var web3 =  new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));

throws an error:

Invalid JSON RPC response: ""

while address is some existing valid address.

geth is running.

What could possibly cause that?

  • What is your geth command line? Is rpc interface enabled? It should be something like geth --rpc <other options>.
    – Ismael
    Commented Nov 28, 2017 at 20:57
  • @Ismael no just geth. Is that the problem? Are you sure? Because I do manage to create accounts via web3, but not to get their balances. This code does work: web3.eth.accounts.create();
    – Alon
    Commented Nov 28, 2017 at 21:35
  • Did you try to launch geth with said command line option?
    – Ismael
    Commented Nov 29, 2017 at 4:52
  • @Ismael yes I did and I don't get this error anymore, thank you. You can write it as an answer and I will accept it.
    – Alon
    Commented Dec 2, 2017 at 19:37


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