Node.js 应用无法连接到 MongoDB Atlas 集群

Question

错误：服务器在端口 5000 上以开发模式运行 errorMongoParseError：不支持选项 usecreateindex [nodemon] 应用程序崩溃 - 在启动前等待文件更改...

数据库.js

const connectDB = async () => {
  try {
    const conn = await mongoose.connect(process.env.MONGO_URI, {
      useUnifiedTopology: true,
      useNewUrlParser: true,
      useCreateIndex: true,
    });
    console.log(`MongoDB connected :${conn.connection.host}`);
  } catch (error) {
    console.error(`error${error}`);
    process.exit(1);
  }
};
export default connectDB;

服务器.js

import express from "express";
import dotenv from "dotenv";
import connectDB from './config/db.js'
import products from './data/products.js'


dotenv.config();

connectDB()

const app = express();

app.get("/", (req, res) => {
  res.send("api is running... ");
});

app.get("/api/products", (req, res) => {
  res.json(products);
});

app.get("/api/products/:id", (req, res) => {
  const product = products.find(p => p._id === req.params.id);
  res.json(product);
});


const PORT = process.env.PORT || 5000

app.listen(PORT, console.log(`server running in ${process.env.NODE_ENV} mode on port ${PORT}`));

Answer 1

不再有弃用警告选项

Mongoose 文档

useNewUrlParser、useUnifiedTopology、useFindAndModify 和 useCreateIndex 不再是受支持的选项。 ZCCADCDEDB567ABAE643E15DCF0974E503Z 6 总是表现得好像 useNewUrlParser、useUnifiedTopology 和 useCreateIndex 为 true，而 useFindAndModify 为 false。 请从您的代码中删除这些选项。

数据库.js

const connectDB = async () => {
  try {
    const conn = await mongoose.connect(process.env.MONGO_URI, {
      // useUnifiedTopology: true, <-- no longer necessary
      // useNewUrlParser: true, <-- no longer necessary
      // useCreateIndex: true, <-- no longer necessary
    });
    console.log(`MongoDB connected :${conn.connection.host}`);
  } catch (error) {
    console.error(`error${error}`);
    process.exit(1);
  }
};
export default connectDB;