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In-memory processing
CSV 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 CSV to JSON when a web app, API or JavaScript project needs tabular data as objects. Each row becomes an object, using the header row for the property names.
The first row supplies the keys. Every following row becomes a JSON object with those keys, so a CSV with columns name and email becomes an array like [{"name": ..., "email": ...}].
Yes. CSV 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.