JSON Formatter

JSON (JavaScript Object Notation) is the dominant data interchange format on the web — used by REST APIs, configuration files, database export/import, and inter-service communication. Despite its simplicity, minified or auto-generated JSON is difficult to read and debug. A missing comma, an extra closing bracket, or a trailing comma (invalid in strict JSON) can silently break a parser. The JSON Formatter parses your input using the browser's native JSON.parse(), which catches all structural errors and pinpoints the approximate location of the problem.

Beyond validation, this tool helps in three common developer scenarios: debugging API responses (paste the raw response body to immediately understand its structure), preparing config files (format with consistent 2-space or 4-space indentation to match your project style guide), and reducing payload size (minify JSON before embedding it in a script tag or sending it in a POST body). The tool processes JSON entirely in the browser — no data is sent to any server, which matters when working with sensitive API responses or internal configuration data.