The James Webb Space Telescope Runs JavaScript, Apparently

"Basically, NASA’s working with a bunch of files that are written in a somewhat human-readable format — if they need to make changes, they can just open up a text editor, do a bunch of testing on the ground, then send the updated file to the JWST. It’s certainly easier (and therefore likely less error-prone) than if every program was written in arcane code that you’d have to recompile if you wanted to make changes."