Sort an object by its properties

Rebuild an object with its keys in sorted order.

JavaScript Version 1.0.0 · MIT · .md

function sortKeys(object) { return Object.fromEntries(Object.keys(object).sort().map(key => [key, object[key]])); }

Input & expected output

{
  "to": "ana@example.com",
  "from": "orders@your-verified-domain.example",
  "subject": "Order 8812"
}

{
  "from": "orders@your-verified-domain.example",
  "subject": "Order 8812",
  "to": "ana@example.com"
}

The edge case

{
  "1": "one",
  "2": "two",
  "b": 1,
  "a": 0
}

{
  "1": "one",
  "2": "two",
  "a": 0,
  "b": 1
}

Know the limits

• Integer-like keys always come first in ascending numeric order, whatever you sort, as the edge case shows. Useful for stable JSON before hashing — but sign raw bytes, as webhooks do.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Pick properties from an object — Build a new object with only the requested own properties.
• Omit properties from an object — Keep the own enumerable fields that are not in a supplied list.
• Create an object from pairs of key and value — Turn [key, value] pairs into a plain object with Object.fromEntries.