I have small test smart contract, which is deployed to my test network. And I want to use a server to call the function in the contract. Here is the code: payontime.sol

pragma solidity ^0.4.0;

contract payontime{
  address public remitter;
  address private remittee;
  uint value;
  bool public start;

  /*Only owner can use these function*/
  modifier onlyOwner(){
    if(msg.sender != remitter) throw;

  /*Initialize the owner*/
  function payontime(address receiver) payable{
    remitter = msg.sender;
    value = msg.value;
    remittee = receiver;
    start = true;

  function wakeUp() public returns (string){
    return "success" ; 

  function getContractAddr() public returns(address){
    return this;

  /*Get the remittee*/
  function getRemitee() public returns(address){
    return remittee;

I use truffle serve and a webpage to new the contract.


import { default as Web3} from 'web3';
import { default as contract } from 'truffle-contract'
import payontime_artifacts from '../../build/contracts/payontime.json'
var payontime = contract(payontime_artifacts);

window.App = {
    sendCoin : function(){

        var sender = web3.eth.accounts[0];
        var receiver = document.getElementById('receiver').value;
        var amount =         parseInt(document.getElementById('amount').value);
            consol.log("Before transfer: " + result );
            console.log("Error: " + error);

    var newContract = payontime.new(receiver,{from:sender, value:amount}).then(
                    console.log("After transfer: " + result );
                    console.log("Error: " + error);

window.addEventListener('load', function() {
  // Checking if Web3 has been injected by the browser (Mist/MetaMask)
  if (typeof web3 !== 'undefined') {
    console.warn("Using web3 detected from external source. If you find that your accounts don't appear or you have 0 MetaCoin, ensure you've configured that source properly. If using MetaMask, see the following link. Feel free to delete this warning. :) http://truffleframework.com/tutorials/truffle-and-metamask")
    // Use Mist/MetaMask's provider
    window.web3 = new Web3(web3.currentProvider);
  } else {
    console.warn("No web3 detected. Falling back to http://localhost:8545. You should remove this fallback when you deploy live, as it's inherently insecure. Consider switching to Metamask for development. More info here: http://truffleframework.com/tutorials/truffle-and-metamask");
    // fallback - use your fallback strategy (local node / hosted node + in-dapp id mgmt / fail)
    window.web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));

app.js logs the address 0x1d379f2ab48ad20319e9f81cb45af415aa6f2966 , and I want to use this address to call the wakeUp() in the payontime.sol through another application index.js.

const Web3 = require('web3');

/* Connect to ethereum node */
const etherUrl = "http://localhost:8545";
const abi = [{"constant":false,"inputs":[],"name":"wakeUp","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"getContractAddr","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"remitter","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"start","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"getRemitee","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"inputs":[{"name":"receiver","type":"address"}],"payable":true,"type":"constructor"}];

let web3 = new Web3();
web3.setProvider(new web3.providers.HttpProvider(etherUrl));

/*Call the function which already deployed on ethereum network
  Notice: ABI have to modifeid when the smart contract code change*/
var contractInstance = web3.eth.contract(abi).at('0x1d379f2ab48ad20319e9f81cb45af415aa6f2966');
var reply = "false";
reply = contractInstance.wakeUp.call(function(error,result){
        throw error;
        return result;

But there is an error message: BigNumber Error: new BigNumber() not a base 16 number I found it might be caused by not fully synced. I think it have some problem when I call the function in a deployed contract. So how can I call a deployed contract from web.js?

  • try BigNumber.value in your javascript.
    – niksmac
    Commented Dec 14, 2017 at 4:50

2 Answers 2


The BigNumber() is not a base 16 number error can happen in many cases, yet the causes are not necessarily the same. I believe the original post's issue is with using Events that index on "string" types, which I'm running into as well. If my contract event marks a "string" type as "indexed", i get the same error. But if I restrict the "indexed" keyword to only "address" type, I'm fine. I'm trying to find documentation on what data types can be "indexed" in a contract event, but to no avail. My gut feeling is anything that can be parsed as a number (address, integers etc) might be OK. I don't think blockchain synching is the issue here. So try removing any indexes on string fields in the event definition for now until they fix the bug.

ref:- What does the Web3 "BigNumber not a base 16 number Error" mean


From documentation of web3.js 1.0 we can call method from web3js as :

myContract.methods.myMethod([param1[, param2[, ...]]])

Lets see the example

var Web3 = require('web3')
var web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
const abi = abi_of_contract
const Contract = web3.eth.contract(abi)
var contractaddress = address_of_deployed_contract
const contractInstance = Contract.at(contractaddress)

//here I am using default account as first account from the list of addresses in the rpc enabled node
web3.eth.defaultAccount = web3.eth.accounts[0]

//calling contract function wakeUp()  

            from:   web3.eth.defaultAccount,
            to:     contractaddress           

Error Error: new BigNumber() not a base 16 number that you got may be due to address you have passed. Please make account that you are using as default account first. It may solve your problem.

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