How to get JSON from byte array?

Question

JavaScript

The essence of the task: to display the exchange rates of the Central Bank of the Russian Federation
on the front. The answer comes compressed (gzip). I receive an array of bytes, convert it to a string in a loop and send it to the front, also with Cyrillic encoding problems.

That's all I've achieved so far. How do I get the JSON out of this so I can continue working with it on the front using React.js?

Answer 1

const {get} = require('http');
const {Iconv} = require('iconv');
const {parseString} = require('xml2js');
const {inspect} = require('util');

get('http://www.cbr.ru/scripts/XML_daily.asp', res => {
  const data = [];
  res
    .pipe(new Iconv('cp1251', 'utf8'))
    .on('data', chunk => data.push(chunk))
    .on('end', () =>
      parseString(
        Buffer.concat(data),
        (err, res) => console.log(inspect(res, {depth: null}))
      )
    );
});

Answer 2

Why do you need an array of bytes?
For starters, if you want a non-gzip returned to you, pass the 'Accept-Encoding' header correctly in the request, or don't pass it at all.
Then, XML comes to you, its encoding is specified in the first line (Windows-1251). Accordingly, you can convert to any encoding you need.
It remains only to parse the XML and generate JSON in the format you need.