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I have started geth using below:

geth --rpc --rpccorsdomain * --rpcport 8545 --rpcapi personal,web3,eth,net

and this is my web3.js code:

<script src="/bower_components/web3/dist/web3.min.js"></script>
<script type="text/javascript">
    function send() {
        if (typeof web3 !== 'undefined') {
            web3 = new Web3(web3.currentProvider);
        } else {
            web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
        }
        if(!web3.isConnected()) {
            console.log('not-connected');
        } else {
           console.log('connected');
        }
    }
</script>

first console.log said "not-connected" and got an error: Error: CONNECTION ERROR: Couldn't connect to node http://localhost:8545.

  • check if the port is open using netstat cmd – Badr Bellaj Apr 21 '18 at 7:46
  • yes it is opened. tcp 0 0 127.0.0.1:8545 0.0.0.0:* LISTEN 1521/geth – Haren Sarma Apr 21 '18 at 8:08
  • try 127.0.0.1 instead localhost – Badr Bellaj Apr 21 '18 at 8:11
  • did but same error – Haren Sarma Apr 21 '18 at 8:16
  • 1
    install metamask and check if it connect to your nodein localhost mode – Badr Bellaj Apr 21 '18 at 9:05
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Just a small error of scopes. Your web3 variable goes out of scope as soon as it is declared.

<script src="/bower_components/web3/dist/web3.min.js"></script>
<script type="text/javascript">
    var web3;
    function send() {
        if (typeof web3 !== 'undefined') {
            web3 = new Web3(web3.currentProvider);
        } else {
            web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
        }
        if(!web3.isConnected()) {
            console.log('not-connected');
        } else {
           console.log('connected');
        }
    }
</script>

Note that I have declared var web3 explicitly outside the function

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