JSON Formatter & Validator

Format, validate, and beautify JSON data instantly. Catch syntax errors with line numbers.

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Frequently Asked Questions

Yes, it's completely free with no limits. All processing happens in your browser — no data is sent to any server.

Yes. If your JSON has syntax errors, the tool will show the exact error message and position so you can fix it quickly.

There's no hard limit since it runs in your browser, but very large files (50MB+) may be slow depending on your device.

Paste an error or stack trace and get a plain-English explanation, the likely cause, and how to fix it.

Paste a regular expression and get a plain-English explanation, a token-by-token breakdown, and example matches.

Encode text to Base64 or decode Base64 strings back to plain text. Supports UTF-8.

Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.

Bugsly catches errors before your users do — with AI-powered explanations and instant fixes.