NodeJS API to convert XLS to XLTX

NodeJS library to convert XLS to XLTX

Use Cells Conversion REST API to create customized spreadsheet workflows in NodeJS. This is a professional solution to convert XLS to XLTX and other document formats online using NodeJS.

Convert a XLS file to XLTX in NodeJS

API Request:

Converting file formats from XLS to XLTX is a complex task. All XLS to XLTX format transitions is performed by our NodeJS SDK while maintaining the source XLS spreadsheet's main structural and logical content. Our NodeJS library is a professional solution to convert XLS to XLTX files online. This Cloud SDK gives NodeJS developers powerful functionality and perfect XLTX output.

Code example in NodeJS using REST API to convert XLS to XLTX format

// For complete examples and data files, please go to
    const { CellsApi, CellsWorkbook_PutConvertWorkbookRequest } = require("asposecellscloud");
    const localPath = "../TestData/source/";
    var fs = require('fs');
    var path = require('path');
    const cellsApi = new CellsApi(process.env.ProductClientId, process.env.ProductClientSecret);
    var req = new CellsWorkbook_PutConvertWorkbookRequest({
        file: fs.createReadStream(localPath + "datasource.xls"),
        format: "xltx",
        .then((result) => {

How to use Node API to convert XLS to XLTX

  1. Create an account at Dashboard to get free API quota & authorization details
  2. Initialize CellsApi with Client Id, Client Secret, Base URL & API version
  3. Call cellsWorkbookPutConvertWorkbook method to get the resultant stream

System Requirements

  1. node v6.17.1 or newer