How to connect web3 to ethereum node using flutter?

[simolus3]

How to connect web3 to ethereum node using flutter?

[simolus3]

Hi, perhaps the docs are a bit unclear here.
web3dart doesn't implement a full Ethereum node itself (it doesn't do mining etc.). Instead, it connects to a third-party Ethereum node to fetch data and to distribute transactions.

It thus needs a URL of a server that implements the RPC API. You can either host a node yourself (for instance by using --rpc with geth), or use a public service like infura which web3dart can connect to. If you passed localhost, it would try to connect to an Ethereum node running on the same device your flutter app is running on.

If you're getting started, I recommend using a public service like infura so you don't have the hassle of setting everything up yourself. When logging in there and creating a project, it will give you a url that looks like this: https://mainnet.infura.io/v3/YOUR-PROJECT-ID. When you pass that url to web3dart, it should work. Feel free to re-open if that doesn't work or you have further problems.

[simolus3]

I've just put together this working example: https://gist.github.com/simolus3/b28756ff133f5424b8e9a85ebc16ea2e
I think your problem might be a permission error, see dart-lang/http#185 (comment) for a possible solution. Does that fix your problem?

[ishwarchandratiwari]

i have tried with infura node i am getting same error

[ishwarchandratiwari]

@simolus3 Main problem is doc which is not clear , help me writing web3 connection code in flutter , i think i am doing some mistake in writing web3 connection code

[ishwarchandratiwari]

Thanks @simolus3