DeprecationWarning & mongoErrorContextSymbol errors when starting project on Mac

[ysiddhapura]

After entering the command 'npm start'
Getting these errors:
-DeprecationWarning: current Server Discovery and Monitoring engine is deprecated
-connection error MongoNetworkError: failed to connect to server [cluster0-shard-00-02-fy0po.mongodb.net:27017] on first connect [MongoNetworkError: connection 10 to cluster0-shard-00-02-fy0po.mongodb.net:27017 closed

• Any debugging help with this issue would be appreciated.

[hardikpatil]

same

[kbuffardi]

Note: quoting error messages as text is preferable since it is searchable, opposed to images.

That said, Google turned up some potential fixes. Start your exploration here and let us know of your updates: https://stackoverflow.com/questions/57895175/server-discovery-and-monitoring-engine-is-deprecated/57899638#57899638

[ysiddhapura]

By adding 'useUnifiedTopology: true' to -> mongoose.connect(db, { useNewUrlParser: true, useUnifiedTopology: true }); in the files: app.js, sale.js and users.js resolved the initial DeprecationWarning and the initial MongoNetworkError.

Now able to load the home page.

mongoErrorContextSymbol error still persists, when navigating to the Register/Sign In pages.
The server closes with a
-connection error MongooseError [MongooseServerSelectionError]: connection to 52.54.19.162:27017 closed |
reason: TopologyDescription
type: 'ReplicaSetNoPrimary',
error: MongoNetworkError: connection to 52.54.19.162:27017 closed
[Symbol(mongoErrorContextSymbol)]

[shubhamlatkar]

I think the issue is with with mongo cluster as it was connecting to the mongo db atlas cluster of subhed from keys.js

mongodb+srv://subhed:Smart%[email protected]/

And subhed might have closed the read-write access to his cluster:

So I tried to fix it with docker containerised MongoDB Issue-fix

You can test the code using the docker:

Docker-compose

docker-compose up

Brower

  http://localhost:3000/