diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index 0f07bd2..44d6791 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -1169,6 +1169,15 @@ PLEASE GIVE UP
 `,
     timeout: 15,
   },
+  j: {
+    aliases: ["jconsole", "ijconsole"],
+    name: "J",
+    repl: "echo 'ijconsole:' && ijconsole",
+    main: "main.ijs",
+    run: "ijconsole main.ijs",
+    template: `echo 'Hello, world!'
+`,
+  },
   java: {
     aliases: ["javac"],
     name: "Java",
diff --git a/scripts/docker-install-phase4.bash b/scripts/docker-install-phase4.bash
index f7606af..57d73f0 100755
--- a/scripts/docker-install-phase4.bash
+++ b/scripts/docker-install-phase4.bash
@@ -177,6 +177,11 @@ tar -xf ioke-ikj-*.tar.gz -C /opt
 rm ioke-ikj-*.tar.gz
 ln -s /opt/ioke/bin/ioke /usr/local/bin/ioke
 
+# J
+wget -nv "$(curl -sSL https://code.jsoftware.com/wiki/System/Installation/J901/Debian | grep -F '<a' | grep 'amd64\.deb' | grep -Eo 'http://.+?\.deb')"
+dpkg -i j*_amd64.deb
+rm j*_amd64.deb
+
 # Java
 wget -nv https://download.eclipse.org/jdtls/snapshots/jdt-language-server-latest.tar.gz
 mkdir /opt/jdt