Excel Add-ins: Automate Data and Workflows with Office.js

Excel remains the backbone of business data for many organizations. Custom add-ins can automate repetitive tasks, pull data from APIs, enforce formatting, and integrate with your backend.

Excel JavaScript API

This post focuses on the Excel JavaScript API: reading and writing ranges, working with tables and charts, defining custom functions, and using the request context batching for performance. We also cover scenarios like refreshing data from a service, validating input, and pushing results to SharePoint or your database.

// Queue operations, then sync once
await Excel.run(async (context) => {
  const sheet = context.workbook.worksheets.getActiveWorksheet();
  const range = sheet.getRange("A1:B2");
  range.values = [["Hello", "World"], [1, 2]];
  await context.sync();
});

Whether you need a simple task pane that fills a template or a full dashboard that talks to Microsoft Graph and external APIs, the same patterns apply. We'll show real-world examples and tips for avoiding common pitfalls.