JSFiddle - React, Tailwind, and code Playground

JavaScript

var test = {
    level1: {
        level2: {
            level3: false
        }
    }
};

if (test.level1 && test.level1.level2 && test.level1.level2.level3) {
    alert(test.level1.level2.level3);
} else {
    alert('!!!');
}