Address Verification with Metamask: Step by Step
As a web developer, you may have encountered the challenge to check the owner’s identity when the user shares with their Ethereum Wallet address on your site. Metamk – a popular browser extension, which safely manages and stores Ethereum accounts. In this article, we will look at how to use Metamk to check that the user has an address from your site.
What is Metamk?
Before diving into a solution, let’s quickly cover what Metamk is doing. This is a safe wallet extension that allows users to import their Ethereum accounts directly to your site or mobile app. When the user imports their account, they can choose whether to share it with you or keep it private.
Step 1: Prepare your site for verification
To verify that the user has an address from Metamask, you will need to create a simple destination on the server that accepts the imported address as input. In this example, let’s assume that your site uses NODE.Js as its back language.
Create a new file named Index.js' and add the following code:
JavaScript
Const Express = ask (‘express’);
Const app = Express ();
App.post (‘/Verify-Address’, (Req, Res) => {
Const Address = Req.Body.address;
// Integrate with Metamk API to check ownership
Import (‘Metamk’). Then ((API) => {
API.verifyaddress (address) .then ((result) => {
IF (result.Everted) {
Res.jon ({message: ‘The user owns this address’});
} else {
Res.jon ({message: ‘The user does not belong to this address’});
}
}). Catch ((error) => {
Console.Error (error);
Res.Status (500) .jon ({error: ‘Failed to check the ownership’});
});
}). Catch ((error) => {
Console.Error (error);
Res.Status (400) .jon ({error: ‘Invalid request data’});
});
});
`
This code imports “Metamask” API and uses it to verify that the imported address belongs to Metamk. If the ownership is checked, we respond with a success message.
Step 2: Integrate Metamass with your site
To integrate Metamas with your site, you will need to add Metamask Library as dependence on your file “Package.json”:
`JSON
{
“Name”: “My-Website”,
“Version”: “1.0.0”,
“Addictions”: {
“@TIPE/METAMK”: “^3.4.7”,
“Express”: “^4.17.1”.
}
}
`
Then create a new file named Metamk.js and add the following code:
`JavaScript
Import {ethers} from “ethers”;
Import * as a metamask from “@Tips/Metamk”;
CONST API = Metamk;
Export default ASYNC function Verifyaddress (address) {
Const account = wait for API.Getaccount (address);
if (account) {
return the truth;
} else {
return false;
}
}
`
This code uses the Metamask API to obtain an Ethereum account object associated with the imported address.
Step 3: Call the Verification Function
![Metamask: How can I securely verify a user owns an address from Metamask? [duplicate]](https://gupgap.com/wp-content/uploads/2025/02/fa5c3855.png)
To check the user ownership, call the Verifyaddress function from your site:
JavaScript
Const address = ‘0x … user-and…’; // Replace the actual address of Metamask
to bring (‘/verify-anaddress’, {
Method: “Post”,
Headers: {‘Content-Type’: ‘Application/JSON’},
Body: JSON.Stringify ({Address}),
})
.Then ((answer) => reaction.json ())
.Then ((result) => Console.log (result))
.catch ((error) => Console.Error (error));
`
Replace ... User Addr ... The actual address of Metamask you imported from your site.
When performing these steps, you can safely check that the user owns the Ethereum’s address using Metamka. This approach ensures that the verification process is encrypted and resistant to counterfeiting, protecting sensitive user data.
