How to set MongoClient connection timeout?

Question

I have a server which first connects to MongoDB instance, then starts web server. If MongoDB instance is not available, there is no point to start web server, so I think I need to somehow set a timeout to, say 5 seconds.

How do I do it?

Here is my code:

MongoClient.connect(Config.database.url).then((db) => {
        console.log('Connected to MongoDB');
        databaseInstance = db;
       // start web server
    })

mikemaccana · Accepted Answer · 2021-01-11 12:51:27Z

14

To define the timeout for the initial connection use serverSelectionTimeoutMS.
To define the timeout for the ongoing connection connectTimeoutMS

MongoDB 3.6 connection example:

const client = new MongoClient(Config.database.url, {
  connectTimeoutMS: 5000,
  serverSelectionTimeoutMS: 5000
})

client.connect(err => {
  console.log('Connected to MongoDB')
  // ..
})

See the official docs for serverSelectionTimeoutMS

edited Jan 11, 2021 at 12:51

mikemaccana

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answered Jun 15, 2020 at 22:14

Ricky Boyce

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2 Comments

mikemaccana Over a year ago

Thanks - this is exactly what I (and I suspect OP, despite marking the other answer as correct) was looking for. connectTimeoutMS wasn't timing out the initial connection. serverSelectionTimeoutMS is exactly what we want.

js-kyle Over a year ago

serverSelectionTimeoutMS specifies how long (in milliseconds) to block for server selection before throwing an exception - it is not just for the initial connection as implied in this answer

tanaydin · Accepted Answer · 2016-10-11 14:48:05Z

4

you can use "connectTimeoutMS" like so

MongoClient.connect(Config.database.url, {
    server: {
        socketOptions: {
            connectTimeoutMS: 5000
        }
    }
}).then((db) => {
    console.log('Connected to MongoDB');
    databaseInstance = db;
   // start web server
})

Here is more information about it...

http://mongodb.github.io/node-mongodb-native/2.0/reference/connecting/connection-settings/ https://mongodb.github.io/node-mongodb-native/driver-articles/mongoclient.html

answered Oct 11, 2016 at 14:48

tanaydin

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1 Comment

mikemaccana Over a year ago

I don't actually think this is what the OP wants (despite them marking it as accepted). connectTimeoutMS isn't what most people would consider the connection timeout. See @Ricky's answer below.

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