This content originally appeared on DEV Community and was authored by Avneesh Agarwal
If you haven't been living under a rock you have probably heard of Web 3.0!
One of the most important parts of a full-stack is authentication. So let's see how to authorize users with their Metamask wallet in a Next.js app.
If you don't know what is metamask then check out their website
Setting up the app
Create a new next app
npx create-next-app next-metamask
Navigate into the app
cd next-metamask
Installing the required dependencies
npm i @walletconnect/web3-provider moralis react-moralis # npm
yarn add @walletconnect/web3-provider moralis react-moralis # yarn
Start the server
npm run dev # npm
yarn dev # yarn
Get Moralis Credentials
Go to moralis and signup/login. After that click on Create new Server and select TestNet Server
By selecting it you will see a popup. Fill in the details, and click the Add Instance button.
After the server is created click on view details
We are going to need the server URL and Application ID
Building out the authentication system
Adding the environment variables
Create a .env.local file in the root of your folder and add the env variables like this-
NEXT_PUBLIC_MORALIS_APP_ID=<app_id>
NEXT_PUBLIC_MORALIS_SERVER_ID=<server_id>
You need to replace the values of the variables with the credentials you got from Moralis.
Wrap the app in a MoralisProvider
Go to _app.js and wrap the <Component {...pageProps} /> with the Moralis Provider with the env variables like this-
<MoralisProvider
appId={process.env.NEXT_PUBLIC_MORALIS_APP_ID}
serverUrl={process.env.NEXT_PUBLIC_MORALIS_SERVER_ID}
>
<Component {...pageProps} />
</MoralisProvider>
Now import MoralisProvider from react-moralis
import { MoralisProvider } from "react-moralis";
Creating the sign-in button
I am going to do create the login button on the home page, feel free to create it on any page you need.
Get the authenticate function from the useMoralis hook-
const { authenticate } = useMoralis();
You also need to import the hook from react-moralis
import { useMoralis } from "react-moralis";
Create a button like this-
<button
onClick={() => {
authenticate({ provider: "metamask" });
}}
>
Sign in with MetaMask
</button>
Now if we click on sign in, it will open the metamask extension for sign in.
%[https://www.loom.com/share/c2b1c9936ad44185810d9978ea5c2193]
Show signout button if the user is signed out
We need to get a few more things from the useMoralis hook like this-
const { authenticate, isAuthenticated, logout } = useMoralis();
Create a ternary operator to show the logout button, if the user is signed in otherwise show the sign-in button-
{isAuthenticated ? (
<button
onClick={logout}
>
Logout
</button>
) : (
<button
onClick={() => {
authenticate({ provider: "metamask" });
}}
>
Sign in with MetaMask
</button>
);
}
Now our sign in and sign out is working 🥳🥳
Getting the user data
Let's see how to get some basic data like their eth address and username.
When the user is authenticated, you can add this fragment to show the userName and their address wallet-
<>
<button onClick={logout}>Logout</button>
<h2>Welcome {user.get("username")}</h2>
<h2>Your wallet address is {user.get("ethAddress")}</h2>
</>
You need to get the user from the useMoralis hook as well-
const { authenticate, isAuthenticated, logout, user } = useMoralis();
The userName is very random 😂but it can help in some cases and the eth address can be used for transactions.
Signing off
It was this easy to implement authentication of metamask with moralis 🤯
Hope you found this tutorial useful and stay tuned for more of these web 3.0 tutorials ✌️
Useful links
This content originally appeared on DEV Community and was authored by Avneesh Agarwal
Avneesh Agarwal | Sciencx (2021-12-03T14:24:57+00:00) Metamask authentication with Moralis in Next.js. Retrieved from https://www.scien.cx/2021/12/03/metamask-authentication-with-moralis-in-next-js/
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