var ImageKit = require("imagekit");
var imagekit = new ImageKit({
publicKey : "your_public_api_key",
privateKey : "your_private_api_key",
urlEndpoint : "https://ik.imagekit.io/your_imagekit_id/"
imagekit.getFileMetadata("fileId", function(error, result) {
if(error) console.log(error);
else console.log(result);