Understanding Ethereum Web3.js and Hex data
As a developer using Web3.Js, there are probably problems with recovering hex data from transactions. In this article, we are immersed in the concept of the web3.js “TX” object and hex data and explores how to overcome common problems.
What is web3.js?
Web3.js is a JavaScript directory to interact with Ethereum blockchain. This provides a series of APIs and utilities to build decentralized applications (DAPPS) on the Ethereum network. When working with transactions, web3.js uses the “TX” object, which represents a transaction sent to the blockchain.
Hex data in web3.js transactions
Hex data is used to represent raw transaction data stored on the blockchain. It is a series of hexadecimal characters that contain information about the transaction, such as its hash, useful burden and other details. In Web3.js, this hexadat is embedded in the tx object.
The tx object and the hex data
When you create a new transaction using Web3.Js, the “TX” object is initialized with several properties:
From: the address of the sender
to: The address of the recipient
Chainid: Ethereum Blockchain Network ID (for you 44445)
value: the amount to be transferred
However, when you print or log the hex data related to the transaction by methods such as Console.Log (tx.rawtransection.hex), it appears as a string of hexadecimal characters. But if we dig deeper, we can see that this is actually the raw hex data that represent the transaction itself.
The problem: Hidden hex data
Suppose you are now trying to get specific information from hex data by methods such asjson.parde ()orhex2abiaddr (). If you do this, you can face problems, because these features cannot directly analyze the embedded hex data within thetxobject.
Why does this happen?
Hex data seems hidden that web3.js uses a particular coding system to store transaction data on the blockchain. This coding system includes embedded hex data as part of the useful burden of the transaction, not as a separate byte.
In other words, whentx.rawtransection.hexprints or logged it, it actually prints raw hex data from the Ethereum network that is stored by a useful load on the transaction. However, the program is not direct access to this useful burden, so it appears as a hidden string of hexadecimal characters.
Solve the problem
You can use some solutions to overcome the problem:
1.
- Extension of hex data with Web3.js with built -in methods : You can use the built -in methods of web3.js, such astx.rawtransection.hex ()
from the useful burden of the transaction.
- Use another coding scheme : If you make an individual application, you may need to enable your own coding scheme to store and transmit transaction data.
Example Code
Here's an example of a code detail that shows how to use web3.js built -in methods to extract hex data:
` Javascript
Const web3 = needed (‘web3’);
// Create a new web3 instance
Const web3 = new web3 ();
// Get the Current Ethereum Service Provider instance
Const Service Provider = Waiting for Web3.eth.getProvider ();
CONST TX = {
Sender: ‘0x1234567890abcdef’,
To: ‘0x9876543210fedc’,
Chainid: 44445,
Value: ‘1.2 ether’
};
// Expanding hex data with web3.js built -in methods
Const Rawtransection = Waiting for service provider.eth.sendrawtransection (TX);
Const Txhex = Waiting for Web3.eth.Ebitohex (rawtransection.rawtransection);
console.log (txhex); // prints the extracted hex data
// You can use it as an alternative solution:
Const txdata = rawtransection.rawtransection;
Const hex = web3.utils.