JSFiddle - React, Tailwind, and code Playground

JavaScript

jsonObj = [];
var item = {};
item["collection"]="node1";
item["reprocess"]="yes";
item["days"]="10";

jsonObj.push(item);

jsonString = JSON.stringify(jsonObj);

alert(jsonString);

// non native name
jsonObj = [];
items = {};
items["collection"]="node1";
items["reprocess"]="yes";
items["days"]="10";

jsonObj.push(items);

jsonString = JSON.stringify(jsonObj);

alert(jsonString);