When JS Libraries Fail at 1M Rows: Generating XLSX via DuckDB SQL

📰 Dev.to · Yuki Nakazawa

Learn to generate XLSX files using DuckDB SQL when JavaScript libraries fail with large datasets like 1M rows

intermediate Published 10 Mar 2026
Action Steps
  1. Use DuckDB to create an in-memory database
  2. Import your CSV data into DuckDB using SQL
  3. Run SQL queries to manipulate and analyze the data
  4. Use the DuckDB SQL API to generate an XLSX file from the query results
  5. Test and optimize the performance of the XLSX generation process
Who Needs to Know This

Data analysts and developers working with large datasets in the browser can benefit from this approach to efficiently generate XLSX files

Key Insight

💡 DuckDB SQL can efficiently handle large datasets that JavaScript libraries struggle with

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🚀 Generate XLSX files from large datasets using DuckDB SQL! 📊

Key Takeaways

Learn to generate XLSX files using DuckDB SQL when JavaScript libraries fail with large datasets like 1M rows

Full Article

Introduction I've been building LeapRows — a browser-based CSV analysis tool that runs...
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