JSONDevKit

JSONDevKit is a browser-based toolkit for developers who work with JSON every day. It lets users format, beautify, minify, inspect, and validate JSON in a clean workspace without sending data to a server. The app includes a tree viewer for nested structures, a side-by-side JSON compare tool for spotting added, removed, and changed values, and JSON Schema validation for checking payloads against schemas. It also supports converting JSON into YAML, CSV, and XML. Everything runs fully on the client side, making it useful for fast, privacy-first JSON workflows during API development, debugging, testing, and data inspection.