JSON Formatter – Format, Validate & Minify JSON

JSON (JavaScript Object Notation) is the universal data format for APIs and configuration files. Formatting adds consistent 2-space indentation and newlines to make it human-readable. Minifying strips all whitespace to reduce transfer size.

The validator runs JSON.parse() on your input. If parsing succeeds, the JSON is structurally valid. If it fails, the browser engine returns an error message identifying the problem — such as a missing comma, unclosed bracket, or unquoted key.

Tree view renders JSON as a collapsible hierarchy — similar to how browser DevTools display JSON responses. Click any object {} or array [] node to collapse or expand it. This makes it easy to navigate large, deeply nested JSON structures.

Yes. All processing happens entirely in your browser using JavaScript. No data is sent to any server. You can safely paste sensitive API responses or configuration data.