Free · no signup · browser-local
JSON Formatter
Indent JSON while preserving original numeric text.
Private by design: files and input stay in this browser. No account or upload.
Formats JSON or standard SQL locally. JSON must be valid; numeric text and duplicate keys are preserved. SQL formatting is not database validation. Nothing is executed.
Getting started
Paste valid JSON, format and copy or download.
Before you use the result
Nothing is executed; review duplicate keys yourself.
Frequently asked questions
Indent JSON while preserving original numeric text.
How do I use JSON Formatter?
Paste valid JSON, format and copy or download.
Does this tool upload my data?
Inputs and files are processed in your browser. Page-view analytics do not contain your tool input.
What should I check before using the result?
Nothing is executed; review duplicate keys yourself.