Hi @rakhishah,
Thanks for reaching out!
You can actually hook into the Bing geocoding API from your CesiumJS app. You just need to get a Bing key from here: https://www.bingmapsportal.com
Then you can pass it in the viewer constructor to use it:
var viewer = new Cesium.Viewer(‘cesiumContainer’, {
geocoder: [ new Cesium.BingMapsGeocoderService({
key: ‘Your Bing Key’
}) ]
});
Best,
Muthu