应用程序中发生错误，无法提供您的页面将 Node.Js REST 部署到 heroku

Question

我是使用 Heroku 部署 REST api 的新手。我已经在 Node.JS 中编写了一个 REST api，现在我想将它部署到 Heroku。请问有分步方法吗

我在 Heroku 上收到此错误

Application error
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command
heroku logs --tail

在我的桌面上，在 Postman 上测试它运行良好。但我无法从浏览器查看

https://test-restapi2.herokuapp.com/employees

我的 Node.Js 应用如下所示：

var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var mysql = require('mysql');

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

app.get('/',function(req , res){
    return res.send({error: true,message: 'hello'})
});

var dbConn = mysql.createConnection({
    host: 'xxxxxxxxxxxxxxxx',
    user: 'xxxxxxxxxxxxxx',
    password: 'xxxxxxxxxxx',
    database: 'xxxxxxxxxxxxxxxxx'
});

dbConn.connect();

app.get('/employees',function(req,res){
    dbConn.query('SELECT * FROM employeedb',function(error, results, fields){
        if (error) throw error;
        return res.send({ error: false, data: results, message: 'users list' });
    });
});



app.listen(5000,function(){
    console.log('App running on port 5000');
});

module.exports = app;

请问我该如何解决这个问题？

编辑

查看日志，我看到了：

    2021-10-09T19:28:55.666772+00:00 heroku[web.1]: State changed from crashed to starting
2021-10-09T19:28:57.813040+00:00 heroku[web.1]: Starting process with command `npm start`
2021-10-09T19:28:59.202356+00:00 app[web.1]: npm ERR! missing script: start
2021-10-09T19:28:59.208564+00:00 app[web.1]: 
2021-10-09T19:28:59.208837+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2021-10-09T19:28:59.208892+00:00 app[web.1]: npm ERR!     /app/.npm/_logs/2021-10-09T19_28_59_202Z-debug.log
2021-10-09T19:28:59.327035+00:00 heroku[web.1]: Process exited with status 1
2021-10-09T19:28:59.422562+00:00 heroku[web.1]: State changed from starting to crashed
2021-10-09T19:29:04.931511+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=test-restapi2.herokuapp.com request_id=aafd0e0b-988e-4673-9359-f7576e340d75 fwd="154.120.87.9" dyno= connect= service= status=503 bytes= protocol=https
2021-10-09T19:29:06.103970+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=test-restapi2.herokuapp.com request_id=6b375048-c8db-4323-8484-ba60aafea022 fwd="154.120.87.9" dyno= connect= service= status=503 bytes= protocol=https
2021-10-09T19:32:15.776019+00:00 app[api]: Starting process with command `npm start` by user emeka1987ng@gmail.com
2021-10-09T19:32:17.857845+00:00 heroku[run.9636]: Awaiting client
2021-10-09T19:32:17.890327+00:00 heroku[run.9636]: Starting process with command `npm start`
2021-10-09T19:32:17.959936+00:00 heroku[run.9636]: State changed from starting to up
2021-10-09T19:32:21.444257+00:00 heroku[run.9636]: Process exited with status 1
2021-10-09T19:32:21.499239+00:00 heroku[run.9636]: State changed from up to complete
2021-10-09T19:32:28.775794+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/employees" host=test-restapi2.herokuapp.com request_id=1a03731f-41cb-438d-b877-c1e49d5dd039 fwd="107.155.108.143" dyno= connect= service= status=503 bytes= protocol=https
2021-10-09T19:32:39.195421+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/employees" host=test-restapi2.herokuapp.com request_id=c1833124-6596-4401-a765-f8a65345b5e1 fwd="52.204.27.85" dyno= connect= service= status=503 bytes= protocol=https

Answer 1

您可以查看应用程序的日志并确定问题。

在您的项目页面右上角，有一个“更多”按钮。 单击此处，然后单击“查看日志”，您应该能够看到确切的问题并修复它。