JsonToolBox is a free, open-source JSON toolkit built for developers, testers, technical writers, and anyone who works with structured data.
It provides browser-based tools for common JSON tasks, including formatting and beautifying JSON, validating syntax, minifying output, viewing JSON in a structured tree, comparing two JSON documents, and converting JSON to other commonly used formats.
JsonToolBox is designed for fast, focused use. You can open a tool, paste your data, perform the required operation, and copy or download the result without creating an account. JSON processing is performed locally in your browser, so your JSON content is not uploaded to a remote server for processing.
Typical use cases include inspecting API responses, debugging configuration files, checking JSON before deployment, preparing examples for documentation, comparing payloads, and converting structured data for development workflows.
The project is open source and available under the MIT License. The complete source code and development information are available on GitHub.
Website: https://jsontoolbox.cc
Source code: https://github.com/kbmjj123/jsontoolbox.cc