Does this JSON formatter upload my data?
No. JSON parsing and formatting happen locally in your browser, and your input is not uploaded.
Your JSON stays in your browser. Nothing is uploaded.
JSON Formatter / Validator
Paste JSON to validate it, format it with 2 spaces, 4 spaces, or tabs, or minify it for compact use without sending data anywhere.
Your JSON stays in your browser. Nothing is uploaded.
Format and validate JSON
Private JSON formatting for quick checks
Use this JSON formatter for API responses, configuration snippets, test payloads, copied logs, and small data samples that need to be easier to read or safely minified.
The tool uses the browser's built-in JSON parser and formatter. Invalid JSON shows a clear parser message so you can fix the input before copying the result.
How to use this tool
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Paste JSON
Add the JSON object, array, API response, or configuration snippet you want to check.
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Format or minify
Choose an indentation size and format for readability, or minify the JSON into a compact single line.
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Copy valid output
Review the validation message, then copy the formatted or minified result when the JSON is valid.
FAQ
What happens if the JSON is invalid?
The tool shows the browser parser message so you can find and fix syntax issues such as missing commas, quotes, or brackets.
Can I minify JSON?
Yes. Use the Minify button to remove extra whitespace and produce compact JSON.
Which indentation options are supported?
You can format JSON with 2 spaces, 4 spaces, or tabs.