There are several questions and answers discussing how to read or write .sav files:
Excel-related (e.g., How to open spss data files in excel?)PHP-related (e.g., Export data into SPSS file (*.sav))Python-related (e.g., Exporting to SPSS files in Python Django?)
Do you know how to approach this in Node.js (with or without native addons)?
I appreciate if you can share any links to related resources.