This is a free, real-time JSON formatter and validator that runs 100% in your browser. No data is sent to any server. It supports formatting (beautifying), minifying, sorting keys alphabetically, and real-time validation with line-accurate error messages.
JSON.parse() converts your text into an in-memory JavaScript object, then JSON.stringify() renders it back with proper indentation. This also validates the JSON as a side effect " any syntax errors are caught and displayed with the exact character position.
All processing is done entirely in your browser's memory using JavaScript. No data is sent to any server. When you close this tab, the data is gone. This makes it safe to use with API keys, tokens, or private configuration files.
It recursively sorts all object keys alphabetically throughout the entire JSON structure. Useful for comparing two JSON objects for differences or enforcing consistent key ordering in config files.
Minifying removes all whitespace, newlines, and indentation from valid JSON. The result is functionally identical but smaller " useful for reducing payload size in HTTP API responses or configuration files.
Recursively sort all keys in a JSON object alphabetically. Essential for consistent formatting, version control, and comparison workflows.
Key sorting recursively alphabetizes all object keys throughout a JSON structure. This means top-level keys, nested object keys, keys inside arrays of objects — everything gets sorted.
Why this matters: JSON objects are unordered by specification, meaning {"z":1,"a":2} and {"a":2,"z":1} are semantically identical. But in version control (Git), text-based diffs see them as completely different. Consistent key ordering eliminates noisy diffs caused by key reordering.
The sort is applied recursively — if you have an object inside an object inside an array, all keys at every level are sorted. Array element order is preserved since arrays are ordered by definition.
Why sorted keys matter:
No. The JSON specification defines objects as unordered collections of key-value pairs. Sorting keys only changes the textual representation, not the semantic meaning. JSON.parse() produces identical results from sorted and unsorted versions.
Yes. The sort is recursive — keys at every nesting level throughout the entire JSON structure are alphabetized. Only array element order is preserved.
When JSON keys are unsorted, tools that rewrite JSON files might change key order randomly. Each random reorder creates a noisy Git diff even though no data changed. Sorted keys eliminate this noise, making diffs show only actual value changes.