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In-memory processing
Excel to JSON runs as JavaScript inside this tab.
Never uploaded
Safe for financials, contracts and NDAs.
No caps or sign-ups
File size is limited only by device memory.
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Convert Excel to JSON to feed spreadsheet data into a web app, API, test fixture or no-code tool. The first sheet becomes an array of objects keyed by the header row.
Also known as XLSX to JSON.
An array of row objects from the first sheet. The header row provides the property names, and each later row becomes one object. Empty cells are left out of that row's object.
Yes. Excel to JSON runs entirely inside your web browser using JavaScript, so the file never leaves your device. It is safe for confidential documents such as contracts, financial records and IDs.
There is no fixed limit, because the file is processed on your own device. Very large files depend on your device's available memory; a modern laptop or phone handles hundreds of megabytes.
Yes. ZapConvert runs in any modern browser, including Safari on iPhone and iPad and Chrome on Android, with nothing to install. You can add several files at once and download them together as a ZIP.