Compiling and deploying an Ethereum Smart Contract, using solc and web3.

web3-solc-contract-compile-deploy.js

const fs = require('fs');
const solc = require('solc');
const Web3 = require('web3');

// Connect to local Ethereum node
const web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));

// Compile the source code
const input = fs.readFileSync('Token.sol');
const output = solc.compile(input.toString(), 1);
const bytecode = output.contracts['Token'].bytecode;
const abi = JSON.parse(output.contracts['Token'].interface);

// Contract object
const contract = web3.eth.contract(abi);

// Deploy contract instance
const contractInstance = contract.new({
    data: '0x' + bytecode,
    from: web3.eth.coinbase,
    gas: 90000*2
}, (err, res) => {
    if (err) {
        console.log(err);
        return;
    }

    // Log the tx, you can explore status with eth.getTransaction()
    console.log(res.transactionHash);

    // If we have an address property, the contract was deployed
    if (res.address) {
        console.log('Contract address: ' + res.address);
        // Let's test the deployed contract
        testContract(res.address);
    }
});

// Quick test the contract

function testContract(address) {
    // Reference to the deployed contract
    const token = contract.at(address);
    // Destination account for test
    const dest_account = '0x002D61B362ead60A632c0e6B43fCff4A7a259285';

    // Assert initial account balance, should be 100000
    const balance1 = token.balances.call(web3.eth.coinbase);
    console.log(balance1 == 1000000);

    // Call the transfer function
    token.transfer(dest_account, 100, {from: web3.eth.coinbase}, (err, res) => {
        // Log transaction, in case you want to explore
        console.log('tx: ' + res);
        // Assert destination account balance, should be 100 
        const balance2 = token.balances.call(dest_account);
        console.log(balance2 == 100);
    });
}

Who is the from in this case: https://gist.github.com/tomconte/4edb83cf505f1e7faf172b9252fff9bf#file-web3-solc-contract-compile-deploy-js-L20

I deployed and it said I don't have enough gas. Using the greeter example contract. I also had to use geth to run rpc unlocked....

I have Token.sol that it is referring to.
When deployed with node it is giving error:

Error: Cannot find module 'web3'

And with npm
TypeError: Cannot read property 'bytecode' of undefined

@base698 Can you help me out?

For those wondering how to run this:

https://github.com/ethereum/web3.js/

open a command prompt or terminal and type node....then all of the commands should work

The problem can be resolved by changing the name of Token. If you print the json string ,you will find the property of 'Token' should be ':Token'. So just change '[Token]' to '[:Token]'. Best wishes!

Hi all, I am currently having a TypeError;
...

$ node app.js

TypeError: web3.eth.contract is not a function
at Object. (/Users/foo/Developer/btc/contracts/app.js:15:27)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Function.Module.runMain (module.js:441:10)
at startup (node.js:139:18)
at node.js:974:3

--
node -v : v4.6.0
npm -v : 2.15.9
on OSX : 10.12.6 (Sierra)

I've changed the code a little bit, seems we need to use 'Contract'' instead of 'contract' while instance generation.

// app.js
// Deploy contract instance

const abi = JSON.parse(output.contracts[':Token'].interface);
const contract = new web3.eth.Contract(abi, '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe', {
    data: '0x' + bytecode,
    from: web3.eth.coinbase,
    gas: 90000*2
}, (err, res) => {
    if (err) {
        console.log(err);
        return;
    }

now there is no error back.
I've referenced from https://web3js.readthedocs.io/en/1.0/web3-eth-contract.html for the address 0x..BAe

Anyone can help me, when I use solc and build in webpack, I get error: Uncaught TypeError: Cannot read property 'prototype' of undefined
at patch (graceful-fs.js:166) and load web fail? Thank you

Hello guys,
I am facing a error : TypeError: Cannot read property 'bytecode' of undefined
occuring on line : const bytecode = output.contracts['Token'].bytecode;

@ADitya024
Change it to:
output.contracts['Token']["bytecode"];

Hi guys,

I am currently trying to adopt this source code for my school project. But may I know what is the folder structure for this project? Because I can't seemed to grasp how the code retrieve the Token.sol (Line 9)