Running JavaScript code by Terminal: “Uncaught Reference Error: callback is not defined”


Running JavaScript code by Terminal: “Uncaught Reference Error: callback is not defined”



I want to get the output of following JavaScript code (i.e. a signed message) by Terminal (cmd).


Terminal


cmd




function constructPaymentMessage(contractAddress, amount) {
return ethereumjs.ABI.soliditySHA3(
["address", "uint256"],
[contractAddress, amount],
);
}

function signMessage(message, callback) {
web3.personal.sign("0x" + message.toString("hex"), web3.eth.defaultAccount,
callback);
}

// contractAddress is used to prevent cross-contract replay attacks.
// amount, in wei, specifies how much ether should be sent.
function signPayment(contractAddress, amount, callback) {
var message = constructPaymentMessage(contractAddress, amount);
signMessage(message, callback);
}

signPayment('0xca35b7d915458ef540ade6068dfe2f44e8fa733c', 1, callback);



I have already installed ethereumjs-abi that is needed for this code.
So, I have saved this code in a example.js file, however, it seems that I need to add invoking signPayment function in this file.
For example:


ethereumjs-abi


signPayment


signPayment('0xca35b7d915458ef540ade6068dfe2f44e8fa733c', 1, callback);



However, I am not sure about this approach of running .js file by Terminal. And I do not know eventually how to run this file to see its output (i.e. a signed message.)
Meanwhile, apparently signPayment does not return any value as output.


js


Terminal


signPayment


return


output



Here is the message that i receive:


root@ubuntu:/home/s# node sign.js
/home/s/sign.js:20
signPayment('0xca35b7d915458ef540ade6068dfe2f44e8fa733c', 1, callback);
^

ReferenceError: callback is not defined
at Object.<anonymous> (/home/s/sign.js:20:62)
at Module._compile (internal/modules/cjs/loader.js:654:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:665:10)
at Module.load (internal/modules/cjs/loader.js:566:32)
at tryModuleLoad (internal/modules/cjs/loader.js:506:12)
at Function.Module._load (internal/modules/cjs/loader.js:498:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:695:10)
at startup (internal/bootstrap/node.js:201:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:516:3)



How to get the out put of this JavaScript code ?



Note: I saved the JavaScript code in a .js file (You can see the content of this .js file HERE.) However, when I run this file by node filename.js I receive the error message that I uploaded the screen shot HERE. I do not know where I am going wrong.


JavaScript


.js


node filename.js









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