fetch-jsonp-polyfill

Native fetch api does not support jsonp, which is often very confusing. If you are persistent to use jsonp in fetch, you may wish to use this polyfill

Installation

You can install with npm.

npm install fetch-jsonp-polyfill --save-dev

Notice

It is compatible with almost all mainstream jsonp polyfills libraries. E.g https://github.com/github/fetch https://github.com/matthew-andrews/isomorphic-fetch https://github.com/bitinn/node-fetch

But it is important to note that you must import 'fetch-jsonp-polyfill' after them.

require('isomorphic-fetch')
require('fetch-jsonp-polyfill')

or 
import 'whatwg-fetch'
import 'fetch-jsonp-polyfill'

Usage

You don't need to make any changes, just modify the method:'GET' to method:'JSONP'.
So simple, in fact I have almost no modifications.

fetch('http://jsfiddle.net/echo/jsonp/?hello=world', {
    method: "JSONP"
})
.then(res => res.json())
.then(data => {
    console.log(data);
})
.catch(err => {
    console.log(err);
})

Other Options

fetch(URL, {
    method: 'JSONP',
    timeout: 5000,
    callback: 'callback',
    callbackName: 'fetchjsonp_callback',
})

Browser Support

Latest ✔	Latest ✔	9+ ✔	Latest ✔	6.1+ ✔

License

MIT