Modify existing Excel File using node.js

Question

Is there any way to modify existing excel file in node.js? I've looked into exceljs but it does not provide any functionality that will just modify the existing data. It seems like it will write to a new stream.

Or did I miss something on exceljs?

Thanks in advance.

Answer 1

exceljs does let you modify Excel spreadsheets.

Here's an example of reading in an existing spreadsheet and writing it back out to a different file:

var Excel = require('exceljs');
var workbook = new Excel.Workbook();

workbook.xlsx.readFile('old.xlsx')
    .then(function() {
        var worksheet = workbook.getWorksheet(1);
        var row = worksheet.getRow(5);
        row.getCell(1).value = 5; // A5's value set to 5
        row.commit();
        return workbook.xlsx.writeFile('new.xlsx');
    })

If you're using the Streams API with exceljs, you can also pipe your stream into fs.createWriteStream to write to a file as well.

Answer 2

You can modify excel, below is the example.

var Excel = require('exceljs');
async function excelOp() {
    let workbook = new Excel.Workbook();
    workbook = await workbook.xlsx.readFile('question_39869739.xlsx'); // replace question_39869739.xls with your file
    let worksheet = workbook.getWorksheet('sheetname'); // replace sheetname with actual sheet name
    worksheet.getRow('rowNumber').getCell('cellNumber').value = 350; // replace rowNumber and cellNumber with the row and cell you want to modify
    workbook.xlsx.writeFile('question_50508131.xlsx');
}

excelOp();

Have a look at https://www.npmjs.com/package/exceljs#interface for all the possible operations with exceljs.