cross-fetch
Advanced tools
Universal WHATWG Fetch API for Node, Browsers and React Native
The cross-fetch npm package is a polyfill for the Fetch API that works in both browser and Node.js environments. It allows you to make HTTP requests using the same API across different platforms, providing a consistent way to fetch resources asynchronously over the network.
Performing HTTP GET requests
This code sample demonstrates how to perform a simple HTTP GET request to retrieve data from a specified URL and then process the JSON response.
fetch('https://api.example.com/data')
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));Performing HTTP POST requests
This code sample shows how to perform an HTTP POST request to send JSON data to a server and then handle the JSON response.
fetch('https://api.example.com/data', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({ key: 'value' })
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));Handling HTTP errors
This code sample illustrates how to handle errors in HTTP requests by checking the response status and throwing an error if the response is not successful.
fetch('https://api.example.com/data')
.then(response => {
if (!response.ok) {
throw new Error('Network response was not ok');
}
return response.json();
})
.then(data => console.log(data))
.catch(error => console.error('Error:', error));Axios is a popular HTTP client for the browser and Node.js. It provides a promise-based API and has a similar feature set to cross-fetch, including the ability to make GET, POST, and other types of HTTP requests. Axios also includes interceptors for request and response transformation, which cross-fetch does not have.
node-fetch is a lightweight module that brings the Fetch API to Node.js. It is similar to cross-fetch but is specifically designed for Node.js environments and does not work in the browser. node-fetch is a good choice if you only need to support server-side fetching.
isomorphic-fetch is another Fetch API polyfill that works in both Node.js and browser environments. It is similar to cross-fetch in its goal to provide a consistent API across platforms. However, isomorphic-fetch has not been updated as frequently as cross-fetch, which may be a consideration for developers looking for a well-maintained package.
whatwg-fetch is a polyfill for the Fetch API for browsers. It is maintained by the GitHub team and is intended to be used in browser environments only. Unlike cross-fetch, it does not provide Node.js support, making it less versatile for isomorphic applications.
Universal WHATWG Fetch API for Node, Browsers, Workers and React Native. The scenario that cross-fetch really shines is when the same JavaScript codebase needs to run on different platforms.
npm install --save cross-fetch
As a ponyfill (imports locally):
// Using ES6 modules with Babel or TypeScript
import fetch from 'cross-fetch';
// Using CommonJS modules
const fetch = require('cross-fetch');
As a polyfill (installs globally):
// Using ES6 modules
import 'cross-fetch/polyfill';
// Using CommonJS modules
require('cross-fetch/polyfill');
The CDN build is also available on unpkg:
<script src="//unpkg.com/cross-fetch/dist/cross-fetch.js"></script>
This adds the fetch function to the window object. Note that this is not UMD compatible.
With promises:
import fetch from 'cross-fetch';
// Or just: import 'cross-fetch/polyfill';
fetch('//api.github.com/users/lquixada')
.then(res => {
if (res.status >= 400) {
throw new Error("Bad response from server");
}
return res.json();
})
.then(user => {
console.log(user);
})
.catch(err => {
console.error(err);
});
With async/await:
import fetch from 'cross-fetch';
// Or just: import 'cross-fetch/polyfill';
(async () => {
try {
const res = await fetch('//api.github.com/users/lquixada');
if (res.status >= 400) {
throw new Error("Bad response from server");
}
const user = await res.json();
console.log(user);
} catch (err) {
console.error(err);
}
})();
You can find a comprehensive doc at Github's fetch page. If you want to play with cross-fetch, check our JSFiddle playground.
Tip: Run the fiddle on various browsers and with different settings (for instance: cross-domain requests, wrong urls or text requests). Don't forget to open the console in the test suite page and play around.
I did a lot of research in order to find a fetch library that could be simple, cross-platform and provide polyfill as an option. There's a plethora of libs out there but none could match those requirements.
In a word? Risk. If the spec changes in the future, it might be problematic to debug. Read more about it on sindresorhus's ponyfill page. It's up to you if you're fine with it or not.
Just like isomorphic-fetch, it is just a proxy. If you're in node, it delivers you the node-fetch library, if you're in a browser or React Native, it delivers you the github's whatwg-fetch. The same strategy applies whether you're using polyfill or ponyfill.
 |  |  |  |  |  |
|---|---|---|---|---|---|
| The New York Times | Apollo GraphQL | Swagger | VulcanJS | graphql-request |
Heavily inspired by the works of matthew-andrews. Kudos to him!
cross-fetch is licensed under the MIT license © Leonardo Quixadá
 |
|---|
| @lquixada |
FAQs
Universal WHATWG Fetch API for Node, Browsers and React Native
The npm package cross-fetch receives a total of 15,071,036 weekly downloads. As such, cross-fetch popularity was classified as popular.
We found that cross-fetch 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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