first commit

backend/services/db.js

@@ -0,0 +1,18 @@
+const MongoClient = require("mongodb").MongoClient;
+const connectionString = "mongodb://db:27017";
+const client = new MongoClient(connectionString);
+
+let db;
+
+const connectDb = async () => {
+  if (db) return db;
+  try {
+    const conn = await client.connect();
+    db = conn.db("jucundus");
+    return db;
+  } catch(e) {
+    console.error(e);
+  }
+};
+
+module.exports = connectDb;