Read data line by line and turn in to JSON

linebyline.js

var fs = require('fs');
var readline = require('readline');
var stream = require('stream');

var instream = fs.createReadStream('test.txt', 'utf8');
var outstream = new stream;
var rl = readline.createInterface(instream, outstream);
var obj = {}

rl.on('line', function (line) {
    var lines = line.split('   ');
    obj[lines[0]] = lines[1];
});

rl.on('close', function() {
    console.log(JSON.stringify(obj));
});

output.json

{
    "1": "中文",
    "2": "or",
    "3": "&&",
    "4": "abc",
    "5": "CD"
}

test.txt

1   中文
2   or
3   &&
4   abc
5   CD