It's a JsonDataService

json-data-service.js

angular.module('someApp')
    .service('JsonDataService', function () {
        return {
            init: function () {
                var thisService = this;
                var xobj = new XMLHttpRequest();
                xobj.overrideMimeType("application/json");
                xobj.open('GET', './app/data/cm-ux-guide-data.json', true);
                xobj.onreadystatechange = function () {
                    if (xobj.readyState == 4 && xobj.status == "200") {
                        thisService.uxGuideData = JSON.parse(xobj.responseText)[0];
                    }
                };
                xobj.send(null);
            },
            uxGuideData: {},
            getUxGuideData: function () {
                return this.uxGuideData;
            },
            getNavigation: function () {
                return this.uxGuideData["Navigation"];
            },
            getComponents: function () {
                return this.uxGuideData["Components"];
            },
            getGuides: function () {
                return this.uxGuideData["Guides"];
            },
            getNavigationByID: function (_NavigationID) {
                return this.uxGuideData["Navigation"].Where(x => x.NavigationID == _NavigationID).toArray();
            },
            getComponentByID: function (_ComponentID) {
                return this.uxGuideData["Components"].Where(x => x.ComponentID == _ComponentID).toArray();
            },
            getScriptByID: function (_ScriptID) {
                return this.uxGuideData["Scripts"].Where(x => x.ScriptID == _ScriptID).toArray();
            }
        };
    });