Metamask: View: Root Error: Invalid character in NaN / View: Root TypeError: undefined is not an object (evaluating ‘o.negative’)

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Title: Metamask Integration Issue: Root Error and TypeError

Introduction

As a React developer, you’ve probably encountered issues when integrating the MetaMask wallet into your web application. In this article, we’ll explore two specific errors that can occur when using MetaMask: “View: Root Error: Invalid character in NaN” and “Root TypeError: undefined is not an object (evaluating ‘o.negative’)”. We’ll analyze each error and provide guidance on how to fix it.

Error 1: View: Root Error: Invalid character in NaN

The first error we’ll address is related to the MetaMask wallet’s Web3 API. When using MetaMask, you typically pass a Token object as an argument to the “getAccount” method. However, if the Token object contains invalid characters (e.g. non-ASCII or Unicode characters), a value of “NaN” (Not a Number) is returned.

To resolve this issue, ensure that your Token object is properly formatted and does not contain any invalid characters. You can verify this by checking the MetaMask wallet Web3 API documentation for specific token formatting requirements.

Solution

• Check your Token object to ensure it conforms to the expected format.

• If necessary, modify your code to handle invalid character input when creating a new Token object.

Error 2: Root TypeError: undefined is not an object (evaluating “o.negative”)

The second error occurs when attempting to access properties of a non-object value. In this case, “o.negative” is likely the result of calling “getAccount()” with a Token object that contains invalid characters.

To fix this issue, you need to change your code to properly handle the NaN value returned by the MetaMask wallet Web3 API. One way to do this is to check if the account property is an instance of type NaN before attempting to access its properties.

Solution

• Change your code to check for the existence and type of the account property:

const account = await window.ethereum.getAccount();
if (!account || typeof account !== 'object') {
throw new Error('Invalid connection to MetaMask wallet');
}

By adding this check, you can prevent access to properties of a non-object value and fix the TypeError.

Conclusion

In summary, both errors can occur when integrating Metamask into your React web application. By understanding the root causes of these issues and performing appropriate checks for invalid data, you should be able to resolve them and continue to build robust and reliable applications with MetaMask. If you have persistent issues or need further assistance, feel free to contact our support team.

Note: This article is a general guide and specific implementation details may vary depending on your use case and the version of MetaMask you are using. It is always recommended to consult the official MetaMask documentation and developer resources for more information on troubleshooting and fixing errors in your application.