I'm trying the following script on Node.js while running a node connected to Rinkeby Testnet (from https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethcontract):

const fs = require("fs");
const solc = require('solc')

let source = fs.readFileSync('nameContract.sol', 'utf8');
let compiledContract = solc.compile(source, 1);
let abi = compiledContract.contracts['nameContract'].interface;
let bytecode = compiledContract.contracts['nameContract'].bytecode;
let gasEstimate = web3.eth.estimateGas({data: bytecode});
let MyContract = web3.eth.contract(JSON.parse(abi));

However, this code doesn't work on my computer: when I log compiledContract I can see that the key in the mapping is :nameContract and not nameContract.

When I replace in the code nameContract by :nameContract, it works. I've checked my Solidity file and there is no mistyping errors in it.

Do you have an idea why this happens? I'm using Git BASH on Windows10.


I know this comes a bit late, but it's not a bug, it's a feature, see Contract name starts with colon in compiled output:

  • Report:

solc.compile(exampleContract) returns the following. It would be good to remove colon before contract name.

  "contracts": {
     ":NameOfContract": {...}
  • Resolution:

To make contract references unambiguous in the output, newer compiler versions prefix every contract with :. This will be further expanded in the next version where a proper json object will be returned, so please stay tuned for a "fix".

  • Note:

I close this as it is not a "bug", just how the compiler works.

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