JSFiddle - React, Tailwind, and code Playground

HTML

<div id="result">

</div>

JavaScript

const json = [
  {
    "nm":"BRANCHID", 
    "vl":"1"
  },
  {
    "nm":"TELLERID",
    "vl":"9903" 
  },
  {	
    "nm":"mobile",
    "vl":"9903234565" 
  }
];

let result = document.getElementById('result');

let newObj = {};
json.forEach(sort);

function sort(item, index){
  newObj[ json[index].nm ] = json[index].vl;
}

result.innerHTML += JSON.stringify(newObj);