Metamask: When importing Metamask SDK, fix `crypto` module error

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Metamask import error in React Native project

Are you using the official React Native integration for MetaMask, the popular cryptocurrency wallet? Unfortunately, this can sometimes lead to frustrating errors when importing the MetaMaskSDK module. In this article, we will show you what is happening and how to fix it.

The problem:

When you create a new React Native project with npx react-native init, you are installing the MetaMask SDK using npm install meta-mask-sdk. However, this installation may not include the necessary dependencies for Metamask. Specifically, the error occurs when trying to import the crypto module from meta-mask-sdk.

Error Message:

The error message is pretty straightforward:

Error: Importing metamask-sdk resolved module 'crypto' error

This indicates that there is a conflict between the MetaMask SDK and your project’s dependencies, specifically the crypto module.

Why this happens:

When you installed the MetaMask SDK using npm install, it likely included the crypto dependency. However, when you import meta-mask-sdk, React Native is unable to find the required crypto module, resulting in this error message.

Resolving the error:

To resolve this issue, try the following steps:

• Check your project’s dependencies: Make sure that you haven’t accidentally removed or disabled any dependencies required for MetaMask.

• Update your project’s package.json: Make sure the crypto module is included in your project’s dependencies. If not, add it using the following syntax:

"dependencies": {
"crypto": "^4.0.0"
}

• Use a different method to import MetaMaskSDK:

  Instead of importing directly from meta-mask-sdk, try using a more explicit approach by creating your own instance of MetaMaskSDK and configuring it to use the crypto module. You can find an example implementation in the official React Native documentation: [Importing the MetaMask SDK](

Code Example:

Here is a simple code snippet that demonstrates how to create your own MetaMaskSDK instance and configure it to use the crypto module:

import { MetaMaskSDK } from '@meta-mask/sdk';
const metaMask = new MetaMaskSDK({
enabled: true,
options: {
accounts: {
// specify your Ethereum account or network here
accounts: [
'0x...your_account_address...'
]
},
chainId: 3, // Ethereum Mainnet
},
providers: ['metamask']
});

By following these steps and adjusting your imports accordingly, you should be able to resolve the crypto module error when using the MetaMask SDK in your React Native project.

I hope this article helps! Please let me know if you have any further questions or concerns.