xlsx does not provide an export named 'default'

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11-03-2025

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Troubleshooting "xlsx does not provide an export named 'default'"

The error message "xlsx does not provide an export named 'default'" typically arises when working with JavaScript libraries like xlsx (SheetJS) for handling Excel files (.xlsx). This error signifies a problem with how you're attempting to access or utilize the library's export functionality. Let's break down the causes and solutions.

Understanding the Error

The core issue is that you're likely trying to export data using an incorrect method or referencing a non-existent export function within the xlsx library. The 'default' export is not a standard part of the xlsx API. The library offers various functions for different export needs, such as creating a workbook and then exporting it to different formats.

Common Causes and Solutions

1. Incorrect Import/Require Statement:

   The most frequent cause is an incorrect import or require statement. Make sure you're importing the library correctly and accessing its functions appropriately.

   Incorrect (Example using ES modules):

   import xlsx from 'xlsx';
   // ... later ...
   let data = xlsx.default.writeFile(workbook, 'output.xlsx'); // INCORRECT
   

   Correct (Example using ES modules):

   import * as XLSX from 'xlsx'; //Import all functions and classes
   // ... later ...
   XLSX.writeFile(workbook, 'output.xlsx'); 
   

   Correct (Example using CommonJS):

   const XLSX = require('xlsx');
   // ... later ...
   XLSX.writeFile(workbook, 'output.xlsx');
   

2. Missing writeFile Function:

   The xlsx library uses the writeFile function for exporting data to an Excel file. Ensure you're using this function correctly, and that you've created a valid workbook object (workbook) before calling it.

   Incorrect: (Attempting to write directly to a file without a workbook)

   XLSX.writeFile('output.xlsx', myData); //Incorrect - requires a workbook
   

   Correct: (First create a workbook)

   const wb = XLSX.utils.book_new();
   const ws = XLSX.utils.json_to_sheet(myData);
   XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
   XLSX.writeFile(wb, 'output.xlsx');
   

3. Incorrect Data Structure:

   The data you're trying to export needs to be in a format that xlsx understands. If your data isn't structured properly (e.g., as an array of objects or a properly formatted JSON), you'll encounter errors. Use XLSX.utils.json_to_sheet() to convert your data to a worksheet.

4. Typographical Errors:

   Double-check for any typos in your code. A simple spelling mistake in function names or variable names can lead to this error.

5. Library Version Conflicts:

   Make sure you're using a compatible version of the xlsx library. Check your package.json (if using npm or yarn) for version information and ensure it's up-to-date or compatible with your other dependencies. Try running npm install xlsx (or yarn add xlsx) to ensure you have the latest version.

6. File System Permissions:

   In some cases, the error may stem from a lack of permissions to write to the specified file location. Ensure you have the necessary write permissions in the directory where you're trying to save the Excel file.

Example: Correct Export using xlsx

This example demonstrates the correct usage of xlsx to export data to an Excel file:

import * as XLSX from 'xlsx';

const jsonData = [
  { name: "Alice", age: 30 },
  { name: "Bob", age: 25 },
];

const worksheet = XLSX.utils.json_to_sheet(jsonData);
const workbook = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(workbook, worksheet, "Sheet1");
XLSX.writeFile(workbook, "output.xlsx"); 

Remember to install the xlsx library using npm or yarn: npm install xlsx or yarn add xlsx. By carefully reviewing your code and following these steps, you should be able to resolve the "xlsx does not provide an export named 'default'" error. If the problem persists, provide the relevant code snippet for more specific troubleshooting.