JSON Formatter
Pretty-print, minify, validate and sort JSON, with exact error positions.
Runs on your device. Files are never uploaded.How to use JSON Formatter
- Paste your JSON
- Choose format or minify
- Copy or save the result
About this tool
Paste JSON and get readable, indented output instantly, or minify it for transport. Errors show the line and column so you can fix them fast.
Like every tool on YantraStack, it is free with no accounts, limits or watermarks, and it works offline once the page has loaded. See how to verify that nothing is uploaded.
Questions
Is my JSON uploaded?
No. Parsing happens in your browser tab, so API responses and config files stay private.
Guides
How local-first browser tools work: PDFs, images and workers
A developer’s look at how tools like YantraStack process PDFs and images entirely client-side, using standard browser APIs, Web Workers and canvas.
How to compare two texts and see what changed
Paste an original and an edited version, and see added and removed lines marked with plus and minus signs. Good for contracts, config files and drafts.
How to format, validate and minify JSON online (with error positions)
Pretty-print messy JSON, find syntax errors by line and column, sort keys, minify, and escape or unescape strings, all locally.