Format, minify, and inspect JSON structure with indent controls, key sorting, and a visual tree view.
JSON Formatter is a free online tool for formatting JSON with indentation or minifying it to a compact string. It is useful for debugging API responses, configuration files, logs, webhook payloads, and mock data. The tool runs entirely in your browser and does not send data to the server.
Choose a related tool for the next step.
Data passed between tools is kept only in the current browser session.
JSON Formatter quickly brings JSON into a readable form with indentation, or compacts it into a single line. The tool is useful for debugging API responses, configuration files, logs, webhook payloads, mock data, and frontend development.
You can choose 2-space, 4-space, or tab indentation, sort object keys alphabetically, keep Unicode characters readable or escape non-ASCII characters to \uXXXX sequences, and view the parsed JSON as a collapsible structure tree.
All processing is done locally in the browser. Your JSON is not sent to the UtiLab server.