问题
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.
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);
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;
Terminal
[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.
回答1:
The problem comes from your connection to MongoDB via Mongoose.
Short version :
You have entered a bad login URL:
mongoose.connect('mongodb://localhost:apiAuth');
^^^^^^^
I think you want to write (or something close to it):
mongoose.connect('mongodb://localhost:'+apiAuth);
Here's an example of a MongoDB login URL : mongodb://127.0.0.1:27017/my_db
.
Or the doc: Standard Connection String Format
Long version :
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).
- Isolate the code that generates the error: You can simply comment on parts of your code to determine which zone is crashing.
- 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.
This kind of technique works in a lot of cases.
回答2:
I also have same error as like above (Error: Slash in host identifier). I resolved the issue. I am accessing mongooses as like below. My database password contains @ so here is the problem when our password having @ special character we need to pass with the help of encodeURIComponent. I passed the user name and password as like below its working fine for me.
Error:
mongoose.connect('mongodb://xxx-xx:7a?VNXd@@sabfpV8=gRLwnNvC_8@196.89.12.168:27017/xxxxx',function(err,db){
if(err){
console.log(err);
}else {
console.log('connected to the Test db');
}
});
Resolved code:
mongoose.connect('mongodb://xxx-xx:'+encodeURIComponent("7a?VNXd@#@safpV8=gRLwnNvC_8")+'@196.89.12.168:27017/xxxxx',function(err,db){
if(err){
console.log(err);
}else {
console.log('connected to the Test db');
}
});
回答3:
I was facing similar error, what i did is
Previous Error Causing Version:
mongoose.connect("mongodb://localhost:cat_app");
Working Version
mongoose.connect("mongodb://localhost/cat_app");
Both are same except : is replaced with /
来源:https://stackoverflow.com/questions/49682075/unhandledpromiserejectionwarning-error-slash-in-host-identifier