FSET

FSET is a web-based visual editor for creating and managing JSON Schemas. Instead of writing schema code by hand, you build data structures using a visual interface based on algebraic data types. The tool translates your visual definitions into properly formatted JSON Schema, handling complex types like records, tuples, dictionaries, lists, and tagged unions. This approach eliminates the need for manual coding and reduces errors in schema definition.

The editor works with essential keyboard commands for adding, moving, cloning, and reorganizing schema elements. A key feature is its reference tracking system, which automatically updates all references when you change a type's name or namespace. The tool also prevents you from deleting types that are referenced elsewhere, ensuring schema integrity. When your schema is complete, FSET exports it as a single bundled JSON file that validators can use directly.

FSET is particularly useful for developers and data engineers who work with JSON Schema regularly. It simplifies the process of creating complex data models for APIs, configuration files, or data validation systems. The tool is currently in closed beta, focusing on providing a solid foundation for schema creation without requiring programming expertise.