ethers.js: could not detect network (event="noNetwork", code=NETWORK_ERROR, version=providers/5.0.5) in React Native Expo

Here is my code being used for testing. It works in a small node program but will not work in React Native.

import "@ethersproject/shims";
import { ethers } from "ethers";

const NodeAddress = "http://34.87.222.10:8545";
// ....
  useEffect(() => {
    (async () => {
      try {
        let p = await ethers.providers.getDefaultProvider(NodeAddress);
        await p._networkPromise;
        console.log(p);
      } catch (e) {
        console.log(e);
      }
    })();
  }, []);

// ....

About this issue

Original URL
State: closed
Created 3 years ago
Comments: 22 (7 by maintainers)

Most upvoted comments

Strangely,react native does not work with the current version of ethers library but it works fine with ethers version 5.0.5 and lower

nikita-zot-1408 on Mar 2, 2021

I think there may be. Depending on your setup (again, if you are using a proxy, things might further be affected), but you might want to adjust the network device to be any (I think you do this by specifying 0.0.0.0) and you might need to add the CORS origin flag to allow any (I don’t know the key or value to set for this).

If it is using CORS, make sure your Proxy is set up to forward OPTIONS too.

Setting up a link is definitely non-trivial…

ricmoo on Feb 26, 2021

@ricmoo Thanks for the assistance. The issue is the non-https blocking like you mentioned.

conorbros on Feb 25, 2021

You don’t need to await on getDefaultProvider, and can you try using await provider.ready instead and see if that helps?

Is the NodeAddress reachable from the phone/computer you are using? Keep in mind that iOS blocks non-https (i.e. http) traffic for example. Android may do something similar…

You can try hitting the host directly to test the link.

ricmoo on Feb 25, 2021