JSON Formatter & Validator

JSON (JavaScript Object Notation) is the de-facto format for API requests and responses, configuration files and data interchange between services. The problem is that most of the JSON you encounter in the wild is minified onto a single line, or worse, subtly broken. A single missing comma, a stray trailing comma or an unescaped quote turns a perfectly good payload into an error that takes time to trace.

A JSON formatter and validator solves both problems in one step. It parses your input, pinpoints the exact line and column of any syntax error, and re-prints valid JSON with clean, predictable indentation — two or four spaces — so you can read nested structures, spot mistakes and share readable payloads in documentation or bug reports. It also produces the minified form useful for reducing transfer size in scripts and CI fixtures.

Because this utility runs 100% in your browser, you can format production payloads, customer records or internal API responses without worrying about the data being uploaded, logged or stored anywhere. The result is effectively instant, works offline, and keeps your most sensitive JSON exactly where it belongs: on your machine.