JSON Formatter Online - Beautify & Validate
Format, beautify, validate, and minify JSON online instantly. Free JSON pretty printer with syntax validation. 100% client-side — your data is never sent to any server.
Frequently Asked Questions about JSON Formatter
How do I format JSON online?
Simply paste your JSON into the input box. The formatter will instantly beautify and validate it. Use the toolbar to switch between Beautify and Minify modes, or adjust indentation to 2 spaces, 4 spaces, or tabs.
What is JSON pretty print?
JSON pretty print (also called JSON beautify or JSON format) is the process of converting compact, minified JSON into a human-readable format with proper indentation and line breaks. This tool does it instantly in your browser.
Can I validate JSON syntax for free?
Yes, this tool validates your JSON syntax in real-time as you type. It highlights errors and shows a status indicator so you can immediately see whether your JSON is valid or not.
Is my JSON data secure?
Yes, this tool is 100% client-side. Your JSON data is processed entirely within your browser and is never sent to any server. Your sensitive data remains completely private.
Can it handle large JSON files?
Yes, our formatter is optimized to handle large JSON strings efficiently within your browser's memory limits without crashing.
How do I minify JSON?
Click the 'Minify' tab to switch to minification mode. The tool will remove all whitespace and line breaks to produce the most compact JSON representation — useful for reducing payload sizes in APIs.
How do I format JSON with 4 spaces instead of 2?
Use the smart toolbar located just above the input area to switch the indentation level between 2 spaces, 4 spaces, or tabs.