fetchMock
  .mockGlobal()
  .route({
    express: '/api/users/:user'
    expressParams: {user: 'kenneth'}
  }, {
    userData: {
      email: '[email protected]'
    }
  }, 'userDataFetch');

const res = await fetch('http://example.com/api/users/kenneth');
assert(fetchMock.called('userDataFetch'))
const data = await res.json();
assertEqual(data.userData.email, '[email protected]')

Examples​

Examples