Convert a JSON array to a CSV table locally - object keys become columns, no upload, right in your browser.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
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No re-upload neededThese tools accept .CSV - your file is handed over directly.
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
JSON is the format of APIs and web apps, CSV the format of spreadsheets like Excel, Numbers or LibreOffice Calc. To analyse API data in a spreadsheet you need the path from JSON back to CSV - each object in the array becomes a row, and the keys become the column headers.
This tool reads your JSON entirely locally in the browser (papaparse, pure JavaScript). It expects an array of objects - or an object that contains one (e.g. {"data": [ ... ]}). The union of keys across all rows forms the column set, so objects with differing fields still line up cleanly.
Nothing is uploaded - the conversion even works offline. Your data never leaves your device, unlike online converters that send JSON to third-party servers.
Online converters for JSON to CSV often require an account for larger files or cap the row count significantly on the free tier. This tool has no row limit other than your device memory, needs no account, and even works offline after the first load.
| Input formats | JSON |
|---|---|
| Auto-conversion | XLSX, SQLite |
| Output format | CSV |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Expects a flat array of objects (or an object containing one). Nested objects/arrays in a cell are written as text, not exploded into their own columns - for tabular data the result is clean. Very large files need memory.
No. The conversion runs entirely locally in the browser - nothing is sent.
An array of objects, e.g. [{"name":"A","value":1}, ...] - or an object containing such an array.
Nested objects/arrays are written as text into the cell. For flat tabular data the result is ideal.
No, the columns are the union of all keys; missing fields stay empty.
Yes, use the "CSV to JSON" tool.
Yes, in any current mobile browser just like on desktop - the file stays local.
No. No account and no artificial row limit - only your device memory sets a boundary for very large files.
Yes. The file is parsed locally and never sent to a server - that applies just as much to API responses containing personal data.
CSV to JSON · XLSX to CSV · CSV to XLSX · JSON to Markdown · JSONL to JSON · JSON to JSONL