JSON Formatter and Validator
Paste JSON to pretty-print it with proper indentation, minify it for production, or find out exactly where a syntax error is.
How to use the JSON Formatter and Validator
- Paste your JSON into the input area.
- Click beautify to format it, or minify to strip whitespace.
- If it is invalid, read the error message pointing to the position of the problem.
About the JSON Formatter and Validator
The most useful part of a formatter is the error message. When a payload fails to parse, knowing the character position of the problem is the difference between a five-second fix and ten minutes of squinting. Common causes are trailing commas, single quotes instead of double, and unescaped characters inside strings. Everything is parsed in your browser, so it is safe to paste API responses containing internal data.
Frequently asked questions
Why is my JSON invalid?
Usually a trailing comma, single quotes instead of double quotes, or an unescaped character inside a string. The error message shows the position.
Is my JSON data sent to a server?
No. Parsing and formatting happen entirely in your browser.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks for readability; minify removes all optional whitespace to reduce transfer size.
Will it tell me where my JSON is broken?
Yes. The parser reports the exact position where it failed, which is normally a trailing comma, a single quote or an unescaped character. Fix that point and re-run to validate the rest.
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Runs entirely in your browser — nothing you enter is uploaded. Last reviewed and updated .