JSON Formatter & Validator
Format, validate, and minify JSON. Paste or type JSON — see formatted output instantly with syntax validation.
Formatted output will appear here…Frequently Asked Questions
How do I format JSON online?
Paste your JSON into the input field and it automatically validates and formats it in real time. You can choose between 2-space, 4-space, or tab indentation. Click Format to apply the formatting to the input field.
Does this tool upload my JSON data?
No. All formatting, validation, and minification happens entirely in your browser using JavaScript. No data is ever sent to a server. This makes it safe for API responses, config files, and sensitive data.
What does the JSON minifier do?
The minifier removes all unnecessary whitespace, newlines, and indentation from your JSON, producing the smallest possible valid JSON string. Useful for reducing payload size in APIs and storage.
Can it detect JSON syntax errors?
Yes. The tool validates JSON as you type and shows detailed error messages including the approximate line number where the syntax error occurs.