Streaming

Xlsxtream is a streaming writer for XLSX spreadsheets. It supports multiple worksheets and optional string deduplication via a shared string table (SST). Its purpose is to replace CSV for large exports, because using CSV in Excel is very buggy and error prone. It's very efficient and can quickly write millions of rows with low memory usage.Xlsxtream does not support formatting, charts, comments and a myriad of other OOXML features. If you are looking for a fully featured solution take a look at axslx.Xlsxtream supports writing to files or IO-like objects, data is flushed as the ZIP compressor sees fit.