How do I manage MongoDB connections in a Node.js web application?

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The primary committer to node-mongodb-native says:

You open do MongoClient.connect once when your app boots up and reuse
the db object. It’s not a singleton connection pool each .connect
creates a new connection pool.

So, to answer your question directly, reuse the db object that results from MongoClient.connect(). This gives you pooling, and will provide a noticeable speed increase as compared with opening/closing connections on each db action.

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