Metamask: I am not able to change my Metamask account due to 3 lines of code in the below App.js code from line 25-27

Metamask Account Change Issue: A Look into the Code

As a developer, you’ve likely encountered issues with changing your MetaMask account. The problem lies in a specific line of code within an App.js file on Ethers.js. In this article, we’ll dive into what’s going wrong and provide guidance on how to resolve it.

The Issue: 3 Lines of Code

const realEstate = new ethers.Contract(config[network[networkType]]));

The Problem:

The issue is with the line where network is being referenced. Specifically, lines 25-27 seem to be causing trouble:

const network = config[network];

const networkType = config[network].network;


// or

const realEstate = new ethers.Contract(config[network]);

In this code snippet, config appears to be an object with a nested structure. When trying to access the network field of config, Ethers.js throws an error because it’s not sure which networkType corresponds to the current network type.

The Solution:

To resolve this issue, you need to make sure that the correct networkType is used to construct a MetaMask contract. You can do this by adding additional logic or using environment variables to determine the network type.

Here are some possible solutions:

• Use an Object with Multiple Network Types:

const config = {

  development: {

    network: 'rinkeby',

    networkType: 'mainnet'

  },

  test: {

    network: 'ropsten',

    networkType: 'testnet'

  }

};


// or


config.networkTypes = {

  development: ['mainnet', 'testnet'],

  test: ['ropsten']

};

Then, use the correct network type when constructing the MetaMask contract:

const realEstate = new ethers.Contract(config.networkTypes[config.network]);

• Use Environment Variables:

You can store the network types and their corresponding contracts in environment variables. Then, load these variables into your code using process.env. Here’s an example:

const { networkType } = process.env;

const config = {

  // ...

};

// or


config.networkTypes = process.env.NETWORK_TYPES || {};

In this case, you can use the following line of code:

const realEstate = new ethers.Contract(config[networkType]);

• Use a Config File

  

  :

You can store your network types and their corresponding contracts in a separate config file (e.g., metamask-configuration.json). Then, load this file into your code using config.fromJSON().

In this case:

const config = require('./metamask-configuration.json');

// or


config.networkTypes = config.networkTypes || {};

Conclusion:

The issue with the 3 lines of code is likely due to a misconfigured network type. By adding additional logic, using environment variables, or loading your config file, you should be able to resolve this issue and successfully change your MetaMask account.

Remember to always refer to Ethers.js documentation for more information on how to work with contracts, networks, and configurations.

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