MongoDB not authorized error on Ubuntu 16.04 - node.js

Question

I am installing a server on Digitalocean and have a MongoDB issue. I installed Mongo on the server and allowed remote access.
I created two users. One is super-user for me and the other is a regular user for the website users. I am able to connect to the mongo through Robomongo 3T (a mongo client) remotely for both users.
However, when I use the application from a browser, a simple login request gives an authentication error. Here is the error:
MongoError: not authorized on DATABASE_NAME to execute command { find: "users", filter: { email: "YYY", password: "XXX" }, limit: 1, singleBatch: true, batchSize: 1 }
Here is the realted server-side code:
Connecting the database at server.js:
MongoClient.connect(config.mongo_url, (err, client) => {
if(err) throw err
console.log('db connected')
app.locals.db = client
// start the server
app.listen(process.env.PORT || 3000, ()=>console.log('listening on port 3000!'))
});
Trying to connect to the local mongo on the server:
database.collection(config.mongo_col_user)
.findOne({
email: username,
password: hash
}, (err, user)=>{
if(err) return done(err)
if(!user) return done(null, false, {msg: 'not found'})
if(user.password)
return done(null, user)
})
I use pm2 on the server side and I use ecosystem.config.js which has the below code:
module.exports = {
apps : [
{
name: "NAME",
script: "SCRIPT_NAME",
watch: true,
env: {
"mongo_url": 'mongodb://USER_NAME:PASSWORD#localhost:27017?authMechanism=SCRAM-SHA-1&authSource=DATABASE_NAME',
"mongo_db_name": 'DATABASE_NAME',
"mongo_col_query": "COLLECTION_NAME",
}
}
]
}
Could you help with the problem please?

Answer 1

I have figured it out.
When I did make changes to pm2 environment file ecosystem.config.js, I did always restart pm2 with pm2 restart all. However, when you change the file, you should tell pm2 that you changed it by pm2 reload ecosystem.config.js --update-env.
Additionally, the correct syntax is no
mongodb://USER_NAME:PASSWORD#localhost:27017?authMechanism=SCRAM-SHA-1&authSource=DATABASE_NAME'
but
mongodb://USER_NAME:PASSWORD#localhost:27017/DATABASE_NAME'