How to know that I am in mainnet or not?

Question

I use Metamask. Until now I used the goerli testnet network for my development project. I use ethers.js also in my project. Now how can I implement a test for knowing the network if it is goerli or the main network Ethereum ? Here is my code, but I dont see any clue for my needs :

const { ethers } = require("ethers");

async function main() {
  const provider = new ethers.providers.InfuraProvider();
  let ntwrk = await provider.getNetwork();
  console.log("============= selected network =", ntwrk);
}

main();

At runtime the console log shows :

{
  name: 'homestead',
  chainId: 1,
  ensAddress: '0x....',
  _defaultProvider: [Function: func] { renetwork: [Function (anonymous)] }
}

When I change the network then the name is always 'homestead', and the chainId is always 1

edit :

full code

const { ethers } = require("ethers");

async function main() {
  // Configuring the connection to an Ethereum node
  const provider = new ethers.providers.InfuraProvider(
    
  );
  let ntwrk = await provider.getNetwork();
  console.log("============= selected network =", ntwrk);
}

main();

Answer 1

In the code you provided, the InfuraProvider is created without any network specified, so it connects to the mainnet by default.

The line

let ntwrk = await provider.getNetwork();

If you wanted to connect to a different Ethereum network, such as the Goerli testnet, you would need to specify the network when creating the InfuraProvider

const { ethers } = require("ethers");

async function main() {
  const provider = new ethers.providers.InfuraProvider(
    "goerli", // Specify the Goerli testnet
    "your-infura-project-id" // Replace with your Infura project ID
  );

  let ntwrk = await provider.getNetwork();
  console.log("============= selected network =", ntwrk);
}

main();

It should work for you now. Just make sure to get your project ID from infura