Excel to JSON Converter

Spreadsheets are how most non-engineering teams hand off structured data — product catalogs, survey exports, finance reports — but almost every downstream system (APIs, no-code tools, data pipelines) expects JSON, not .xlsx binary format. Converting by hand means writing a throwaway script or copy-pasting cell by cell, which doesn't scale past a few dozen rows and breaks silently on merged cells or multiple sheet tabs.

This tool parses the workbook client-side, lets you preview the data and pick which worksheet to export if the file has more than one tab, and handles large exports (100K+ rows) with pagination so the browser doesn't choke rendering a giant preview table. The output is clean, nested-free JSON with column headers as keys — ready to drop into a script, seed a database, or import into another tool.