Make JSON readable, validate it before use, or compress it without uploading API data or configuration.
JSON Formatter and Validator
Formatting uses two or four spaces and preserves parsed JSON values. Invalid JSON reports the browser parser’s location detail.
How to use this tool
- Paste JSON, load a local JSON file, or use the example.
- Choose indentation and optional key sorting, then format, minify or validate locally.
- Review the line-aware result, copy it, download it, or switch to the collapsible tree.
Frequently asked questions
Does formatting change JSON values?
Formatting and minifying preserve parsed JSON values. Sorting object keys is a separate optional action; array order remains unchanged.
Why does a large input wait for an action?
Inputs above the typing threshold only run when you choose an action, which keeps the browser responsive.