JSON Formatter & Validator
Prettify, minify or validate JSON instantly. All processing runs in your browser.
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Output will appear here…
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Frequently Asked Questions
JSON (JavaScript Object Notation) is a lightweight text format for storing and transporting data. It is human-readable and language-independent, making it the most common format for APIs and configuration files.
Formatting (pretty-printing) adds indentation and line breaks to make JSON readable. Minifying removes all unnecessary whitespace to reduce file size — useful for production APIs where bandwidth matters.
No. This tool runs entirely in your browser using JavaScript. Your JSON data never leaves your device.
Common issues: trailing commas, single quotes instead of double quotes, unquoted keys, missing commas between items, or mismatched brackets/braces. The error message shows the exact position of the problem.