How to use the JSON toolkit
- Paste your JSON into the input area.
- Press Format to pretty-print it or Minify to compress it to one line.
- Use Validate to check the syntax and see the root type and byte size.
- Copy or download the processed result when you are done.
- Work on a copy of important data so formatting experiments never overwrite the original.
When it helps
- Pretty-printing a compact API response.
- Checking whether a configuration file contains valid JSON.
- Minifying payloads before pasting them into another system.
- Sorting object keys to make diffs easier to read.
- Preparing a JSON fixture file for automated tests.
Frequently asked questions
Is my JSON sent to a server?
No. The text is parsed and formatted only in your browser and never leaves your device.
What are the limitations?
The toolkit works with standard JSON, so trailing commas, comments, and single quotes are rejected as invalid. Very large documents may slow down formatting.
What does the sort option do?
It reorders object keys alphabetically at every level, which can make version diffs of JSON files cleaner.
Does validation report the problem?
Yes. If the input is invalid, the status area shows the parser error message from the browser.
Can I save the formatted result?
Yes. The download button saves the output as a .json file, and the copy button puts it on the clipboard.
Can it handle nested objects and arrays?
Yes. Formatting, minifying, and sorting work on nested objects and arrays at any depth. The sort action reorders keys at every level without changing values or array order. Validation checks the whole document, including deeply nested parts, and reports the first error it finds.