add files

.gitignore

+node_modules
\ No newline at end of file

index.js

+var express = require('express');
+var queue = require('express-queue');
+var app = express();
+ 
+function delay(time) {
+    return new Promise((resolve) => {
+        setTimeout(resolve
+        , time);
+    });
+}
+// Using queue middleware
+app.get('/book', queue({ activeLimit: 1, queuedLimit: -1 }), async (req, res) => {
+    console.log('begin booking');
+    await delay(5000);
+    res.json({
+        bookingCode: '12345'
+    });
+});
+
+app.listen(3000);

package.json

+{
+  "name": "express-queue-demo",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "dependencies": {
+    "express": "^4.17.1",
+    "express-queue": "^0.0.12"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "start": "node index",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git@gitlab.softsq.com:archawat.l/express-queue-demo.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}