A fake XMLHttpRequest

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A library for mock HTTP requests
This is forked from the excellent FakeXMLHttpRequest project. The difference is that this version normalized request headers (to better support this fetch polyfill).
The original readme follows:
FakeXMLHttpRequest Build Status
This library provide a fake XMLHttpRequest object for testing browser-based libraries. It is partially extracted (and in many places simplified) from Sinon.JS and attempts to match the behavior of XMLHttpRequest specification.

Why not just use Sinon.JS?

Sinon includes much more than just a fake XHR object which is useful in situations where you may not need mocks, spies, stubs, or fake servers.

How to use it

In addition to matching the native XMLHttpRequest's API, FakeXMLHttpRequest adds a respond function that takes three arguments: a HTTP response status number, a headers object, and a text response body:
// simulate successful response
import FakeXMLHttpRequest from "fake-xml-http-request";

xhr = new FakeXMLHttpRequest();
xhr.respond(200, {"Content-Type": "application/json"}, '{"key":"value"}');
xhr.status; // 200
xhr.statusText; // "OK"
xhr.responseText; // '{"key":"value"}'

// simulate failed response
xhr = new FakeXMLHttpRequest();

There is no mechanism for swapping the native XMLHttpRequest or for recording, finding, or playing back requests. Libraries using FakeXMLHttpRequest should provide this behavior.


Tests are written in QUnit and run through the Karma test runner.
Run with:
karma start

Code of Conduct

In order to have a more open and welcoming community this project adheres to a code of conduct adapted from the contributor covenant.
Please adhere to this code of conduct in any interactions you have with this project's community. If you encounter someone violating these terms, please let a maintainer (@trek) know and we will address it as soon as possible.