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how can i check if an ethereum address is valid or not

Ivan Londono answered on May 5, 2022 Popularity 3/10 Helpfulness 8/10

answer how can i check if an ethereum address is valid or not

related how to check ethereum address is valid

how can i check if an ethereum address is valid or not

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/*Libraries like 
web3.js (https://web3js.readthedocs.io/en/v1.8.1/) 
and ethers (https://docs.ethers.io/v5/) 
have isAddress().
Examples:
*/
ethers.utils.isAddress('0x8ba1f109551bd432803012645ac136ddd64dba72'); // true
web3.utils.isAddress('blah'); // false

Popularity 3/10 Helpfulness 8/10 Language javascript

Source: Grepper

Tags: ethereum javascript

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Contributed on Dec 06 2022

Ivan Londono

0 Answers Avg Quality 2/10

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how to check ethereum address is valid

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/**
 * Checks if the given string is an address
 *
 * @method isAddress
 * @param {String} address the given HEX adress
 * @return {Boolean}
*/
var isAddress = function (address) {
    if (!/^(0x)?[0-9a-f]{40}$/i.test(address)) {
        // check if it has the basic requirements of an address
        return false;
    } else if (/^(0x)?[0-9a-f]{40}$/.test(address) || /^(0x)?[0-9A-F]{40}$/.test(address)) {
        // If it's all small caps or all all caps, return true
        return true;
    } else {
        // Otherwise check each case
        return isChecksumAddress(address);
    }
};

/**
 * Checks if the given string is a checksummed address
 *
 * @method isChecksumAddress
 * @param {String} address the given HEX adress
 * @return {Boolean}
*/
var isChecksumAddress = function (address) {
    // Check each case
    address = address.replace('0x','');
    var addressHash = sha3(address.toLowerCase());
    for (var i = 0; i < 40; i++ ) {
        // the nth letter should be uppercase if the nth digit of casemap is 1
        if ((parseInt(addressHash[i], 16) > 7 && address[i].toUpperCase() !== address[i]) || (parseInt(addressHash[i], 16) <= 7 && address[i].toLowerCase() !== address[i])) {
            return false;
        }
    }
    return true;
};

Popularity 7/10 Helpfulness 6/10 Language whatever

Source: ethereum.stackexchange.com

Tags: whatever ethereum ethereu

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Contributed on May 05 2022

lucky shark

0 Answers Avg Quality 2/10

how can i check if an ethereum address is valid or not

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