node.js - Sort JSON objects by a value [duplicate]

Question

I have this JSON file on my server:

{"1504929411112":{"name":"user1","score":"10"},"1504929416574":{"name":"2nduser","score":"14"},"1504929754610":{"name":"usr3","score":"99"},"1504929762722":{"name":"userfour","score":"40"},"1504929772310":{"name":"user5","score":"7"}}

Assuming I have parsed this file:

var json = JSON.parse(getJSONFile());

How can I now sort each object in the json variable by the score property? None of the array sorting functions work for me as json is not an array.

Answer 1

Since these are objects' properties, their order is usually unknown and not guaranteed. To sort them by some internal property, you would first have to change the Object into an Array, for example:

const json = JSON.parse(getJsonFile());

const jsonAsArray = Object.keys(json).map(function (key) {
  return json[key];
})
.sort(function (itemA, itemB) {
  return itemA.score < itemB.score;
});

For more, see:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map

Answer 2

var ob = { "fff": { "name": "user1", "score": "10" }, "bbbb": { "name": "user4", "score": "14" }, "dddd": { "name": "user2", "score": "99" }, "cccc": { "name": "user5", "score": "40" }, "aaaa": { "name": "user3", "score": "7" } };


Object.keys(ob).map(key => ({ key: key, value: ob[key] })).sort((first, second) => (first.value.name < second.value.name) ? -1 : (first.value.name > second.value.name) ? 1 : 0 ).forEach((sortedData) => console.log(JSON.stringify(sortedData)));