Fetching basic token (mint) info (through getAccountInfo), e.g.: total supply, mintAuthority, freezeAuthority...

rpc_fetch_token_mint_info.ts

import * as web3 from "@solana/web3.js";
import { TOKEN_PROGRAM_ID, unpackMint, Mint } from "@solana/spl-token";

//////////////////////////////////////////////////

async function getTokenInfo(conn: web3.Connection, tokenMint: web3.PublicKey): Promise<Mint | null> {
  const info = await conn.getAccountInfo(tokenMint);
  if (!info) return null;

  try {
    let mint: Mint | null = unpackMint(tokenMint, info, TOKEN_PROGRAM_ID);
    return typeof mint === "object" ? mint : null;
  } catch (e) {}
  return null;
}

//////////////////////////////////////////////////

(async (rpcUrl: string) => {

  const conn = new web3.Connection(rpcUrl, "confirmed");

  const tokenMint = new web3.PublicKey("EKpQGSJtjMFqKZ9KQanSqYXRcF8fBopzLHYxdM65zcjm");
  const tokenInfo = await getTokenInfo(conn, tokenMint);
  if (!tokenInfo) return;

  //////////////////////////////////////////////////

  console.log(`Token info (${tokenMint.toBase58()}):`);
  console.dir(tokenInfo);

  //
  //   --- OUTPUT ---
  //
  //     Token info (EKpQGSJtjMFqKZ9KQanSqYXRcF8fBopzLHYxdM65zcjm):
  //     {
  //       address: PublicKey [PublicKey(EKpQGSJtjMFqKZ9KQanSqYXRcF8fBopzLHYxdM65zcjm)] {
  //         _bn: BN { negative: 0, words: [Array], length: 10, red: null }
  //       },
  //       mintAuthority: null,
  //       supply: 998905893700562n,
  //       decimals: 6,
  //       isInitialized: true,
  //       freezeAuthority: null,
  //       tlvData: Buffer(0) [Uint8Array] []
  //     }
  //
  //   --------------
  //

})(process.env.SOL_RPC_URL || "https://mainnet.helius-rpc.com/?api-key=00000000-0000-0000-0000-000000000000");