JSON Formatter & Validator
Paste your JSON below to format, minify or validate it. Everything runs locally in your browser — nothing is sent to a server.
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Frequently Asked Questions
Is my JSON data uploaded anywhere?
No. Formatting, minifying and validation all happen locally in your browser using JavaScript. Your data never leaves your device.
What happens if my JSON is invalid?
An error message will explain what went wrong, including the position of the syntax error when available.
Can I format very large JSON files?
Yes, though extremely large files (tens of megabytes) may be slower since processing happens in your browser.