UnhandledPromiseRejectionWarning 错误:主机标识符中的斜线 [英] UnhandledPromiseRejectionWarning Error: Slash in host identifier

问题描述

我正在尝试在我的终端中运行 nodemon index.js，但我收到以下错误，我完全不知道这意味着什么，因为我很不清楚.

I am trying to run nodemon index.js in my terminal but I am getting the following error which I have absolutely no idea what it means as for me is very unclear.

谁能向我解释一下如何解决这个问题?

Can please anyone explain to me how to solve this?

index.js

const express = require('express');
const morgan = require('morgan');
const bodyParser = require('body-parser');
const mongoose = require('mongoose');

var app = express();

var router = require('./services/router');

mongoose.connect('mongodb://localhost:apiAuth');

app.use(morgan('combined'));
app.use(bodyParser.json());
app.use('/v1', router);

var PORT = process.env.PORT || 3000;
var HOST = process.env.HOST || '127.0.0.1';

console.log('Listening on', HOST, PORT);
app.listen(PORT, HOST);

服务/router.js

services/router.js

var router = require('express').Router();

function protected(req, res, next) {
    res.send('Here is the secret!');
}

router.route('/protected')
    .get(protected);

module.exports = router;

终端

[nodemon] restarting due to changes...
[nodemon] restarting due to changes...
[nodemon] starting `node index.js`
Listening on 127.0.0.1 3000
(node:29104) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): Error: Slash in host identifier
(node:29104) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

推荐答案

问题来自您通过 Mongoose 连接到 MongoDB.

The problem comes from your connection to MongoDB via Mongoose.

简短版本:

您输入了错误的登录网址:

You have entered a bad login URL:

mongoose.connect('mongodb://localhost:apiAuth');
                                      ^^^^^^^

我想你想写(或类似的东西):

I think you want to write (or something close to it):

mongoose.connect('mongodb://localhost:'+apiAuth);

以下是 MongoDB 登录 URL 的示例:mongodb://127.0.0.1:27017/my_db.或文档:标准连接字符串格式

Here's an example of a MongoDB login URL : mongodb://127.0.0.1:27017/my_db. Or the doc: Standard Connection String Format

长版:

问题的解决方法与上述相同，但您可以自己定位.就我而言，我是这样做的(因为我遇到了完全相同的问题，而且信息量也差不多).

The resolution of the problem is the same as above, but you would have located it yourself. For my part, I proceeded like that (because I had exactly the same problem, with as much information).

1. 隔离产生错误的代码:您可以简单地对代码的某些部分进行注释，以确定哪个区域崩溃了.
2. 在与Mongoose的连接后添加一个catch():mongoose.connect(...).catch((e) => { console.log(e); throwe; }.这将直接指示相关行和一些附加信息.

1. Isolate the code that generates the error: You can simply comment on parts of your code to determine which zone is crashing.
2. Add a catch() after the connection with Mongoose: mongoose.connect(...).catch((e) => { console.log(e); throw e; }. This will have indicated directly the line concerned and some additional information.

这种技术在很多情况下都有效.

This kind of technique works in a lot of cases.

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