Format, validate and minify JSON with full syntax highlighting. Color-coded keys, strings, numbers and booleans.
JSON (JavaScript Object Notation) is a lightweight text format for storing and exchanging data. It uses key-value pairs and is human-readable. It is the most common data format for web APIs.
Formatting adds indentation and line breaks to make JSON readable by humans. Minifying removes all unnecessary whitespace to reduce file size — useful for production APIs and network transfers.
Common JSON errors include: trailing commas after the last item, single quotes instead of double quotes, unquoted property keys, or missing closing brackets. The validator highlights the exact error.
There is no official limit, but most browsers handle JSON up to several MB in memory fine. This tool processes JSON entirely in your browser with no file size restrictions imposed by us.
Click the Sort Keys button. This recursively sorts all object keys in alphabetical order, which is useful for comparing two JSON objects or producing consistent output.