solved issue: export func returned run func(),not promise

index.js

@@ -2,8 +2,6 @@ const express = require("express");
 const insertDb = require("./insertdb");
 require("dotenv").config();
 
-const DB_URL = process.env.DB_CREDENTIALS;
-
 app = express();
 app.use(
   express.urlencoded({
@@ -16,10 +14,19 @@ app.get("/", (req, res) => {
   res.send("you are at backend root");
 });
 
-app.post("/register", (req, res) => {
-  console.log(req.body);
-  insertDb(req.body.name, req.body.email, req.body.password);
-  res.send("registration recived!");
+app.post("/register", async (req, res) => {
+  try {
+    const result = await insertDb(
+      req.body.name,
+      req.body.email,
+      req.body.password
+    ).catch(console.dir);
+    if (result) {
+      res.send("registration success!");
+    } else {
+      res.send("registration failed");
+    }
+  } catch (error) {}
 });
 
 app.listen(PORT, (req, res) => {

insertdb.js

@@ -1,26 +1,28 @@
 const { MongoClient } = require("mongodb");
 
-module.exports = function (name, email, password) {
+module.exports = async function (name, email, password) {
   const uri = process.env.DB_CREDENTIALS;
 
   const client = new MongoClient(uri);
+  let successOrFail = false;
+  try {
+    await client.connect();
 
-  async function run() {
-    try {
-      await client.connect();
+    const database = client.db("4learn");
+    const collection = database.collection("userReg");
 
-      const database = client.db("4learn");
-      const collection = database.collection("userReg");
+    // create js obj received by /register
 
-      // create js obj received by /register
+    const doc = { name: name, email: email, password: password };
+    const result = await collection.insertOne(doc);
 
-      const doc = { name: name, email: email, password: password };
-      const result = await collection.insertOne(doc);
-
-      console.log(`${result.insertedCount} documents were inserted into db`);
-    } finally {
-      await client.close();
+    console.log(`${result.insertedCount} documents were inserted into db`);
+    console.log(result.insertedCount > 0);
+    if (result.insertedCount > 0) {
+      successOrFail = true;
+      return true;
     }
+  } finally {
+    await client.close();
   }
-  run().catch(console.dir);
 };