JSON Key Sorter
Sort JSON object keys alphabetically, reverse alphabetically, or by key length. Recursively sorts nested objects and produces clean, formatted output.
Sort order
Indent
How to Use JSON Key Sorter
- 1Paste your JSON into the input field.
- 2Choose a sort order: A–Z, Z–A, or by key length.
- 3Enable recursive sorting to sort nested objects too.
- 4Copy the sorted and formatted JSON output.
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Frequently Asked Questions
Why sort JSON keys?▾
Sorting JSON keys makes objects easier to read, compare, and diff. When keys are always in alphabetical order, it is easier to find specific fields, especially in large configurations. Sorted keys also reduce noise in git diffs — if two developers independently add keys to the same JSON object, sorted output produces a clean diff where each new key appears in its sorted position rather than wherever it was added. Many code style guides and JSON schemas require sorted keys.
Does key order matter in JSON?▾
Technically, JSON objects are unordered collections of key-value pairs per the RFC 7159 specification. However, most JSON parsers in practice do preserve insertion order. JavaScript engines (V8, SpiderMonkey) preserve insertion order for string keys. Python's dict (3.7+), Java's LinkedHashMap, and most modern parsers maintain order. So while undefined by spec, key order is practically meaningful and widely relied upon.
What is recursive key sorting?▾
Recursive sorting sorts the keys of all nested objects, not just the top level. For example, if your JSON has an "address" object inside a "user" object, recursive sorting will sort the keys of "address" (city, country, street → alphabetically), and also sort the keys of "user" (address, email, name → alphabetically). Without recursive sorting, only the outermost object's keys are reordered.
How do I sort JSON keys in code?▾
In Python: json.dumps(data, sort_keys=True). In JavaScript: JSON.stringify(sortKeys(obj)) where sortKeys recursively sorts using Object.keys(o).sort(). In Java: Use a TreeMap which automatically sorts by key. In Go: json.Marshal produces sorted keys by default because struct fields are sorted, but for dynamic maps you need a custom encoder. Most JSON formatting tools and pretty-printers have a sort option.
What is the difference between stable and unstable sorting?▾
For JSON keys, all sorting is stable in the sense that keys with equal sort order maintain relative position (since keys in a JSON object must be unique, ties cannot occur). Sort stability matters for array elements with equal values. Standard alphabetical (lexicographic) sort compares character by character using Unicode code points. This means uppercase letters (A=65) sort before lowercase (a=97), and "Z" sorts before "a".