Convert CSV to JSON — Auto Delimiter, Smart Types

CSV is the universal export format — every spreadsheet, BI tool, ad platform and SQL client can produce one. But the moment you want to feed that data into a JavaScript app, a REST API, or a NoSQL database, you need JSON. Our CSV to JSON converter turns any RFC 4180-compliant CSV into a clean, typed JSON array right in your browser.

The parser handles the tricky parts you'd otherwise have to write yourself. **Quoted fields** containing commas, newlines or double quotes are parsed correctly (with `""` escaping the inner quote). **Auto-delimiter detection** picks the most likely separator from the header row, so semicolon-CSVs from European Excel just work without changing settings. **Type coercion** converts strings like `42`, `true`, `null` and `-3.14` to their real JSON types — toggle off if you want raw strings.

For deeply structured data, **dot-notation unflatten** turns column headers like `address.city` into nested objects (`{address: {city: "..."}}`), the perfect mirror of our JSON-to-CSV flatten option. Disable headers if your first row is data, and pick between pretty-printed JSON for reading or compact JSON for production payloads.

Loading data is flexible: paste CSV directly, upload a `.csv` or `.tsv` file, or fetch from a URL — handy for transforming a public dataset on the fly. Everything runs locally in your browser; your CSV is never uploaded to a server, which matters when your file contains customer data, financial records or anything else you can't send through a third party.