Token Tester for MEW

README.md

To run: npm install && node index.js

Note: You must have Geth running. Geth (hehe) it here. After installing, run geth --rpc

index.js

/*
This checker assumes you have geth installed and running.
*/

const fs = require('fs');
const Web3 = require('web3');
const fetch = require('node-fetch');

let web3 = new Web3();
web3.setProvider(new web3.providers.HttpProvider("http://127.0.0.1:8545"));

async function run() {
  const response = await fetch('https://raw.githubusercontent.com/kvhnuke/etherwallet/mercury/app/scripts/tokens/ethTokens.json');
  const tokens = await response.json();
  parseTokens(tokens);
}

async function checkToken(token) {
  let newToken = await web3.eth.getCode(token).then((err, res) => {
    if(err) throw err;
    return res;
  }).catch(err => {
    return err;
  });

  return newToken;
}

function parseTokens(arr) {
  var newArr = [];
  var nonErc20 = [];
  var counter = 0;
  arr.forEach(item => {
    counter++;
    checkToken(item.address).then(res => {
      if(res !== '0x') {
        newArr.push(item);
      } else {
        nonErc20.push(item);
      }

      if(counter === arr.length) {
        if(newArr.length > 0) {
          createNewFile('ethToken.json', newArr);
        }

        if(nonErc20.length > 0) {
          createNewFile('nonErc20.json', nonErc20);
        }
      }
    });
  });
}

function createNewFile(name, arr) {
  fs.writeFileSync(name, JSON.stringify(arr));
}

run();

package.json

{
  "name": "token-tester",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "node-fetch": "^2.1.2",
    "web3": "^1.0.0-beta.33"
  }
}