Wallet generation solidity

[covelitein]

How can I generate wallet addresses in my application as users register in my application and assign them those addresses so that they can receive ethers or send ethers.

[AlanHeidel]

import { ethers } from "ethers";

function createUserWallet() {
const wallet = ethers.Wallet.createRandom();
return {
address: wallet.address,
privateKey: wallet.privateKey,
mnemonic: wallet.mnemonic?.phrase
};
}

[RensithUdara]

Server-Side with Node.js (ethers.js)

const { ethers } = require('ethers');

// Generate wallet for new user
async function generateWalletForUser(userId) {
  // Create random wallet
  const wallet = ethers.Wallet.createRandom();
  
  // Store in your database
  await saveUserWallet({
    userId: userId,
    address: wallet.address,
    // IMPORTANT: Encrypt private key before storing
    encryptedPrivateKey: encrypt(wallet.privateKey),
    mnemonic: encrypt(wallet.mnemonic.phrase)
  });
  
  return {
    address: wallet.address,
    // Only return private key if user needs it immediately
    privateKey: wallet.privateKey
  };
}

// Send ETH from user's wallet
async function sendEther(fromUserId, toAddress, amount) {
  const userWallet = await getUserWallet(fromUserId);
  const decryptedKey = decrypt(userWallet.encryptedPrivateKey);
  
  const provider = new ethers.JsonRpcProvider('your-rpc-url');
  const wallet = new ethers.Wallet(decryptedKey, provider);
  
  const tx = await wallet.sendTransaction({
    to: toAddress,
    value: ethers.parseEther(amount)
  });
  
  return tx.hash;
}

Client-Side Generation

// In your frontend
async function generateClientWallet() {
  const wallet = ethers.Wallet.createRandom();
  
  // Store locally (user's responsibility)
  localStorage.setItem('wallet_address', wallet.address);
  localStorage.setItem('wallet_private_key', wallet.privateKey);
  
  // Send address to your backend to associate with user
  await fetch('/api/users/wallet', {
    method: 'POST',
    body: JSON.stringify({ address: wallet.address }),
    headers: { 'Content-Type': 'application/json' }
  });
  
  return wallet;
}