Platform as a Service
Cloud PaaS typically offer extensibility through client-side scripts or special code that is run in NodeJS or RhinoJS or other engines:
Cloud computing is commonly offered as "serverless" functions, small snippets of code that are run in NodeJS or other server-side JS platforms. While SheetJS libraries can run in server-side environments, the cloud platforms can corrupt form data. This can be disabled with cloud-specific configuration:
The primary pitfall with cloud storage is binary data mangling. Spreadsheet files typically contain binary characters. Cloud storage APIs can corrupt binary data, so special care must be taken.