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METAMASK -Account Change Problem: To review the code

As a developer, he probably had problems with modifying the Metamask account. The problem lies in a particular code line in the App.js file in the Ethers.js file. In this article, we get into the wrong thing and give advice to solve it.

The problem: 3 rows of code

`Javascript

Const Realestate = New Ethers.Contract (Config [Networktype]]);

'

The problem:

The problem refers to the line where the "network" is referred to. More specifically, it seems to be 25-27. Lines cause problems:

Javascript

CONST NETWORK = CONFIG [Network];

CONST NETWORKTYPE = CONFIG [Network] .Network;

// or

Constate Realestate = New Ethers.Contract (Config [Network]);

'

In this code extract, it seems that configt is an embedded object. When trying to access the 'config' network field, it starts an Ethers.js error because it is not sure which network type corresponds to the current network type.

The solution:

To solve the problem, you need to make sure that the correct "network" is used to build the Metamask contract. You can do this by adding additional logic or using environmental variables to determine the type of network.

Here are some possible solutions:

1.

Javascript

Const Config = {

Development: {

Network: "Rinkeby",

Networktype: "MainNet"

},

Test: {

Network: "Ropsten",

Networktype: "Testnet"

}

};

// or

Config.networktypes = {{

Development: ['MainNet', 'Testnet'],

Test: ['Ropsten']

};

'

Then use the appropriate network type when constructing the Metamask contract:

Javascript

Const Realestate = New Ethers.Contract (Config.Networktypes [Config.network]);

'

• Use environmental variables :

You can store network types and their appropriate contracts in environmental variables. Then load these variables into the code using theprocess. Here’s an example:

`Javascript

Const {Networktype} = Process.ev;

Const Config = {

// ...

};

// or

config.networktypes = process.env.network_types || {};

'

In this case, you can use the following code series:

Javascript

Constate Realestate = New Ethers.Contract (Config [Networktype]);

'

• Use a configuration file :

You can store network types and their appropriate contracts in a separate configuration file (for example, "Metamask-Configuration.json"). Then load this file to the code usingconfig.fromjson ().

In this case:

Javascript

Const config = needed ('./ metamask-configuration.json');

// or

config.networktypes = config.networktypes || {};

` ‘

Conclusion:

The problem of the 3 codes line is probably due to a poorly configured network type. With additional logic, using environmental variables, or loading the configuration file, you must be able to solve this problem and successfully change your Metamask account.

Don’t forget to refer to the Ethers.js documentation if you want more information to work with contracts, networks, and configurations.