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Format, validate, and beautify JSON online. Tree view, syntax highlighting, and error detection — all in your browser.
Click Format or Minify to see the result
Our validator will highlight exactly where the error is and what's wrong — missing commas, unclosed brackets, or invalid syntax. You'll need to fix the source, but we make it easy to find the issue with line-level error messages.
Formatting (beautify) adds indentation, line breaks, and spacing to make JSON human-readable. Minifying removes all unnecessary whitespace to create the smallest possible file — ideal for production or API responses.
Yes, all processing happens in your browser. Your data never leaves your device — no uploads, no server processing.
Yes, there's no file size limit since processing is client-side. For very large JSON files (10MB+), performance depends on your device's memory and CPU.