Get Ethereum transaction confirmations count

getConfirmations.js

async function getConfirmations(txHash) {
  try {
    // Instantiate web3 with HttpProvider
    const web3 = new Web3('https://rinkeby.infura.io/')

    // Get transaction details
    const trx = await web3.eth.getTransaction(txHash)

    // Get current block number
    const currentBlock = await web3.eth.getBlockNumber()

    // When transaction is unconfirmed, its block number is null.
    // In this case we return 0 as number of confirmations
    return trx.blockNumber === null ? 0 : currentBlock - trx.blockNumber
  }
  catch (error) {
    console.log(error)
  }
}