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Welcome to a tutorial on how to create an Excel file in Javascript. Yes, you read that right. We are referring to browser Javascript, and not the server-side NodeJS. The dark days have passed and it is actually possible to generate Excel files using client-side Javascript – Read on for the examples!ⓘ I have included a zip file with all the source code at the start of this tutorial, so you dont have to copy-paste everything… Or if you just want to dive straight in.Download & NotesJS Create ExcelExtra Bits & LinksThe EndQUICK NOTESIf you spot a bug, feel free to comment below. I try to answer short questions too, but it is one person versus the entire world… If you need answers urgently, please check out my list of websites to get help with programming.SCREENSHOTEXAMPLE CODE DOWNLOADClick here to download all the example source code, I have released it under the MIT license, so feel free to build on top of it or use it in your own project.EXAMPLE 1) GENERATE EXCEL FILE & FORCE DOWNLOAD1A) THE HTML <script src=https:cdnjs.cloudflare.comajaxlibsxlsx0.18.5xlsx.full.min.js><script><button id=demo>Download Demo Excel<button>document.getElementById(demo).onclick = () => ... ;Yep, that is pretty much everything we need to drive the example.Load SheetJS from CDNJS, this library is required to create the Excel file. Will leave a link in the extras section below to their full documentation.A demo button to start generating the Excel file.Generate the Excel file when the button is clicked.1B) DUMMY DATA (C1) DUMMY DATAvar data = Joa Doe, , Job Doe, , Joe Doe, , Jon Doe, , Joy Doe, the Javascript, we will first start by defining a nested array of dummy data. Dont think it needs a lot of explanation, this will get converted into rows and columns in the Excel file.1C) CREATE A NEW EXCEL OBJECT (C2) CREATE NEW EXCEL FILEvar workbook = XLSX.utils.book_new(), worksheet = XLSX.utils.aoa_to_sheet(data);workbook.SheetNames.push(First);workbook.SheetsFirst = worksheet;This should be pretty self-explanatory for the folks who already know Excel well, but for the sake of those who are new:A workbook is simply the entire Excel file.A worksheet is a table within a workbook.A workbook can contain multiple worksheets.So what this section is doing:workbook = XLSX.utils.book_new() Creates a new Excel workbook.worksheet = XLSX.utils.aoa_to_sheet(data) Creates a new worksheet, using the dummy data array above.workbook.SheetNames.push(First) and workbook.SheetsFirst = worksheet Attach the worksheet to the workbook.1D) FORCE DOWNLOAD (C3) FORCE DOWNLOAD XLSX FILEXLSX.writeFile(workbook, demo.xlsx);Horray, we now have an Excel object. All thats left is to force download the Excel file, and allow the user to save it.EXAMPLE 2) GENERATE EXCEL FILE & UPLOAD TO SERVER2A) UPLOAD GENERATED EXCEL FILE (C3) TO BLOBvar xlsblob = new Blob( new Uint8Array(XLSX.write(workbook, bookType: xlsx, type: array )), type:applicationoctet-stream); (C4) FORM DATAvar data = new FormData();data.append(xls, xlsblob, demo.xlsx); (C5) UPLOAD TO SERVERfetch(2b-upload.php, method: POST, body: data ).then(res => res.text()).then(txt => console.log(txt));This is an alternative if you want to upload the generated Excel file to the server instead.(C3) Instead of forcing a download, we turn the workbook into a blob (binary object).(C4) Attach the Excel blob as form data.(C5) Send the Excel blob to the server… Otherwise also known as file upload.2B) SAVE THE UPLOADED EXCEL FILE <?phpecho move_uploaded_file( $_FILESxlstmp_name, __DIR__ . DIRECTORY_SEPARATOR . $_FILESxlsname) ? OK : ERROR ;On the server side, we simply save the uploaded Excel file like a normal file upload. This is a simple save uploaded file snippet in PHP.EFFICIENCY & PERFORMANCEJust a quick note that we are holding an entire Excel file in the memory with this example… This will work great for small to medium Excel files, but the massive ones are going to run into performance issues and memory limits. You may want to implement some sort of restrictions on the maximum amount of data, or look at server-side alternatives with streaming.COMPATIBILITY CHECKSArrow Functions – CanIUseArray Buffer – CanIUseUint8Array – Can I UseThis example will work on all modern Grade A browsers.LINKS & REFERENCES INFOGRAPHICS CHEAT SHEETCreate Excel File In Javascript (Click To Enlarge) I need to create a very big Excel file, but excel file in one worksheet can contain up to 65k rows. So, i want to divide all my info into several worksheets dynamical.This is my approximate code ------------------Create Excel App--------------------Excel.Application xlApp;Excel.Workbook xlWorkBook;Excel.Worksheet xlWorkSheet;object misValue = System.Reflection.Missing.Value;xlApp = new Excel.Application();xlWorkBook = xlApp.Workbooks.Add(misValue);xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(numberOfLetters); foreach (string letter in letters) xlWorkSheet.CellsrowIndex, 1 = letter; rowIndex++; xlWorkBook.SaveAs(pathXL, Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);xlWorkBook.Close(true, misValue, misValue);xlApp.Quit(); How I can add new worksheet inside of my foreach loop and using some condition give a name to worksheet (which user can see in Excel at the bottom of the page in list)? Some like that foreach (string letter in letters) if (letter == SOME) AddNewWorksheet and give name SOME xlWorkSheet.CellsrowIndex, 1 = letter; rowIndex++; And how to save all worksheets at the end?
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