xlsx 0.15.6

SheetJS, also known as 'xlsx', is a comprehensive, community-maintained JavaScript library that allows you to work with various spreadsheet formats. It's particularly useful for parsing spreadsheets and extracting meaningful data from them, as well as generating new spreadsheet files. This library offers a solution for processing a myriad of spreadsheet data formats, enabling simple data extraction from almost any complex spreadsheet and generating new spreadsheets that are compatible with both legacy and modern software.

To make use of the xlsx package, you need to install it first using npm (npm install xlsx). Then you can import and use it in your JavaScript file. There are different methods to extract and process data depending on where the spreadsheet data is coming from. Here are two simple examples of how to use the library:

1. Reading a local file in a NodeJS server:

var XLSX = require("xlsx");

var workbook = XLSX.readFile("test.xlsx");

2. Fetching a file in the web browser ("Ajax"):

var url = "http://oss.sheetjs.com/test_files/formula_stress_test.xlsx";

/* set up async GET request */
var req = new XMLHttpRequest();
req.open("GET", url, true);
req.responseType = "arraybuffer";

req.onload = function(e) {
  var workbook = XLSX.read(req.response);

  /* DO SOMETHING WITH workbook HERE */
};

req.send();

The xlsx package documentation is not explicitly mentioned in the README content. However, based on the context and the information provided, one can assume that the main source of documentation would be the README itself along with the various files and examples in the GitHub repository for the package