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Dev Tools · 9h ago

Dart library writes million-row Excel files with flat memory usage

By Meridian48 News Desk · Summarised from DEV Community ·

A Dart developer created an FFI wrapper over libxlsxwriter to generate large .xlsx files without memory spikes. The constant-memory mode uses ~191 MiB regardless of row count, versus 1.4 GiB for in-memory alternatives. The package is available on pub.dev for server-side Dart applications.

Meridian48 take
The memory numbers are compelling, but the package's reliance on a C library via FFI may limit adoption in pure-Dart or web environments.
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Writing a million-row .xlsx from Dart without running out of memory →
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