start

.gitignore

@@ -0,0 +1,2 @@
+*.swp
+node_modules

package.json

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+{
+  "name": "heroku_test",
+  "version": "1.0.0",
+  "description": "",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.18.2"
+  }
+}

server.js

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+const express = require('express');
+const app = express();
+
+let PORT = 3000;
+if(process.env.PORT){
+	PORT = process.env.PORT
+}
+app.listen(PORT, ()=>{
+	console.log('listening');
+})