There is no upload endpoint — your files are processed in this browser tab. Open your network tab and check. See how it stays private.
How to csv to json
- Add your data. Drop a CSV, JSON, or spreadsheet file onto the tool, or paste the text.
- Choose the output. Pick the target format, such as JSON array-of-objects from CSV rows.
- Convert. The rows are parsed and rewritten locally into the format you chose.
- Download or copy. Save the converted file or copy the result for your code.
"CSV to JSON" is the glue task between a spreadsheet export and code that expects structured data: seeding a database, feeding an API, or driving a script. The awkward part is that the data is often a customer list or financial export you should not paste into a random converter.
Running it locally keeps those rows on your device while still giving you a clean array-of-objects from the header and rows, correct handling of quoted fields, and the reverse conversions back to CSV or Excel.
For heavier work — querying with SQL, removing personal data, or de-duplicating — reach for the DuckDB SQL and PII scrub tools; to turn the JSON into typed models, use JSON to types.
Frequently asked questions
How are CSV rows turned into JSON?
The header row becomes object keys and each following row becomes an object, producing a JSON array of objects — the shape most APIs and scripts expect.
Can it handle Excel files too?
Yes. You can convert between CSV, JSON, and spreadsheet formats, so an .xlsx export can become JSON without a round trip through another app.
What about commas inside fields?
Quoted fields are parsed correctly, so values containing commas or line breaks stay intact rather than splitting into extra columns.
Is my data uploaded to convert it?
No. Parsing and conversion happen in your browser tab; the rows never leave your device — important for customer or financial data.