JSON File Formatter
JSON File Formatter is a free developer tool that runs directly in your browser with no account required.
About this tool
Format entire JSON files by uploading them or pasting their contents, then choose pretty print or minify. Alongside the reformatted output you get structure statistics, a path-by-path table, precise parse-error locations, and downloads for both the formatted file and a JSON inspection report.
How to use
- Click Upload file to load a .json file, or paste content into the Input area.
- Select Pretty print or Minify in the Mode dropdown.
- Review the structure metrics and the path table with types and previews.
- Download formatted.json or the json-inspection-report.json as needed.
Frequently asked questions
What file types can I upload?
The picker accepts .json and plain-text files. Whatever you upload is read into the input area as text, so you can also edit it before formatting.
How is this different from the JSON Formatter tool?
It is built for files: an upload control loads the document for you, and the same inspector then reports depth, type counts, paths, and size. The paste-based JSON Formatter is quicker for small snippets.
How large a file can it handle?
There is no fixed limit; files are processed in browser memory. Multi-megabyte files generally work, but the path table shows only the first 80 paths regardless of size.
What if my file has a syntax error?
The tool shows the parser message and, when available, the exact line, column, and character position of the failure so you can fix it in place and re-run.
Does uploading send my file to a server?
No. The file is read locally with the browser's File API and never leaves your machine, which makes the tool safe for configs containing secrets.