How to fix replacement character (�) when I want to print cyrillic symbols from file?

Question

When I'm reading lines from file I'm trying to print some strings which contain english and russian words. I'm getting replacement characters (�����) instead cyrillic symbols in my console. If I'm trying to return an array of lines I'm getting same trouble.

A plain line looks like:

URL: GET /products/1234
Message: [transaction ID: 324] Отправка Get запроса: http://...//

URL: POST /products/1234
Message: [transaction ID: 324] Отправка Post запроса: http://...//

Console prints:

URL: GET /products/1234
Message: [transaction ID: 324] ���������������: http://...//

URL: POST /products/1234
Message: [transaction ID: 324] ���������������: http://...//

The same is written to the array(� instead lines with cyrillic chars):

[
    "URL:       GET       /products/1234      Message: [transaction ID: 324 ���������������: http://...//",
    "URL:       POST       /products/1234      Message: [transaction ID: 324 ���������������: http://...//",   
]

How can I fix it?

//function to watch for file's changes:
function readFileChanges(file) {
        const Tail = require('tail').Tail;
        const tail = new Tail(file);
        let dataLines = [];
        tail.watch();
        tail.on("line", data => {
            console.log(data);
            dataLines.push(data);
        });
        return dataLines;
    };

I expect to get array with lines containing cyrillic chars, not �-s:

[
    "> URL:       GET       /products/1234      Message: [transaction ID: 324] Отправка Get запроса: http://...//",

    "> URL:       POST       /products/1234      Message: [transaction ID: 324] Отправка Post запроса: http://...//"
]

and appropriate console-output.

Platform is win7 and win10, node version is 10.x

Thank you so much in advance!

Answer 1

Try this:

const iconv = require('iconv-lite');
const Tail = require('tail').Tail;

function readFileChanges(file) {
        const tail = new Tail(file, {encoding: "binary"});
        let dataLines = [];
        tail.watch();
        tail.on("line", data => {
            data = iconv.decode(data, "cp1251").toString();
            console.log(data );
            dataLines.push(data);
        });
        return dataLines;
    };