airdrop.ts

import { Connection, Keypair, LAMPORTS_PER_SOL } from "@solana/web3.js"

import wallet from "./dev_wallet.json"

const keypair = Keypair.fromSecretKey(new Uint8Array(wallet));
const connection = new Connection("https://api.devnet.solana.com");

(async () => {
  try {
    // We're going to claim 2 devnet SOL tokens
    const txhash = await
      connection.requestAirdrop(keypair.publicKey, 2 * LAMPORTS_PER_SOL);
    console.log(`Success! Check out your TX here:
https://explorer.solana.com/tx/${txhash}?cluster=devnet`);
  } catch (e) {
    console.error(`Oops, something went wrong: ${e}`)
  }
})();