JSON Formatter & Validator
Format, validate, and minify JSON with instant error highlighting.
JSON input
Couldn't parse this JSON: Unexpected end of JSON input
Formatted output
Enter some JSON to format or validate.
Frequently asked questions
- Is my JSON uploaded anywhere?
- No. All formatting and validation happens locally in your browser — your data is never sent to a server.
- What's the difference between format and minify?
- Format adds indentation and line breaks to make JSON easy to read. Minify removes all unnecessary whitespace to make the file as small as possible.
- What happens if my JSON is invalid?
- The tool highlights the parsing error, including the position where it occurred, so you can quickly find and fix the problem.
- Is there a size limit?
- There's no hard limit — the tool can handle large JSON files, though very large files (tens of megabytes) may be slower to process since everything runs in your browser.