find number of key value pairs in object javascript code example

Example 1: js get number of keys in object

Object.keys(obj).length

Example 2: how to find the key of an value in an object

function getKeyByValue(object, value) {
  return Object.keys(object).find(key => object[key] === value);
}


const map = {"first" : "1", "second" : "2"};
console.log(getKeyByValue(map,"2"));