first commit

Back/src/app.js

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+var http = require("http");
+var express = require('express');
+var app = express();
+
+app.use(function(req, res, next) {
+  res.header("Access-Control-Allow-Origin", "*");
+  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
+  next();
+});
+
+var ApplicationController = require('./application_controller');
+app.use('', ApplicationController);
+module.exports = app;

Back/src/application_controller.js

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+var express = require('express');
+var router = express.Router();
+const api_helper = require('./thirdparty_api')
+const config = require('./config');
+
+
+
+router.get('/coins/markets', function (req, res) {
+  // let pair = req.query.pair;
+  // let interval = req.query.interval;
+  
+  let url = config.coingecko.api_url + '/coins/markets?vs_currency=usd&order=market_cap_desc&per_page=100&page=1&sparkline=false';
+
+  api_helper.REMOTE_API_call(url)
+    .then(response => {
+      console.log("url: ", url);
+      console.log("response: ", response);
+      res.json(response);
+    })
+    .catch(error => {
+      console.log("error: ", error);
+      res.send(error);
+    })
+})
+
+module.exports = router;

Back/src/config.js

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+const config = {
+ app: {
+   port: 8080
+ },
+ coingecko: {
+  api_url: 'https://api.coingecko.com/api/v3'
+} 
+};
+
+module.exports = config;

Back/src/thirdparty_api.js

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+const request = require('request')
+
+module.exports = {
+    REMOTE_API_call : function(url){
+        return new Promise((resolve, reject) => {
+            request(url, { json: true }, (err, res, body) => {
+              if (err) reject(err)
+              resolve(body)
+            });
+        })
+    }
+}