Cfrgtkky

I tried following this repo:-

But I am getting the following error on compiling the code with :-

code = fs.readFileSync('Voting.sol').toString()

solc = require('solc')

compiledCode = solc.compile(code)

It throws out this error:-

'{"errors":[{"component":"general","formattedMessage":"* Line 1, Column 1\n  Syntax error: value, object or array expected.\n* Line 1, Column 2\n  Extra non-whitespace after JSON value.\n","message":"* Line 1, Column 1\n  Syntax error: value, object or array expected.\n* Line 1, Column 2\n  Extra non-whitespace after JSON value.\n","severity":"error","type":"JSONError"}]}'

You have to specify what type of encoding is used for the solidity file.

code = fs.readFileSync('Voting.sol', 'utf8');

and you have to specifiy the number of contracts your are about to compile.

compiledCode = solc.compile(code, 1);

I found out the answer it was because of the npm version conflicts. Make sure that you have the right version of solc.Refer this repo

I found another solution. In my case the problem was that the File.sol was raw solidity smart contract, but you need to put Compiler Standard Input JSON into solc.compile(). This works for Solidity 0.5.1. In this thread is my whole process step by step until the transaction sending.

I found that if you put your input info into the JSON format per the solidity docs, then you are good regardless of the compiler. Before compiling "stringify" the file (JSON.stringify). After the file is compiled the object will be in string form, so then you may want to parse it (JSON.parse) to work with it from there. Here is a code sample with a console.log() of the contract in JSON form so you can see what you are working with.

const path = require('path');

const fs = require('fs');

const solc = require('solc');





const inboxPath = path.resolve(__dirname, 'contracts', 'inbox.sol');

const source = fs.readFileSync(inboxPath, 'utf8');



var solcInput = {

    language: "Solidity",

    sources: { 

        contract: {

            content: source

        }

     },

    settings: {

        optimizer: {

            enabled: true

        },

        evmVersion: "byzantium",

        outputSelection: {

            "*": {

              "": [

                "legacyAST",

                "ast"

              ],

              "*": [

                "abi",

                "evm.bytecode.object",

                "evm.bytecode.sourceMap",

                "evm.deployedBytecode.object",

                "evm.deployedBytecode.sourceMap",

                "evm.gasEstimates"

              ]

            },

        }

    }

};



solcInput = JSON.stringify(solcInput);

var contractObject = solc.compile(solcInput);

contractObject = JSON.parse(contractObject);



console.log(contractObject);