Syntax and position
Errors are shown with line, column and nearby source context so they can be corrected without losing the input.
DATA FORMATS · BROWSER-LOCAL
JSON Formatter
Format readable JSON, minify it for compact use and locate syntax errors by line and column – entirely in your browser.
0 bytes
Limit: 2 MiB and 128 nesting levels. JSON5 and comments are not supported.
Formatted result0 bytes
The formatted result will appear here.
Ready for local processing.
TECHNICALLY TRACEABLE
What the formatter checks
Formatting begins with strict syntax validation. Invalid input is never presented as a successful result.
Format and minify
Choose readable indentation or remove insignificant whitespace for compact transfer and storage.
Known limitation
Very large integers outside JavaScript’s safe integer range may lose precision. Use strings when every digit must remain exact.