Bitcoin value with Javascript

README.md

Bitcoin Price

How to run

npm install --save request
node bitcoin-price.js

Blog Post

Saldo do Bitcoin com Javascript

bitcoin-price.js

const request = require('request');

const parseJson = (string) => {
  try{
    return JSON.parse(string);
  }catch(e) {
    return null;
  }
}

const formatWithCurrency = (value, currencySymbol) => {
  const parsed = parseFloat(value, 10);
  if (isNaN(value) || isNaN(parsed)) { return 0 }
  return currencySymbol + ' ' + parsed.toFixed(2).toString();
}

const doRequest = (url, dataResolver) =>{
  const req = (resolve, reject) => {
    request(url, (error, response, body) => {
      if (error) reject(error);
      const data = parseJson(body);
      resolve(dataResolver(data));
    });
  };
  return new Promise(req);
}

const getPriceCoinbase = () => {
  const dataResolver = (data) => { 
    return (data) ? formatWithCurrency(data.data.amount, 'U$') : null; 
  };
  return doRequest('https://api.coinbase.com/v2/prices/spot?currency=USD', dataResolver);
}

const getPriceBitcoinTrade = () => {
  const dataResolver = (data) => { 
    return (data) ? formatWithCurrency(data.data.last, 'R$') : null; 
  };
  return doRequest('https://api.bitcointrade.com.br/v1/public/BTC/ticker/', dataResolver);
}


(async () => {
  const [bitcointrade, coinbase] = await Promise.all([getPriceBitcoinTrade(), getPriceCoinbase()]);
  const text = `${bitcointrade} | ${coinbase}`;

  console.log(text);
})();