Fetch JSONP

JSONP is NOT supported in standard Fetch API, https://fetch.spec.whatwg.org. fetch-jsonp provides you same API to fetch JSONP like naive Fetch, also comes with global fetchJsonp function.

If you need a fetch polyfill for old browsers, try github/fetch.

Installation

You can install with npm.

npm install fetch-jsonp

Promise Polyfill for IE

IE8/9/10/11 does not support ES6 Promise, run this to polyfill the global environment at the beginning of your application.

require('es6-promise').polyfill();

Usage

The fetch-jsonp function supports any HTTP method. We'll focus on GET and POST example requests.

Fetch JSONP in simple way

fetchJsonp('/users.jsonp')
  .then(function(response) {
    return response.json()
  }).then(function(json) {
    console.log('parsed json', json)
  }).catch(function(ex) {
    console.log('parsing failed', ex)
  })

Set JSONP callback name, default is 'callback'

fetchJsonp('/users.jsonp', {
    jsonpCallback: 'custom_callback'
  })
  .then(function(response) {
    return response.json()
  }).then(function(json) {
    console.log('parsed json', json)
  }).catch(function(ex) {
    console.log('parsing failed', ex)
  })

Set JSONP request timeout, default is 5000ms

fetchJsonp('/users.jsonp', {
    timeout: 3000,
    jsonpCallback: 'custom_callback'
  })
  .then(function(response) {
    return response.json()
  }).then(function(json) {
    console.log('parsed json', json)
  }).catch(function(ex) {
    console.log('parsing failed', ex)
  })

Caveats

You need to call .then(function(response) { return response.json(); }) in order to keep consistent with Fetch API.

Browser Support

Latest ✔	Latest ✔	8+ ✔	Latest ✔	6.1+ ✔

License

MIT

Acknowledgement

Thanks to github/fetch for bring Fetch to old browsers.