Developer
JSON Formatter and Validator
Format, minify, and validate JSON in the browser without uploading data.
About this json formatter
Format messy JSON, validate API responses, minify payloads, and inspect errors without sending private data to a server.
Mavis Tools is built for quick utility work: paste the input, get the result, and move on. The page is static-first for speed, and the interactive work happens in your browser. That makes it useful for drafts, calculations, debugging snippets, and repeat everyday tasks.
This tool is intentionally focused. It does one job clearly instead of asking for an account or hiding the result behind a long workflow. Bookmark it if you need a fast json formatter that works on desktop and mobile.
FAQ
Does it validate JSON?
Yes. Invalid JSON shows a parse error so you can fix it.
Can it minify JSON?
Yes. Use the minify button to remove unnecessary whitespace.
Is API data uploaded?
Yes. The tool runs in your browser, and the input is not uploaded to a server.