Sort JSON Object Keys Online
Sort object keys throughout a JSON document while preserving arrays and values. Use stable key ordering to make configuration files easier to scan, reduce noisy diffs, and normalize fixtures or snapshots before review.
🔒 Your data stays in your browser. FixTools does not upload this JSON for processing.
How to use JSON Sorter
- Step 1
Paste valid JSON into the editor and choose Ascending or Descending key order.
- Step 2
Click Sort JSON. FixTools recursively visits every object and reorders its property names while leaving values and array positions unchanged.
- Step 3
Copy the normalized result for a config file, fixture, snapshot, comparison, or code review.
JSON key sorting example
Sorting object keys makes two differently formatted configuration objects easier to compare because equivalent properties appear in a predictable order.
Example input
{"z":1,"user":{"role":"dev","name":"Ada"},"a":2}Example output
{"a":2,"user":{"name":"Ada","role":"dev"},"z":1}What this tool does
The sorter recursively orders object keys at every nesting level. Arrays keep their existing item order because array order is data, while object property order is usually presentation and should not change the meaning of valid JSON.
Common use cases
- • Normalize configuration files before code review
- • Reduce property-order noise in version-control diffs
- • Create stable JSON fixtures or snapshots
- • Prepare JSON before structural comparison
- • Make large objects easier to scan alphabetically
How it works
JavaScript parses the document into objects and arrays, then the tool rebuilds each object by sorting Object.keys with localeCompare. Nested objects are processed recursively. Array elements are recursively processed but are never reordered.
Limitations and edge cases
JSON consumers should not rely on object property order for meaning. This tool changes presentation order only. Arrays are intentionally not sorted because changing array order can alter the data. If you need to sort array items by a field such as id or name, that requires a separate, explicit data transformation.
Related concepts
Object order vs. array order
Object property order is generally not semantic in JSON, while array order is explicitly part of the data model.
Canonical JSON
A simple alphabetical sort is useful for readability and diffs, but formal canonicalization standards may impose additional rules for numbers, escaping, and serialization.
JSON Sorter FAQ
Does sorting JSON keys change the data?
Sorting object keys should not change the logical data for standards-compliant consumers. Values and array order remain unchanged.
Does this tool sort nested JSON objects?
Yes. Object keys are sorted recursively at every nesting level.
Does the JSON sorter sort arrays?
No. Array item order is preserved because array position can carry meaning.
Why sort JSON before comparing files?
Stable key ordering reduces formatting noise, making meaningful value changes easier to spot in text diffs or reviews.