JSON Formatter & Validator
Format, validate, or export your JSON directly in your browser securely.
Why format JSON locally?
Sending your proprietary JSON configurations, developer tokens, or customer data to random web servers is an enormous privacy risk. Our JSON Formatter & Validator parses strings and converts them entirely on your local machine.
100% Client-Side Validation
We use native browser Javascript engines to validate your JSON directly inside this application. Because it functions on the frontend, there is no latency, making it the fastest and most secure JSON checking utility available.
Frequently Asked Questions
Can I convert JSON to Excel or CSV?
Yes! Use the 'Export as CSV' button. It will instantly parse arrays of JSON objects into a structured comma-separated-value format that you can easily open in Microsoft Excel, Google Sheets, or Apple Numbers.
Is there a file size limit for minifying JSON?
This tool can handle massive JSON files—up to tens of megabytes—instantaneously, bounded only by the memory limit of your browser. Unlike server-side tools, there is no hard cap or upload timeout.
Why is my JSON invalid?
Common culprits include missing quotes around keys, trailing commas inside arrays or objects, or using single quotes instead of double quotes. Our validator will catch these and throw an error to help you identify the culprit.