Mongo 连接有错误 TypeError: Cannot read property 'split' of null答案

【问题标题】：Mongo connection has an error TypeError: Cannot read property 'split' of nullMongo 连接有错误 TypeError: Cannot read property 'split' of null
【发布时间】：2021-03-07 13:17:59
【问题描述】：

我在尝试连接 Cloud Atlas MongoDB 时遇到了问题。我可以连接我的本地 MongoDB，但是在尝试连接 Cloud Atlas MongoDB 时，我遇到了这个问题。有谁知道错误是什么意思？以及如何解决。

DBConnection.js

const mongoose = require("mongoose");
require("dotenv").config();

const CONNECTION_URL = process.env.MONGODB_URI_Saket;

mongoose.connect(CONNECTION_URL, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
});

process.on("SIGINT", async () => {
    await mongoose.connection.close();
    process.exit(0);
});

mongoose.connection.on("connected", () => {
    console.log("Mongo has connected succesfully");
});
mongoose.connection.on("reconnected", () => {
    console.log("Mongo has reconnected");
});
mongoose.connection.on("error", (error) => {
    console.log("Mongo connection has an error", error);
    mongoose.disconnect();
});
mongoose.connection.on("disconnected", () => {
    console.log("Mongo connection is disconnected");
});

服务器.js

const express = require("express");
const cors = require("cors");
const logger = require("morgan");
require("dotenv").config();
const bodyParser = require("body-parser");
require("./database/mongodbinit");
const app = express();

app.use(bodyParser.urlencoded({ extended: true }));

app.use(cors());
app.use(express.json());
app.use(logger("dev"));

const allroutes = require("./routes/index");

app.use(allroutes);

app.get("/", (req, res, next) => {
  res.send("hello world");
});

/** catch 404 and forward to error handler */
app.use("*", (req, res) => {
  return res.status(404).json({
    success: false,
    message: "API endpoint doesnt exist",
  });
});

app.use(function (err, req, res, next) {
  if (err.message) {
    res.status(400).send(err.message);
  } else {
    err.message = "internal server error";
    res.status(500).send(err.message);
  }
});

const PORT = process.env.Port || 8080;
app.listen(PORT, () => {
  console.log(`http://localhost:${PORT}`);
});

MongoDB_URI

MONGOURI=mongodb+srv://${process.env.DB_USER}:${process.env.DB_PASS}@cluster0.2sn1f.mongodb.net/${process.env.DB_NAME}?retryWrites=true&w=majority

我已经在 .env 中为 DB_USER、DB_PASS 和 DB_NAME 分配了值。

【问题讨论】：

标签： node.js mongodb express mongoose

【解决方案1】：

您无法访问 .env 文件中的 process.env。您应该使用用户名和密码编写完整的 url。 .env 用于存储敏感数据，因此可以将数据库的完整 url 和凭据放入其中。

另一种方法是：

const options = {
  db: { native_parser: true },
  server: { poolSize: 5 },
  replset: { rs_name: 'yourSetName' },
  user: 'yourUserName',
  pass: 'yourPassword',
  promiseLibrary: global.Promise
}
mongoose.connect(uri, options).then(conn=>{}).catch(err=>{});

【讨论】：