JSFiddle - React, Tailwind, and code Playground
JavaScript
var result = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAAAAABX3VL4AAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3gYSDCUgSze0AAAAAA5JREFUCNdjrGJgYmAAAAJ0AH4SDHVIAAAAAElFTkSuQmCC";
alert(result.split(',')[1]);
alert(result.substr(result.indexOf(',') + 1));