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Understand the connection of the data type of the Metamask sign
As passionate about digital active ingredients, you probably know Metamask, the popular portfolio application that allows transparent interactions between your Ethereum accounts and your decentralized applications (DAPP). One of Metamask’s exciting features is his ability to manage the signedtypedata connection using web3.js. However, I would like to take advantage of this opportunity to dive more deeply into a common problem that can occur when implementing the connection of Metamask Tapée data: the undefined “buffer” error.
The problem
When you try to check SignedTypedata with Metamask, he expects a buffer object as a starter. Indeed, the function eth.util.signtypedata () returns an Ethereum transaction chopping in the format of a hexadecimal chain (for example, “0x …”).
However, when you work with typical data or other types that do not comply with the buffer interface, such as Signedtypedata, Metamask launches an error. More specifically, it increases a “reference” because the stamp is not defined.
The solution
To solve this problem, you will need to make sure that your typed data complies with the buffer interface. Here are some approaches:
- Define the type of your typed data
: If possible, define the exact type of your signedtypedata in the object
Buffer. You can use Typescript or the integrated types of JavaScript to specify it.
`Typescript
Import * as web3 from "web3";
constant typedata = {
// Your typed data here,
Type: Buffer.from ("Your Type-Here"),
Value: "your value-hera",
};
Const transactionhash = web3.eth.util.signtypedata (Typeddata);
'
- Use a polyfill : If you work with older browsers or NODE.JS versions without support for typedarrays, plan to use a polyfill as "Typedarray-Buffer" or "Typedarray-Polyfill". These libraries provide an emergency implementation of the buffer interface.
Javascript
Const {buffer} = require ('buffer');
constant typedata = {
Type: "Tampon",
Value: Buffer.from ("Your Type-Here"),
};
Const transactionhash = web3.eth.util.signtypedata (Typeddata);
` ‘
Conclusion
The implementation of the connection of Metamask typed data requires care when working with typed data. By following the advice described above, you should be able to resolve the “buffer” error not defined and successfully check SignedTypedata with your application.
Do not forget to always check the official documentation for each library or API that you use, because their behavior can change over time. Happy coding!