{ }JSON Formatter & Validator
Pretty-print or minify JSON. Reports syntax errors and supports key sorting. Useful for API response debugging, config file review, log/monitoring data analysis, and external data source cleanup.
🔒 Browser-based✓ No watermark✓ No signup
How to use
- 1Paste your JSON string.
- 2Press format, minify, or sort keys.
- 3Validation results display automatically.
FAQ
What indentation options are available?+
Choose between 2 spaces, 4 spaces, or tab.
Does it handle large JSON?+
Up to several MB without issues, within browser memory limits.
Does it parse JSON5 with comments?+
Standard JSON doesn't allow comments. JSON5 and JSONC need a separate parser, so they're not supported.
Can I find where the error is?+
Yes — error position (line/column) and the cause are displayed. Quickly find missing quotes, commas, or brackets.
Can I sort keys alphabetically?+
Yes — the sort option rearranges all keys alphabetically. Useful for diff/git consistency.
How much does minification save?+
Removing whitespace and newlines typically saves 20–40%. Efficient for large JSON transmission.