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Metamask: ReferenceError: Buffer is not defined
Understanding Signs -Signature of Metamask Sign
As a digital real estate fan, you are likely to know the popular Metamask application, a popular wallet application that allows you to have trouble -free interactions between Ethereum accounts and decentralized applications (Dapps). One of the exciting Metamask services is to be able to handle the SigningData signal on Web3.js. However, I would like to seize this opportunity to deepen more into a common problem that may arise during the logging of metamask data: “buffer” is not a defined error.
problem
When you try to check Signnypeddata using Metamascus, you are expected to enter the cache. The reason for this is that the Etil.signtypedata () The function returns the hash transaction Ethereum in the hexadecimal chain format (eg “0x …”).
However, if you work with written data or other types that do not meet the cache surface, such as SignedTypeddata, Metamask corresponds to an error. Specifically, this increases the “reference error” as the cache is not defined.
Solution
To solve the problem, you need to make sure that your data is in line with the cache interface. Here are many approaches:
- You can use the types of javascript to determine the assignment.
`Betyript
Import * as web3 from 'Web3';
Const Tyeedata = {
// the data provided here,
Type: buffer.from ('Type-Shere'),
Value: “Your value-
};
Const transactionhash = web3.eth.util.signtypeddata (Typeddata);
- Use Polyfill
: If Node.js works with older browsers or versions, without supporting Typeedarrays, note the use of polyfill, such as the use of “Typeedarray Buffer” or “Typeedarray-Polyfill”. These libraries ensure the implementation of the cache order.
`Javascript
Const {buffer} = need ('buffer');
Const Typeddata = {
Type: “Buffer”,
Value: buffer.from ('Your-Type-Shere'),
};
Const transactionhash = web3.eth.util.signtypeddata (Typeeddata);
Conclusion
When working with the data provided, it is necessary to implement the logging of the Metamask brand. According to the above tips, you should be able to solve the defined error defined “buffer” and successfully check Signnypeddata.
Check to check the official documentation of the libraries or APIs you use as their behavior may change over time. Happy coding!