How to Check if a Given String is a Valid Ethereum Wallet Address?

A Valid Ethereum Wallet Address Starts with “0x” and is 42 characters long. To check if a given string is a valid Ethereum address, you would typically:

• Check if it’s 42 characters long (including the 0x prefix).
• Ensure it consists only of hexadecimal characters.
• Optionally, verify the checksum if it’s in mixed-case EIP-55 format.

Here’s how you can check for the validity of an Ethereum address using web3.js:

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const Web3 = require('web3');
const web3 = new Web3();
 
const isValidEthereumAddress = (address) => {
    return web3.utils.isAddress(address);
};
 
// Example
const address = '0x...';  // Replace with your address
console.log(isValidEthereumAddress(address) ? 'Valid' : 'Invalid');

const Web3 = require('web3');
const web3 = new Web3();

const isValidEthereumAddress = (address) => {
    return web3.utils.isAddress(address);
};

// Example
const address = '0x...';  // Replace with your address
console.log(isValidEthereumAddress(address) ? 'Valid' : 'Invalid');

The web3.utils.isAddress() function checks the basic structure (i.e., length and hexadecimal format) of the address. If an address is mixed-case, it will also check its checksum based on EIP-55.

Note that just because an address is valid in format doesn’t mean it’s been used on the Ethereum network or that it has a corresponding private key. It simply means that it fits the expected structure of an Ethereum address.

Ethereum Blockchain

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• How to Check the Balance of a Ethereum Wallet Address?
• How to Check if a Given String is a Valid Ethereum Wallet Address?
• How to Get the Gas Price and Gas Fee on Ethereum Blockchain?
• How to Get the Latest Block Number (Head Block) on Ethereum Blockchain?
• Today.. Gas Fee was High
• Gas Fee is Fixed Regardless the Amount of ETH to Send
• The Simple Way to Watch the Transactions of an ETH Account
• Watch Gas Price Before You Send Steem to Swap ETH

–EOF (The Ultimate Computing & Technology Blog) —