csv-excel-to-json/index.js

NPM Module to convert csv, excel to json format

'use strict';
exports.convertToJson = function(input, output, config) {

    var defaultConfig = {
        delimiter: ',',
        ignoreEmpty: true,
        sheetNumber: 0 // In case of Excel file
    };

    if(typeof config == 'undefined')
        config = {}

    Object.assign(config,defaultConfig);


    var headArray = [];
    var masterArray = [];


    var fs = require('fs');
    var path = require('path');

    if(path.extname(input) == ".csv"){

        var readline = require('readline');

        var rd = readline.createInterface({
            input: fs.createReadStream(input),
        });

        var countLine = 0;
        rd.on('line', function(line) {
            countLine++;

            if(countLine == 1){
                headArray = line.split(config.delimiter);
                //console.log(headArray);
                return;
            }
            
            var single = {};
            //For Rest of the rows.
            if(config.ignoreEmpty && line == '')
                return;
            var rowArray = line.split(config.delimiter);

            for (var i = 0; i < headArray.length; i++)
                single[headArray[i]] = rowArray[i];
            //console.log(single);
            masterArray.push(single);
        });

        rd.on('close', function(line) {
            fs.writeFile(output, JSON.stringify(masterArray), function(err) {
                if(err) {
                    return console.log(err);
                }
                console.log("The file was saved!");
            }); 
        });
    }else if(path.extname(input) == ".xls" || path.extname(input) == ".xlsx"){
        var xlsx = require('node-xlsx');

        var excelFile = xlsx.parse(input); // parses a file
        var sheet = excelFile[config.sheetNumber];

        //Header - For Indexes
        headArray = sheet['data'][0];

        //loop through all rows in selected sheet.
        for(var i = 1; i < sheet['data'].length; i++)
        {
            //add the row to the masterArray array
            if(config.ignoreEmpty && sheet['data'][i].length == 0)
                continue;
            var single = {};
            for (var j = 0; j < headArray.length; j++)
                single[headArray[j]] = sheet['data'][i][j];

            masterArray.push(single);
        }
        fs.writeFile(output, JSON.stringify(masterArray), function(err) {
            if(err) {
                return console.log(err);
            }
        }); 
    }
}