JSON Editor

JSON Editor by VDT Labs is a native Mac app for editing JSON files, featuring a built-in HTTP client for API testing. Key features include local-only operation for privacy, “tree” and “text” modes for easy editing, error detection, minimal change tracking for source control, and customizable sorting and searching options. It supports OAuth 2.0, offers various customization features, and receives positive user feedback for its functionality and developer support.

https://vdt-labs.com/json-editor/