diff --git a/backend/src/api.ts b/backend/src/api.ts
index a527732..dece1ea 100644
--- a/backend/src/api.ts
+++ b/backend/src/api.ts
@@ -66,7 +66,7 @@ export class Session {
     }
   };
   run = async () => {
-    const { repl, file, run } = this.config;
+    const { repl, file, suffix, run } = this.config;
     if (this.term) {
       this.term.kill();
     }
@@ -82,8 +82,12 @@ export class Session {
     );
     let cmdline: string[];
     if (this.code || !repl) {
+      let code = this.code;
+      if (suffix) {
+        code += suffix;
+      }
       await new Promise((resolve, reject) =>
-        fs.writeFile(path.resolve(tmpdir, file), this.code, (err) => {
+        fs.writeFile(path.resolve(tmpdir, file), code, (err) => {
           if (err) {
             reject(err);
           } else {
diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index 856dc5b..3978b15 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -1,6 +1,8 @@
 export interface LangConfig {
   repl?: string[];
   file?: string;
+  prefix?: string;
+  suffix?: string;
   run?: string[] | string;
   monacoLang: string;
   name: string;
@@ -65,7 +67,8 @@ export const langs = {
   nodejs: {
     repl: ["node"],
     file: "main.js",
-    run: 'node -i -e "$(< main.js)"',
+    suffix: '\n;require("repl").start();',
+    run: "node main.js",
     name: "Node.js",
     monacoLang: "javascript",
   },
diff --git a/scripts/docker-install.bash b/scripts/docker-install.bash
index 96810f8..91b60ba 100755
--- a/scripts/docker-install.bash
+++ b/scripts/docker-install.bash
@@ -12,13 +12,16 @@ uid="$1"
 
 export DEBIAN_FRONTEND=noninteractive
 apt-get update
-apt-get install -y curl gnupg
+apt-get install -y curl gnupg lsb-release
 rm -rf /var/lib/apt/lists/*
 
 curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
+curl -sS https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
 
-tee -a /etc/apt/sources.list.d/yarn.list >/dev/null <<"EOF"
+tee -a /etc/apt/sources.list.d/custom.list >/dev/null <<"EOF"
+deb https://deb.nodesource.com/node_14.x focal main
 deb https://dl.yarnpkg.com/debian/ stable main
+deb-src https://deb.nodesource.com/node_14.x
 EOF
 
 packages="