JSON Formatter
Format, validate, and minify JSON with collapsible tree view
Input JSON
Output
JSON is the standard data format for APIs and configuration files, but it's often delivered as one long, unreadable line of text. This tool formats (pretty-prints) JSON with proper indentation for readability, validates that it's syntactically correct, and can also minify it back down to a compact single line when you need the smallest possible size.
Frequently asked questions
The tool will flag that the JSON is invalid, typically pointing to roughly where the problem is (like a missing comma or unclosed bracket) so you can fix it.
Formatting adds indentation and line breaks to make JSON easy for a human to read. Minifying strips all unnecessary whitespace to make the file as small as possible - useful for production use where file size matters more than readability.
No - formatting and validation happen entirely in your browser.