Metamask: Metamask SDK window is not defined on nextjs

Here is a step -by -step guide and an example of code to help you resolve the error “Metamask: Metamask SDK is not defined” error in Next.js:

What is the problem?

The Metamask SDK requires access to the browser window object, which is only available in the context of the browser. However, your Next.JS application is built on the side of the server and does not have direct access to the browser window.

Solution 1: Use a rendering method on the server side (SSR)

Instead of using the “Window” object directly, you can use an SSR method to recover the necessary data from SDK Metamask. Here is an example:

`Jsx

Import {metamasksdk} of '@ metamask / sdk';

Constmetmaskwindow = async () => {

Const Window = wait for a new promise ((resolution) => globalthis.settimeout (resolve, 1000));

Return window;

};

Export the default function app () {

Const Metamaskwindow = Wait Getmetamaskwind ();

// Use the Metamask SDK in the React component

}

'

In this example, we use a promise to wait at least 1 second before returning the object "Window". We then use this object to access the "Window" property.

Solution 2: Use an internationalization library (for example, i18n.js)

Another option is to use an internationalization library such asi18n.js, which provides a way to convert between the browser window and the server side data. You can installi18n.jsvia npm or yarn:

bash

I18N-JS NPM installation

'

Then, in your component, you can use the hookUsei18ni18n-JS" to access the necessary data:

Jsx

Import {usei18n} of 'i18next';

Constmetmaskwindow = async () => {

Const i18n = usei18n ();

Return window;

};

'

Solution 3: Use a WRAPPER component

Another approach is to create a WRAPPER component that uses the SDK Metamask and manages the data recovering the customer side. In this way, you can make sure that the necessary data is available even if Next.js does not make the component:

Jsx

Import {metamasksdk} of '@ metamask / sdk';

Const Metamaskwrapper = ({data}) => {

Return {data}

;

};

Export the default function app () {

Const Data = Wait Getmetamaskwindow ();

back (

));

}

'

In this example, we use a separate componentMetamaskwrapper ‘which uses the SDK Metamask to recover the necessary data. In this way, even if Next.js does not make the component, the data will always be available.

Choose the solution that best suits your use case

Each of these solutions has its own advantages and disadvantages. Consider the following factors when you decide which approach suits you best:

  • Do you need to directly access the browser window object? (Solution 1)

  • Do you need support for internationalization? (Solution 2)

  • Do you prefer a customer side solution or a solution based on the server side rendering? (Solution 3)

By choosing the right solution, you should be able to resolve the error “Metamask: Metamask SDK is not defined” in your Next.js application.

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