Local browser processing
Formatting uses the built-in JSON.parse and JSON.stringify. The content is not sent to our server when this tool is used. Never paste secrets into online tools that you do not trust.
JSON formatter and validator
Paste JSON to format or minify it. Processing takes place entirely in your browser.
Reviewed: 23 September 2026
No account required. Local tools keep your input in your browser.
Frequently asked questions
Is my JSON sent to a server?
No. Formatting, minifying and validation run locally in your browser using its built-in JSON.parse and JSON.stringify.
Why is JSON with single quotes or comments invalid?
Standard JSON requires double quotes around strings and keys, and does not support comments. A JavaScript object is not necessarily valid JSON.
Are trailing commas allowed?
No. A trailing comma after the final object property or array element is not part of standard JSON and will cause validation to fail.
What does Minify do?
It removes unnecessary whitespace and line breaks without changing the meaning of the data. The input must be valid JSON before it can be minified.
Related
Next steps
RelatedURL encode / decodeEncode or decode a URL component with encodeURIComponent and decodeURIComponent, directly in your browser.RelatedBase64 encode / decodeEncode or decode text using Base64 locally. Unicode is supported and your input is not sent to the server.RelatedWord and character counterCount words, characters, characters without whitespace, lines and approximate sentences locally in your browser.