wha? rule

Elm is the loveliest and easiest to maintain long-term language I have ever used, by far. People don't know what easy to maintain really means unless they've come back to an elm project that's years old that they've not touched in a long while. Adding new stuff or changing old stuff is a breeze.

And it's bulletproof. You simply don't get runtime errors. (Well, about a millionth as many according to one firm.) We've never seen one in production at my company, we only get any when we put them in with a debug trace, which elm only lets you compile in dev mode.

Elm compiles to javascript so started life as a front end only language, but you can use platform workers on the backend, but now there's

elm-pages which is a thorough look at elm on the backend, complete with backend tasks and data sources.

(Honorable mention to elm-land which is to elm as next.js is to react. elm-pages started off as a solution in a similar space to elm-land, but has evolved into an elm-on-the-backend solution.)

The most paradigm busting and comprehensive solution to full stack elm is lamdera which is elm all the way and handles front end, back end and communication between them. Imagine your compiler automatically handled frontend/backend communication including encoding, transport & decoding, but also live version migrations of anything and everything, deployment, data encoding and persistence on the backend and even hosting, all very very robustly and reliably.