cancel transaction on Ethereum blockchain

cancel_transaction_by_txId

// 1. replace {eth_tx_id_you_want_to_cancel_here} with the transaction id you want to cancel
// 2. $ node cancelTransaction.js
// [notice] you need to run this code before your transaction included into blockchain.
// Depends on network status, you can not cancel. Use this code with your own reponsibility. And there's no guarantee if this works.

var Web3 = require("web3");
var web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
var eth = web3.eth;

var jayson = require("jayson"); // need to install jayson. "$ npm install jayson"
var client = jayson.client.http({
    host: "localhost",
    port: 8545
});

var targetCancelTxId = "{eth_tx_id_you_want_to_cancel_here}";

cancelTransaction(targetCancelTxId)

function cancelTransaction(cancelTransactionId){
    var transactionDetail = web3.eth.getTransaction(cancelTransactionId)
    var cancelTxFrom = transactionDetail.from;
    var cancelTxNonce = transactionDetail.nonce;
    var cancelGasPrice = transactionDetail.gasPrice;
    if(cancelTxFrom && cancelTxNonce && cancelGasPrice){
        sendToMyselfWithSameNonce(cancelTxFrom, cancelTxNonce, cancelGasPrice)
    }
}

function sendToMyselfWithSameNonce(cancelFromAddress, cancelNonce, cancelGasPrice){
    var gas = 300000;
    var gasPrice = cancelGasPrice * 10; // 10 times higher gasPrice than the transaction you want to cancel
    var sendingWei = 0;
    var params = [{
        "from": cancelFromAddress,
        "to": cancelFromAddress,  // send to myself to cancel.
        "gas": "0x" + gas.toString(16), //,
        "gasPrice":"0x" + gasPrice.toString(16), //
        "value": "0x" + sendingWei.toString(16), //
        "nonce": "0x" + cancelNonce.toString(16),
        "data": "" // 
    }]
    console.log(params)
    if(!cancelFromAddress){
        return
    }
    client.request('eth_sendTransaction', params, function(err, response) {
        if(err) {
            console.log(err)
        }
        console.log(response); // 2
    });
}