A key feature of this automatic cloud solution is its use of Vanilla JavaScript, specifically XMLHttpRequest and the Fetch API, to interact directly with remote APIs without relying on wrappers, SDKs, or third-party drivers. This approach ensures lightweight, browser-native execution that's easy to embed into any web-based workflow. With Fetch, developers can send two spreadsheet files as Blob or FormData objects to cloud endpoints for comparison, then handle the response asynchronously using Promises or async/await. For environments requiring legacy support or synchronous control, XMLHttpRequest provides a robust alternative, allowing fine-grained control over request headers, response types, and event listeners. This dual capability ensures compatibility across modern and older platforms while maintaining full transparency over how data is transmitted and received.

The solution supports a wide range of spreadsheet formats including CSV, TSV, Excel, and Apple Numbers by routing each file type through a tailored processing pipeline. Differences between the two files are detected and highlighted in a result file, which can be exported in various formats. This modular design allows the system to handle diverse formats without installing external libraries or drivers. Combined with real-time feedback, secure file validation, and seamless integration into broader workflows, the solution offers a fast, scalable, and dependency-free method for automating spreadsheet comparison.