I'm trying to get the network ID from the Web3 object on the client side (i.e. - while running Javascript code in the browser). I have code that confirms that the object exists and it does. I have the Metamask extension installed and configured in Chrome. I have clicked on the extension and I am definitely connected to the Ganache network client (Localhost 8545). However, every time I call **web3.version.getNetwork()** the result is **undefined**. Does anyone know why this is happening and how I can fix it?

UPDATE: I tried the same test with web3.eth.getAccounts() and that too is coming back undefined. I'm guessing I'll get the same result with any of the Web3 methods/properties I try.

    // Make sure the Web3.js object has been defined.

    if (typeof gameDetailsObj == 'undefined' || gameDetailsObj == null)
        throw new Error(errPrefix + 'The game details object is unassigned.');

    if (typeof currentUserObj == 'undefined' || currentUserObj == null)
        throw new Error(errPrefix + 'The current user object is unassigned.');

    // >>>>> getNetworkCall is ALWAYS 'undefined'.          
    var getNetworkCall = web3.version.getNetwork();

1 Answer 1


Yes, your right it will return undefined. Because web3.version.getNetwork() is not a sync method and it will not return any value. In javascript, If function is not return any method it will init varible is undefined. Refer below code for ref:

web3.version.getNetwork(function(err, networkId){
                case "1":
                    //TODO your logic...
                    //If neteork id is not mattching...

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