CSV ↔ JSON
Convert between CSV and JSON formats with PapaParse engine. Auto-detection and dynamic typing.
Convert between CSV and JSON formats instantly. Powered by PapaParse — handles any delimiter, quoted fields, and large files.
How do I use CSV ↔ JSON?
Select your conversion direction (`CSV → JSON` or `JSON → CSV`) and click 'Load Sample' or paste/upload your dataset.
Choose your column delimiter (Comma, Semicolon, Tab, or Pipe) and click 'Convert Now'.
Switch between Raw Code and Table Preview to inspect the converted rows, then copy or download your `.json` or `.csv` file.
What features does CSV ↔ JSON offer?
Bidirectional CSV ↔ JSON conversion
Auto-delimiter detection (comma, tab, semicolon)
Support for large data tables with instant interactive table view
100% client-side local browser execution — zero data sent to servers
RFC 4180 CSV Escaping & Delimiter Parsing Specification
Proper CSV-to-JSON conversion requires a state-machine parser (rather than naive `.split(',')`) to respect quoted fields containing embedded commas, line breaks, and escaped double quotes.
| Data Scenario | RFC 4180 CSV Representation | JSON Representation | Parser Behavior |
|---|---|---|---|
| Embedded Delimiter | "Seattle, WA" | "Seattle, WA" | Preserves comma inside quotes |
| Escaped Double Quote | "15"" MacBook Pro" | "15\" MacBook Pro" | Maps "" in CSV to \" in JSON |
| Multiline Cell Value | "Line 1\nLine 2" | "Line 1\nLine 2" | Retains CRLF/LF inside quoted token |
| European Excel CSV | 1250,50;USD;Active | {"amount":"1250,50"} | Use Semicolon (;) delimiter mode |
Frequently Asked Questions about CSV ↔ JSON
Why does splitting a CSV string with `.split(',')` fail on real-world data?
Naive string splitting breaks whenever a text field (such as an address or product description) contains a comma inside quotes (`"Austin, TX"`). Our RFC 4180 state-machine parser tracks quote states so embedded commas and newlines stay intact.
Why does Microsoft Excel in Europe export CSV files with semicolons (`;`) instead of commas?
In locales where the comma is the decimal separator (e.g., `19,99 €` in Germany, France, or Vietnam), Excel uses the semicolon (`;`) as the field delimiter. Select `Semicolon (;)` in the Delimiter dropdown to parse these files cleanly.
How are nested JSON objects handled when converting JSON to CSV?
Flat keys become top-level CSV column headers, while nested objects or arrays inside a record are stringified so the resulting CSV row maintains exact column alignment across all records.
Are my customer CSV spreadsheets or JSON dumps uploaded to any server?
No. 100% of the CSV tokenization and JSON serialization executes locally in your browser's JavaScript runtime.
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