Free CSV to JSON Converter
Turn a spreadsheet export into API-ready JSON — or JSON back into a spreadsheet — without uploading customer data. Quoted commas, embedded line breaks and leading-zero codes are handled correctly.
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| Feature | Free | Pro |
|---|---|---|
| CSV to JSON and JSON to CSV | Yes | Yes |
| Delimiter auto-detect (comma, semicolon, tab, pipe) | Yes | Yes |
| Conservative type inference (ZIP codes stay strings) | Yes | Yes |
| Nested dot-notation keys | Yes | Yes |
| Batch conversion of many files | — | Yes |
| Ads | — | Yes |
Frequently asked questions
Why are my values strings by default?
CSV has no type system — every cell is text. Turning text into numbers by default would silently turn ZIP code 007 into 7. Type inference is opt-in, and even then leading-zero values stay strings.
What happens to commas inside a quoted field?
They are kept as part of the value, as RFC 4180 requires — a quoted field may also hold a line break or an escaped quote (double double-quote).
Does JSON to CSV need an array?
Yes: an array of objects. Columns are the union of every object's keys, and nested objects or arrays become a JSON string in one cell.
Is my data uploaded?
No. Parsing and conversion run entirely in your browser; the file is read locally and never sent anywhere.