JF
JSON Formatter / Validator
Paste JSON — format (beautify), minify or validate it. Syntax errors show the exact spot. It all happens in your browser.
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Input
Result
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How to use — JSON Formatter / Validator
- Paste your JSON in the input box.
- Click Format — it beautifies with 2-space indentation.
- Use Minify to strip all spaces for compact JSON.
- If the JSON is invalid, a message with the exact error position appears.
FAQ
Why does it say my JSON is invalid?
Common mistakes: keys not in double quotes, a trailing comma after the last item, single quotes, or comments — none of these are allowed in JSON. The error message shows the exact position.
Is my JSON data uploaded anywhere?
No — parsing and formatting happen in the browser via JSON.parse/JSON.stringify. JSON containing API keys or sensitive data is safe too.
How large a JSON can this handle?
Several MB with ease — it's processed entirely in the browser. Very large files (50MB+) may be slow.
Is JSON5 or JSONC (with comments) supported?
No — this is a strict JSON validator (RFC 8259). Comments and trailing commas are invalid in standard JSON, so you'll get an error.
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