JSFiddle - React, Tailwind, and code Playground
HTML
<input type="submit" onclick=testJSON() value="Test"/>
<div id = "result">Test </div>JavaScript
function testJSON() {
var jsonString = '{"param1":"123","param2":"XXX78","param3":"11378"}';
document.getElementById("result").innerHTML = (JSON.parse(jsonString)).param2;
}