How to use
- Paste JSON into the input box.
- Click "Format" to beautify, "Minify" to strip whitespace, or "Validate" to check syntax.
- Errors show the reason plus line and column in the status bar.
FAQ
Does it support JSON5 or comments?
No — standard JSON only. Strip comments from config files first.
How large can files be?
Several MB is fine; extremely large text may lag the browser.
Why an error at character 0?
Usually empty input or an invalid first character — check the paste was complete.
About this JSON Formatter
Built for everyday debugging: formatting follows the standard JSON.parse + stringify path, so output matches browser behavior exactly. Error messages are parsed for position offsets and converted to line/column so a stray comma or missing quote is easy to spot. All data stays local — API responses never leave your machine.