Only use 1 connection in multiple files

[a2b (Anatole Debierre)]

Hey. I’m working on a backend system that includes multiple node.js files. It means that in each of the files using MongoDB, I have to open a new connection using MongoClient.connect().

But the thing is, that MongoDB doesn’t really seem to like it: I got multiple deprecation errors in the console:

the options [servers] is not supported
the options [caseTranslate] is not supported
the options [dbName] is not supported
the options [srvHost] is not supported
the options [credentials] is not supported
[sometimes more]

So my question is: How can I open only 1 connection, so I can use it in all my files? Since the code looks like that

MongoClient.connect((err) => { // err handling
    // code using the database
});

not like that

MongoClient.connect((err) => /* err handling */)
// code using the database

I can’t figure out how to find an answer.

Thanks in advance for your help.

[Pavel_Duchovny]

Hi @a2b,
What is placed as the connection string for this client?

What is the minPoolSize and maxPoolSize? They should be both set to 1.

Best
Pavel

[a2b (Anatole Debierre)]

The issue has been solved with this StackOverflow question.