Detection of Ethereum suppliers using MetaMask in JavaScript

When interacting with a web application that requires authentication, especially those built using Ethereum-based platforms such as DApp providers or decentralized finance (DeFi) applications, it is important to ensure seamless integration. One of the most important aspects of this is to detect the Ethereum provider connected to the user’s account.

The detectEthereumProvider library from @metamask/detect-provider provides an easy way to do this. In this article, we’ll look at how you can use MetaMask in your JavaScript application to discover an Ethereum vendor and then connect it to specific chain details.

Configure DetectEthereumProvider

First you need to install the detectEthereumProvider library using npm or yarn:

npm install @metamask/detect-provider

Or with yarn:

yarn add @metamask/detect-provider

Next, import and initialize the provider in your JavaScript code. Here is an example of how it can be done:

import detectEthereumProvider from '@metamask/detect-provider';

const ethereum = await detectEthereumProvider();

In this fragment ethereum is assigned the result of calling the function detectEthereumProvider.

Connecting to a specific chain

To connect an Ethereum provider to a specific chain, you need to specify these chains. This includes the network identifier (for example, 1 for Mainnet, 4 for Ropsten), gas price and other optional parameters. Here is an example of how to do it:

const chainId = ethereum.chainId;

console.log(Chain ID: ${chainId});

if (chainId === 1) {

// Mainnet settings

} else if (chainId === 4) {

// Ropsten network settings

}

In this example, we check the chainId property to determine which chain settings to apply. If necessary, you can add more conditions.

Advanced Options

Metamask: MetaMask detectEthereumProvider Check is connected to specific chain

The detectEthereumProvider function returns an object with several properties that can be used to configure interaction with Ethereum:

  • chainId: chain identifier.
  • networkName: network name (eg «Eth», «ERC20»).
  • gasPrice: gas price in Wei (1 Wei = 1/10^15 Ether).
  • maxBlockNumber: maximum number of blocks to retrieve.
  • accounts: an array of Ethereum accounts, where each account is an object with properties such as address, name.

You can access these properties using the ethereum object returned by detectEthereumProvider. For example:

const gasPrice = ethereum.gasPrice;

console.log(Gas price: ${gasPrice});

const accounts = ethereum.accounts;

console.log("Accounts:");

accounts.forEach((account) => console.log(account));

Usage Example

Here’s an updated version of your code that includes the basic login system:

import detectEthereumProvider from '@metamask/detect-provider';

const ethereum = await detectEthereumProvider();

async function login() {

// Your login logic is here...

}

login();

When running this code, the user will be prompted to enter the details of their Ethereum provider. After the user enters the correct credentials, it will connect the ethereum object and display a successful login message.

By following these steps, you can effectively integrate MetaMask into your JavaScript application to discover specific Ethereum vendors and connect them to various chain settings.

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