Tag: #xlsx
7 articles
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Batch-process spreadsheet data with AI: xlsx → JSON → LLM
A practical pipeline for running an LLM over a whole spreadsheet: convert xlsx to JSON in the browser, send rows to Claude for classification or cleanup, and write the results back into the grid — with the Batch API for scale.
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From Excel to your app: extract structured data from xlsx as JSON
A practical pattern for turning user-uploaded Excel files into clean JSON your app can use — header detection, type coercion, multiple sheets, and posting straight to an API or database.
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Convert XLSX to JSON in the browser — no server, no upload
Turn an .xlsx file into JSON entirely client-side: lossless ReoGrid JSON for round-tripping, or plain data rows for your app. Practical code, files never leave the browser.
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When Excel is your layout tool: move merged-cell forms to the web without rebuilding them
A lot of business 'spreadsheets' are really forms — merged cells, borders, fixed column widths, embedded formulas. Two practical ways to bring them to the web with ReoGrid Web: load the existing .xlsx as-is, or rebuild it in code. With working examples.
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Reading and writing Excel files in JavaScript — import, export, and JSON
How to load .xlsx files into the browser, export a grid back to Excel, and convert between xlsx and JSON — all client-side, with styles and formats preserved. Practical code with ReoGrid Web.
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Build an online XLSX viewer in React — files never leave the browser
Most 'XLSX viewer online' tools upload your spreadsheet to a server you don't control. Here is a complete React component that opens .xlsx files entirely in the browser — read-only, with styles, merges, and formulas preserved. No upload, no backend, no account.
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Importing real Excel files in the browser — no upload, no server
Drag an .xlsx file onto a web page, render it in a spreadsheet UI with cell styles, merges, borders, freeze panes, and formulas preserved. No backend, no SheetJS, no progress modals — and it loads a 440k-cell file in 3.7 seconds.