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Metamask: Ether.js works fine on desktop, but not with Metamask mobile app
As a Dapp developer, I have encountered several issues while using the popular Metamask extension to interact with my Ethereum smart contract. In this article, I will share my experience to get Metamask working properly on both desktop and mobile devices.
The problem:
My problem started when I decided to use MetaMask on Android and iOS devices to connect to my Dapp’s mainnet connection via the Ether.js library. At first, everything worked fine, but as soon as I installed the Metamask app on my Android or iOS device, I encountered an error.
The Error:
The error message usually reads something like this:
TypeError: Cannot read property 'default' of undefined
or a similar variation depending on how MetaMask is configured in your Dapp’s mainnet connection. This issue seems to occur even when the Ether.js library is working properly on my desktop.
The Solution:
After some trial and error, I discovered that this issue occurs because of how Metamask handles the “default” property of the Web3 Provider object returned by Ether.js.
To resolve this issue, I came up with two potential solutions:
- Use a different provider:
One solution is to switch from using Ether.js directly with MetaMask to using a different provider like Truffle.js or Hardhat. These libraries offer more control over the Web3 Provider and may be less prone to errors related to the “default” property.
- Set the “defaultProvider” option on Ether.js: Another solution is to set the “defaultProvider” option on the Ether.js library itself, which can override any errors that occur due to the “default” property.
To enable these solutions, you will need to modify your Dapp’s mainnet connection code using one of the following methods:
Solution 1: Use a different provider (Truffle.js or Hardhat)
const Web3 = require('web3');
const ethers = require('ethers');
const supplier = new ethers.providers.Web3Provider();
supplier.setBlockchian('mainnet'); // Set the mainnet provider
const contract = new ethers.Contract(contractAddress, abi);
Solution 2: Set defaultProvider to Ether.js
const Web3 = require('web3');
const ethers = require('ethers');
const supplier = new ethers.providers.Web3Provider();
supplier.setBlockchian('mainnet', {
defaultProvider: '
});
Conclusion:
While the Metamask app can still connect to my Dapp’s mainnet connection via Ether.js, I found two potential solutions that solve this problem. These solutions require you to modify your Dapp’s code using one of the methods above.
By implementing these solutions, you should be able to get MetaMask to work properly on both desktop and mobile devices when connecting to your Ethereum smart contracts using Ether.js.
Note: These are temporary workarounds only and may not be the most effective solution. I recommend exploring other options to resolve this issue or consulting a professional developer if necessary.
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