JSON Formatter / Validator
Format, beautify and validate JSON online. Instant syntax error detection with line numbers.
Frequently asked questions
- How does it validate my JSON?
- It parses your input with the browser's built-in JSON parser. If something is wrong, the actual parser error message is shown, which usually points straight at the offending character.
- What is the difference between Format and Minify?
- Format pretty-prints the JSON with two-space indentation for reading, while Minify strips all whitespace and outputs one compact line.
- Is my JSON data uploaded anywhere?
- No. Parsing and formatting happen entirely in your browser, so API responses, config files and logs stay on your machine.
- Can it handle large files?
- Yes, there is no size limit built into the tool. Performance depends on your device, but files with tens of thousands of lines generally format instantly.
This tool runs entirely in your browser. No data is uploaded anywhere.