FHIR Shorthand (FSH) is a domain-specific language for defining FHIR artifacts. It allows you to define FHIR profiles, extensions, value sets, code systems, and instances in a concise and consistent way.
I've created this tool to make it easier to author and edit FHIR Shorthand. Using this tool, you can edit FSH files directly in your browser. The editor also provides syntax highlighting and allows you to preview the parsed FSH file content.