About this tool
The JSON Formatter takes raw, unformatted JSON and outputs it with consistent indentation and line breaks, making it immediately readable. It also validates the JSON as it formats, flagging syntax errors with a clear error message so you can identify and fix problems quickly.
Minified or machine-generated JSON is difficult to read and nearly impossible to debug by eye. When you receive an API response, a config file, or log output in compact form, running it through a formatter is the first step to understanding its structure. This tool gives you clean, properly indented output in one click.
The formatter uses 2-space indentation by default, which is the most common standard for readable JSON. Error detection catches issues like trailing commas, missing brackets, and unquoted keys, helping you understand where the invalid JSON starts to break down.