diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index 3ac9766..61b41e6 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -1773,6 +1773,145 @@ PLEASE GIVE UP
     // but we can't do any better.
     runReplOutput: `"Hello, world!"`,
     template: `"Hello, world!"
+`,
+  },
+  jsf: {
+    name: "JSF***",
+    main: "main.js",
+    run: `sed 's/[^[]()!+]//g' main.js | node`,
+    template: `[][(![]+[])[+[]]+(![]+[])[!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+[]]][([]+[][(![]
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   },
   julia: {