const result = await ExpressSDK.erc721.nft.batchMint(
  web3, // Web3 instance configured with metamask provider
  chainId, // Network id of blockchain
  minterAddress, // Address of Minter
  totalNFT, // Number of tokens to mint
  arraytokenURI, // array of TokenURI String for each token
  royalties // array of royalties for each token
    royalties are of the form: [ royaltyArrayForToken1,
                                 royaltyArrayForTokenN ]

It emits the same events as by Mint for all N tokens where N is the total number of tokens minted through batchMint.