A browser based Emulator for Microsoft Expression Language - used in Power Automate, Logic Apps and Azure Data Factory.
The intent of the emulator is for new users to quickly build and try Expression Language statements without having to run their flow/app/pipeline first.
The emulator requires nothing server side and can be hosted statically: for example at nonodename.com
Fire up a web server of your preference with root in the /code directory. Python works well: python3 -M http.server
Feel free to fork and issue pull requests and/or log issues.
Microsoft: I'd be very happy for you to pick this up and embed in the relevant authoring environments. Please get in touch if interested.