Create TON wallet from mnemonic (24 words).

index.ts

import TonWeb, {HttpProvider} from 'tonweb';
import {mnemonicToSeed} from 'tonweb-mnemonic';

(async () => {
  // First of all, create seed from mnemonic. Mnemonic is a
  // combination of 24 words. For example, you could already
  // create your wallet in TON Keeper application, where these 24
  // words were used. You can use them here too, to get access
  // to your wallet.
  const seed = await mnemonicToSeed([/* Array of 24 words goes here. */]);

  // Create HTTP Provder to perform requests to API.
  const provider = new HttpProvider();

  // Create key pair from our seed.
  const keyPair = TonWeb.utils.nacl.sign.keyPair.fromSeed(seed);

  // Create wallet.
  const wallet = new TonWeb.Wallets.all.v3R2(provider, {
      publicKey: keyPair.publicKey,
      wc: -1
  });

  // Get wallet address.
  const address = await wallet.getAddress();

  // Get current wallet address.
  const balance = await provider.getBalance(address);

  return balance;

  // Don't forget that different versions of wallets create
  // different addresses. I have already created a wallet in
  // TON Keeper and its version was V3R2, so I create wallet
  // of this type here too.
})()
  .then(console.log)
  .catch(console.error)

Great! It could work.