How to alphabetically sort the keys of a JavaScript object?

General Discussions
1

For example, given an object like { 'b': 'asdsad', 'c': 'masdas', 'a': 'dsfdsfsdf' }, how can you rearrange it so the keys appear in alphabetical order as { 'a': 'dsfdsfsdf', 'b': 'asdsad', 'c': 'masdas' }?

2

I’ve worked with JavaScript quite a bit, and one thing to keep in mind is that JavaScript objects don’t guarantee key order by default. But if you want to get a new object with keys sorted alphabetically, here’s a simple way to do it:

const obj = { b: 'asdsad', c: 'masdas', a: 'dsfdsfsdf' };
const sortedObj = {};
Object.keys(obj).sort().forEach(key => {
  sortedObj[key] = obj[key];
});
console.log(sortedObj);
// { a: 'dsfdsfsdf', b: 'asdsad', c: 'masdas' }

This way, you create a fresh object with the keys arranged in sorted order, which often helps when you need a predictable key sequence.

3

Adding on to what @vindhya.rddy mentioned, since JavaScript objects themselves don’t maintain order, the common trick is exactly to sort the keys first and then build a new object from that sorted list. I prefer using reduce because it’s a bit cleaner and more functional:

const unsorted = { b: 'asdsad', c: 'masdas', a: 'dsfdsfsdf' };
const sorted = Object.keys(unsorted).sort().reduce((acc, key) => {
  acc[key] = unsorted[key];
  return acc;
}, {});
console.log(sorted);

This approach does the same but feels more declarative and fits well into modern JS workflows, especially if you’re preparing data for display or serialization.

4

Building further on those solid approaches, one thing I like to remind folks is that while we’re reconstructing the object in sorted key order, this only influences iteration order in environments like modern browsers and Node.js, which respect insertion order for objects. So, you can rely on this for most use cases:

let obj = { b: 'asdsad', c: 'masdas', a: 'dsfdsfsdf' };
let ordered = {};
Object.keys(obj).sort().forEach(k => ordered[k] = obj[k]);
console.log(ordered);

Remember, this sorted object helps especially when you want to output or traverse keys predictably. Just keep in mind that for older environments, key order might not be guaranteed.