Excel on Digital Archive Systems Tech Bloghttps://tech.ldas.jp/en/tags/excel/Recent content in Excel on Digital Archive Systems Tech BlogHugoenThu, 02 Apr 2026 00:00:00 +0900Dynamically Generating Excel Templates with Cross-Sheet Dropdown Validation Using ExcelJS in Next.js API Routeshttps://tech.ldas.jp/en/posts/nextjs-exceljs-dynamic-template/Thu, 02 Apr 2026 00:00:00 +0900https://tech.ldas.jp/en/posts/nextjs-exceljs-dynamic-template/<p>I recently needed to implement a workflow where users download an Excel template, fill it in, and upload it back for processing. The key requirements were:</p> <ul> <li>Template contents vary per project (member lists and file lists are fetched dynamically)</li> <li>Dropdown cells should reference data in other sheets as their options</li> <li>The Excel file should be generated server-side in a Next.js API route</li> </ul> <p><a href="https://github.com/exceljs/exceljs">ExcelJS</a> handles all of this. This post covers how.</p>