docs.sheetjs.com/docz/docs/03-demos/08-local/index.md

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There is no standard cross-platform approach to read and write files and data. XLSX.readFile and XLSX.writeFile rely on platform-specific APIs to perform the file read and write operations. Not all platforms support the APIs used in the library.

The demos in this section cover APIs that are not supported out-of-the-box:

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