Format JSON Online
Validate and neatly indent a JSON file.
Free to use. No added watermarks.
- 1Choose files
- 2Make it yours
- 3Preview & save
Drop a file here
Or choose from your device. Your originals stay unchanged.
JSON · 20 MB per document (25 MB for PDF) · 50 MB total · max. 20 files
Processed on your device. No file upload.
How to use Format JSON
- Choose a json file.
- Adjust the available options and process your file.
- Review the result, then copy or download it.
Make the result work for you
Read or compact JSON with two-space, four-space, or no indentation. Invalid syntax produces an error; the original file remains unchanged.
Formats and practical limits
Read a compact JSON document with two-space indentation and a copy-ready preview. Invalid JSON reports a parsing error.
About this tool
What can I do with Format JSON?
Read or compact JSON with two-space, four-space, or no indentation. Invalid syntax produces an error; the original file remains unchanged.
Which inputs and outputs does this tool support?
JSON → JSON. Reformatting does not change the intended data. JavaScript number precision applies; duplicate object keys retain the last value.
Does Format JSON upload my data?
Selected file contents and generator inputs are processed locally in your browser. The website still loads its code and fonts from the host. Download results before closing the page.
How do I keep my result?
Review the preview, choose a download filename, and save the generated file. Text and table outputs also offer copy actions. The source file is unchanged.