csvtojson.js

var atob = require('atob');
var encodedCsv = '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';

var decodedCsv = atob(encodedCsv);

decodedCsv = decodedCsv.split('\n');

var json = {};

for(var i = 0; i < decodedCsv.length ; i++) {
    var innerData = decodedCsv[i].split('\t');
    json.collection += JSON.stringify(innerData);
}

console.log(json);