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fetch-mock
Advanced tools
Mock http requests made using fetch (or isomorphic-fetch)
fetch-mock is a library for mocking HTTP requests made using the Fetch API. It allows developers to simulate different responses and behaviors for fetch calls, which is particularly useful for testing and development purposes.
Mocking a simple GET request
This feature allows you to mock a simple GET request. The code sample demonstrates how to mock a GET request to 'https://api.example.com/data' and return a JSON object with sample data.
const fetchMock = require('fetch-mock');
fetchMock.get('https://api.example.com/data', { data: 'sample data' });
fetch('https://api.example.com/data')
.then(response => response.json())
.then(data => console.log(data));
Mocking a POST request with specific body
This feature allows you to mock a POST request with a specific request body. The code sample demonstrates how to mock a POST request to 'https://api.example.com/submit' and return different responses based on the request body.
const fetchMock = require('fetch-mock');
fetchMock.post('https://api.example.com/submit', (url, options) => {
if (options.body === JSON.stringify({ key: 'value' })) {
return { status: 'success' };
} else {
return { status: 'error' };
}
});
fetch('https://api.example.com/submit', {
method: 'POST',
body: JSON.stringify({ key: 'value' })
})
.then(response => response.json())
.then(data => console.log(data));
Mocking with delay
This feature allows you to mock a request with a delay. The code sample demonstrates how to mock a GET request to 'https://api.example.com/delayed' and return a response after a 1-second delay.
const fetchMock = require('fetch-mock');
fetchMock.get('https://api.example.com/delayed', new Promise(resolve => setTimeout(() => resolve({ data: 'delayed data' }), 1000)));
fetch('https://api.example.com/delayed')
.then(response => response.json())
.then(data => console.log(data));
Mocking with different response statuses
This feature allows you to mock requests with different HTTP response statuses. The code sample demonstrates how to mock a GET request to 'https://api.example.com/not-found' and return a 404 status.
const fetchMock = require('fetch-mock');
fetchMock.get('https://api.example.com/not-found', 404);
fetch('https://api.example.com/not-found')
.then(response => {
if (!response.ok) {
throw new Error('Network response was not ok');
}
return response.json();
})
.catch(error => console.error('Fetch error:', error));
Nock is a HTTP mocking and expectations library for Node.js. It intercepts HTTP requests and allows you to define custom responses. Compared to fetch-mock, Nock is more focused on Node.js and works with any HTTP library, not just fetch.
Mock Service Worker (MSW) is a library for mocking network requests in both browser and Node.js environments. It uses Service Workers to intercept requests in the browser, making it more versatile for front-end testing compared to fetch-mock.
Axios Mock Adapter is a library specifically designed for mocking requests made with the Axios HTTP client. It provides a simple API for defining request handlers and responses. While fetch-mock is designed for the Fetch API, axios-mock-adapter is tailored for Axios.
Mock http requests made using fetch.
Features include:
New If using jest, try the new fetch-mock-jest wrapper.
New Cheatsheet
fetchMock.mock('http://example.com', 200);
const res = await fetch('http://example.com');
assert(res.ok);
fetchMock.restore();
I devote a lot of time to maintaining fetch-mock for free. I don't ask for payment, but am raising money for a refugee charity - please consider donating
fetch-mock requires the following to run:
fetch
API when testing in a browserSee the project website or cheatsheet
If you're using jest as your test runner, consider using fetch-mock-jest, a lightweight, jest-friendly wrapper around fetch-mock.
fetch-mock is licensed under the MIT license. Copyright © 2019, Rhys Evans
FAQs
Mock http requests made using fetch
The npm package fetch-mock receives a total of 670,924 weekly downloads. As such, fetch-mock popularity was classified as popular.
We found that fetch-mock demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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