JSON Formatter
Free online JSON formatter, validator, and viewer. Format, minify, validate JSON with syntax highlighting and tree view. Perfect for debugging APIs. No signup, local browser processing.
How to Use JSON Formatter
- 1Paste your JSON data into the input area
- 2The tool automatically formats and validates the JSON
- 3View the formatted output with syntax highlighting
- 4Toggle between formatted and minified views
- 5Use tree view to navigate nested structures
Frequently Asked Questions
Does it validate JSON syntax and show where errors are?
Yes, invalid JSON is automatically detected and highlighted with line numbers and detailed error messages, so you can see exactly what went wrong and fix it quickly. The validator points to the exact position of the error.
Can I minify JSON for production use?
Absolutely. Toggle between pretty-printed human-readable format and compact minified output. Minified JSON removes all whitespace and line breaks for the smallest possible file size, perfect for production APIs and config files.
Does the formatter support large JSON files?
Yes, large JSON files are handled well. Since everything processes locally in your browser, the only limit is your device memory. Most API responses and config files format instantly, even with thousands of lines.
Is JSON Formatter free, and do I need to sign up or upload my files?
JSON Formatter is 100% free to use with no signup, no registration, and no usage limits. All processing happens locally in your browser - your files and data never leave your device, so no upload is required and your privacy is fully protected.