MongoDB连接：超时错误与未决承诺

Question

问题摘要

我正在尝试运行Nodemon Server，但是我会收到一个超时错误，说[Nodemon]应用程序崩溃了 - 启动之前等待文件更改...。

问题详细信息

我有3个文件，其中包含以下路径：./ server.js，./ index.js和./ api/restaurants.route。 JS。

server.js

import express from "express";
import cors from "cors";
import restaurants from "./api/restaurants.route.js";

// Create a new express application instance 
const app = express();
// apply middleware
app.use(cors());
// parse request body as JSON. Our server can accept JSON data in the body of a request
app.use(express.json());

// specify some routes. This is the path that will be used to access the API 
app.use("/api/v1/restaurants", restaurants);
// If someone goes to a path that doesn't exist, return a 404 error
app.use("*", (req, res) => res.status(404).json({error : "Not found"}));

// export the application instance for use in the rest of the application
export default app

index.js

import app from "./server.js"
import mongodb from "mongodb";
import dotenv from "dotenv";

// Load environment variables from .env file, where API keys and passwords are configured
dotenv.config();
// Get access to the mongo client
const MongoClient = mongodb.MongoClient;

// set port
const port = process.env.PORT || 8000; 

// Connect to the database
MongoClient.connect(
    // The URL of the database to connect to
    process.env.RESTREVIEWS_DB_URI,
    {
        // The options to use when connecting to the database
        maxPoolSize: 50,
        wtimeoutMS: 2500,
        useNewUrlParser: true,
    }
    )
    // If the connection is not successful, throw an error
    .catch(err => {
        console.log(err.stack);
        process.exit(1);

    })
    // If the connection is successful, console log a message
    .then(async client => {
        app.listen(port, () => {
            console.log(`Server listening on port ${port}`);
        });
    });

restaurants.route.js

import express from "express";

// create router instance
const router = express.Router();

// respond to GET requests with hello
router.route("/").get((req, res) => {
    res.send("Hello from restaurants.route.js");
})

export default router;

输出

当我运行Nodemon Server 在终端上，我在终端上获得：

[nodemon] 2.0.16
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node server index.js`

然后几秒钟后

MongoServerSelectionError: connection <monitor> to [redacted] closed
    at Timeout._onTimeout ([redacted]/backend/node_modules/mongodb/lib/sdam/topology.js:306:38)
    at listOnTimeout (node:internal/timers:564:17)
    at process.processTimers (node:internal/timers:507:7)
[nodemon] app crashed - waiting for file changes before starting...

我尝试了什么？

• 我尝试存储mongoclient.connect作为const a = mongoclient.connect（...和控制台记录它，查看其输出。 ; repend＆gt;}
• 尝试评论。
• 我 23:00这是我实际上要实施的代码。

Answer 1

您应该尝试在MongoDB群集中使用白色IP地址。

1. 转到您的MongoDB Atlas项目页面
2. 单击“网络访问”单击
3. “添加当前IP地址”按钮
4. 单击“确认”