After successfully running the server locally, I encountered an error upon deploying to Vercel:
TypeError: Cannot read properties of undefined (reading 'startsWith') at connectionStringHasValidScheme (/var/task/server/node_modules/mongodb-connection-string-url/lib/index.js:9:30) at new ConnectionString (/var/task/server/node_modules/mongodb-connection-string-url/lib/index.js:85:34) at parseOptions (/var/task/server/node_modules/mongodb/lib/connection_string.js:201:17) at new MongoClient (/var/task/server/node_modules/mongodb/lib/mongo_client.js:46:63) at Object.<anonymous> (/var/task/server/db/conn.js:3:16) at Module._compile (node:internal/modules/cjs/loader:1159:14) at Module._extensions..js (node:internal/modules/cjs/loader:1213:10) at Module.load (node:internal/modules/cjs/loader:1037:32) at Module._load (node:internal/modules/cjs/loader:878:12) at Module.require (node:internal/modules/cjs/loader:1061:19)I have tried researching this issue, but I haven't been able to find a solution so far.
server.js
const express = require("express");
const app = express();
const cors = require("cors");
const bp = require('body-parser');
require("dotenv").config({ path: "./db/config.env" });
const port = process.env.PORT || 5000;
app.use(cors());
app.use(express.json());
app.use(require("./routes/auth"));
app.use(require("./routes/user"));
const dbo = require("./db/conn");
app.listen(port, () => {
dbo.connectToServer(function (err) {
if (err) console.error(err);
});
console.log(`Server is running on port: ${port}`);
});
conn.js
const { MongoClient } = require("mongodb");
const Db = process.env.ATLAS_URI;
const client = new MongoClient(Db, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
var _db;
module.exports = {
connectToServer: function (callback) {
client.connect(function (err, db) {
// Verify we got a good "db" object
if (db)
{
_db = db.db("preview");
console.log("Successfully connected to MongoDB.");
}
return callback(err);
});
},
getDb: function () {
return _db;
},
};
I attempted to isolate the problematic code segment in order to troubleshoot it, but unfortunately, without success.