Backbone.ajax with window.fetch

var defaults = function(obj, source) { for (var prop in source) { if (obj[prop] === undefined) obj[prop] = source[prop]; } return obj; }

var stringifyGETParams = function(url, data) { var query = ''; for (var key in data) { if (data[key] == null) continue; query += '&' + encodeURIComponent(key) + '=' + encodeURIComponent(data[key]); } if (query) url += (~url.indexOf('?') ? '&' : '?') + query.substring(1); return url; }

var status = function(response) { if (response.status >= 200 && response.status < 300) { return response; } throw new Error(response.statusText); }

var json = function(response) { return response.json() }

Backbone.ajax = function(options) { if (options.type === 'GET' && typeof options.data === 'object') { options.url = stringifyGETParams(options.url, options.data); }

return fetch(options.url, defaults(options, { method: options.type, headers: defaults(options.headers || {}, { 'Accept': 'application/json', 'Content-Type': 'application/json' }), body: options.data })) .then(status) .then(json) .then(options.success) .catch(options.error); };