JSFiddle - React, Tailwind, and code Playground

JavaScript

var a = "{gallery: 'gal', smallimage: '/uploads/photo/image/3256/big_1303-1.jpg', largeimage: '/uploads/photo/image/3256/zoom_1303-1.jpg'}";

var b = a.split(',');

var c = b[2].split("'");

var img = c[1]

console.log(img);