Error: Invalid JSON RPC response: "" (create address locally and deploy contract)

[justcodify]

I have use case where when user sign up to my app, i create address and assign to him then need to store some info in contract & deploy to public ethereum. one user has single address but multiple contracts to be deployed.

this is my code: I am testing through command prompt "node test.js"

var Web3 = require("web3");
var url = 'https://ropsten.infura.io/v3/{key}';
var web3 = new Web3(new Web3.providers.HttpProvider(url));
var address = '0xxxxxxxxxxxxxxxxxxxxxxxx';
web3.eth.defaultAccount = address;
const fs = require("fs");
const solc = require("solc");
const input = fs.readFileSync("./CertContract.sol");
var output  = solc.compile(input.toString(),1);

var contract = output.contracts[":CertContract"];
var byteCode = contract.bytecode;
var abi = JSON.parse(contract.interface);
const certContract = new web3.eth.Contract(abi, address);
var auth = new web3.eth.Contract(abi, address);
auth.deploy({data: "0x"+byteCode, arguments: [1,'1']})
    .send({
        from: address,
        gas:1000000
    }, function(error, transactionHash){ 
            console.log(error);
        console.log(transactionHash);
    });

I getting an error:

Error: Invalid JSON RPC response: ""
at Object.InvalidResponse (E:\Projects\ethereum\node_modules\web3-core-helpers\src\errors.js:42:16)
at XMLHttpRequest.request.onreadystatechange (E:\Projects\ethereum\node_modules\web3-providers-http\src\index.js:87:32)
at XMLHttpRequestEventTarget.dispatchEvent (E:\Projects\ethereum\node_modules\xhr2-cookies\dist\xml-http-request-event-target.js:34:22)
at XMLHttpRequest._setReadyState (E:\Projects\ethereum\node_modules\xhr2-cookies\dist\xml-http-request.js:208:14)
at XMLHttpRequest._onHttpResponseEnd (E:\Projects\ethereum\node_modules\xhr2-cookies\dist\xml-http-request.js:318:14)
at IncomingMessage. (E:\Projects\ethereum\node_modules\xhr2-cookies\dist\xml-http-request.js:289:61)
at IncomingMessage.emit (events.js:185:15)
at endReadableNT (_stream_readable.js:1101:12)
at process._tickCallback (internal/process/next_tick.js:114:19)

[JoshuaQYH]

    .send({
        from: address,
        gas: '1000000'  ------ here try to use the string.
    }, function(error, transactionHash){ 
            console.log(error);
        console.log(transactionHash);
    });

Getting the "" response means the server probably dropped the connection unexpectedly. Sometimes, you should check if your network is ok, or check the format of your data.

[roschler]

@justcodify See this related thread:

#78

The suggestion @JoshuaQYH is one that affected me in a previous run-in with this error. Make sure that all the gas related values you pass to any Web3JS calls are converted to BigNumbers using the web-utils toBN() method.

Unfortunately I have this error once again but the above suggestion did solve one occurrence of that erro for me about a month ago.

[justcodify]

I found the problem and solved by adding my HD Wallet account using private key. infura only provides interface.

const path = require('path');
var Web3 = require("web3");
const solc = require("solc");
var provider = new Web3.providers.HttpProvider("infura url");
var web3 = new Web3(provider);
const input = fs.readFileSync(__dirname + path.sep + "CertitudeContract.sol");
var output = solc.compile(input.toString(), 1);
var contract = output.contracts[":NameOfContract"];
var byteCode = contract.bytecode;
var abi = JSON.parse(contract.interface);
var acct = web3.eth.accounts.privateKeyToAccount("private key of your wallet account");
web3.eth.accounts.wallet.add(acct);
web3.eth.defaultAccount = acct.address;
var auth = new web3.eth.Contract(abi, acct.address);
auth.deploy({
        data: "0x" + byteCode, arguments: [  ] // contract's constructor arguments
    }).send({
            from: acct.address,
            gas: 1000000 // it should be lil high
        }, (e, transactionHash) => {
            if (e) {
                console.log("In Error e");
                console.log(e);
                // here u can reutrn error.
            }
            else {
                console.log(transactionHash);
            }
        }).then(async function (obj) {
            console.log(obj.options.address); //this will be address of created smart contract
     });