克隆GitHub网站后MongoDB数据库连接失败求助

我从GitHub克隆了一个网站，尝试将其与MongoDB数据库建立连接时出现问题。执行npm run start:dev启动服务器时提示数据库连接成功，但在前端注册用户并向数据库提交数据时出现异常。

db.js代码 #

const mongoose = require("mongoose");
try {
  mongoose.connect("mongodb+srv://AhmedHassan:Knight007@cluster0.ofzz68w.mongodb.net/TestDB?retryWrites=true&w=majority", {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
  });
  console.log("Database Connected Successfully");
} catch (err) {
  console.log("Database Not Connected");
}

app.js代码 #

const express = require("express");
const app = express();
require("dotenv").config();
const mongoose = require("mongoose");
const morgan = require("morgan");
const cookieParser = require("cookie-parser");
const cors = require("cors");

// Import Router
const authRouter = require("./routes/auth");
const categoryRouter = require("./routes/categories");
const productRouter = require("./routes/products");
const brainTreeRouter = require("./routes/braintree");
const orderRouter = require("./routes/orders");
const usersRouter = require("./routes/users");
const customizeRouter = require("./routes/customize");
// Import Auth middleware for check user login or not~
const { loginCheck } = require("./middleware/auth");
const CreateAllFolder = require("./config/uploadFolderCreateScript");

/* Create All Uploads Folder if not exists | For Uploading Images */
CreateAllFolder();

// Database Connection
mongoose
  .connect(process.env.DATABASE, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
  })
  .then(() =>
    console.log(
      "==============Mongodb Database Connected Successfully=============="
    )
  )
  .catch((err) => console.log("Database Not Connected !!!"));

// Middleware
app.use(morgan("dev"));
app.use(cookieParser());
app.use(cors());
app.use(express.static("public"));
app.use(express.urlencoded({ extended: false }));
app.use(express.json());

// Routes
app.use("/api", authRouter);
app.use("/api/user", usersRouter);
app.use("/api/category", categoryRouter);
app.use("/api/product", productRouter);
app.use("/api", brainTreeRouter);
app.use("/api/order", orderRouter);
app.use("/api/customize", customizeRouter);

// Run Server
const PORT = process.env.PORT || 8000;
app.listen(PORT, () => {
  console.log("Server is running on ", PORT);
});

运行情况 #

• 启动服务器后：控制台输出数据库连接成功提示，服务器正常运行在指定端口
• 前端注册用户后：提交数据时出现异常，无法完成用户信息的数据库写入操作

内容的提问来源于stack exchange，提问作者Ahmed Hassan