上传到 Heroku 时出现应用程序错误

Question

对于我的应用程序后端，我尝试在 heroku 上托管。在 heroku 上创建新应用程序后，我按照它向我展示的所有步骤进行操作并成功部署。但是当我转到 link 时，它给我应用程序错误。我试图通过 heroku logs --tail 获取日志，它给了我这个

2021-12-29T07:57:12.741895+00:00 app[web.1]: Error:  The `uri` parameter to `openUri()` must be a string, got "undefined". Make sure the first parameter to `mongoose.connect()` or `mongoose.createConnection()` is a string.
2021-12-29T07:57:12.751654+00:00 app[web.1]: [nodemon] clean exit - waiting for changes before restart
2021-12-29T07:58:11.201323+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2021-12-29T07:58:11.236815+00:00 heroku[web.1]: Stopping process with SIGKILL
2021-12-29T07:58:11.259774+00:00 app[web.1]: Error waiting for process to terminate: No child processes
2021-12-29T07:58:11.400798+00:00 heroku[web.1]: Process exited with status 22
2021-12-29T07:58:11.473743+00:00 heroku[web.1]: State changed from starting to crashed
2021-12-29T08:56:18.088383+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=pin-map-app.herokuapp.com request_id=30848095-cca3-4afe-b1ac-705529a0b023 fwd="103.166.88.18" dyno= connect= service= status=503 bytes= protocol=https
2021-12-29T08:56:19.043794+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=pin-map-app.herokuapp.com request_id=dedb7d05-a475-4e11-972d-e484b397c88e fwd="103.166.88.18" dyno= connect= service= status=503 bytes= protocol=https

如您所见，openUri() 存在一些问题，为此我已经设置了 dotenv 并在我的 index.js 中添加了 dotenv.config()。我尝试 heroku restart 并再次推送所有代码，但问题仍然存在。 index.js

import express from "express";
import mongoose from "mongoose";
import pinRoutes from "./routes/pins.js";
import userRoutes from "./routes/users.js";
import cors from "cors";
import dotenv from "dotenv";

dotenv.config();
const app = express();
app.use(express.json({ limit: "30mb", extended: true }));
app.use(cors());
app.use("/pins", pinRoutes);
app.use("/user", userRoutes);

const PORT = process.env.PORT || 5000;

app.get("/", (req, res) => {
  res.send("welcome to pin it");
});

mongoose
  .connect(process.env.CONNECTION_URL, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })
  .then(() => {
    app.listen(PORT, () => {
      console.log(`Server started on port ${PORT}`);
    });
  })
  .catch((err) => {
    console.log("Error: ", err.message);
  });

在我的 .env 文件中，我只有 CONNECTION_URL，没有别的。我以前部署过一些其他应用程序，但这是我第一次遇到此类错误。

Answer 1

首先：确保所有的独立都安装在package.json

其次：

尽管您设置了正确的环境，但它向您显示 mongoose 错误表明您的第一个错误参数，尝试做直接链接，without .env

只需确保其中连接的端口是：

var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

this just makes the port that connected dynamic
If port 3000 does not work will switch to another one.

听如下：

app.listen(port)

上传到 Heroku 时出现应用程序错误

Application Error while uploading to Heroku

heroku

node.js

听如下：