Online JSON Formatter & Beautifier
Format, validate, and minify your JSON data instantly.
How to Use the JSON Formatter
Our free online JSON formatter takes raw, unformatted JSON data and transforms it into a clean, readable structure with proper indentation. This tool is essential for developers, QA engineers, and anyone working with APIs or configuration files.
- Paste your JSON into the input area on the left. This can be a minified API response, a configuration object, or any valid JSON string.
- Click "Format / Beautify" to apply standard 4-space indentation and proper line breaks. The formatted output appears on the right.
- Click "Minify" to compress your JSON by removing all whitespace — useful for reducing payload size in production.
- Click "Copy to Clipboard" to instantly copy the output for use in your editor, terminal, or API client.
All processing happens entirely in your browser. Your JSON data is never sent to our servers, making this tool completely safe for sensitive data including API keys, configuration secrets, and personal information.
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write and easy for machines to parse and generate. JSON is used extensively in web APIs, configuration files, and data storage.
Why does my JSON show "Invalid JSON" error?
Common causes include: trailing commas after the last item in an array or object, single quotes instead of double quotes, unquoted property names, or missing brackets. JSON requires strict syntax — use our formatter to quickly identify where the error occurs.
Is there a size limit?
Since all processing happens in your browser, the limit depends on your device's available memory. In practice, this tool handles JSON files up to several megabytes without issues.