Developer tool
JSON Formatter
Pretty-print, validate, minify, and tree-view JSON data. Free, runs in browser.
Frequently asked questions
How do I validate JSON?
Paste your JSON in the textarea and click the "Validate" tab. The tool will check if the JSON is syntactically valid and display any errors with line and column numbers if invalid.
What is the difference between pretty print and minify?
Pretty print adds indentation and line breaks to make JSON human-readable. Minify removes all whitespace and comments to reduce file size. Both preserve the original data structure.
Is this tool secure?
Yes — all processing happens entirely in your browser. Your JSON data never leaves your device, and we do not store or transmit any of your content.