Is my CSV data uploaded to a server?

No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

Are quoted fields with commas or line breaks supported?

Yes. The parser follows the CSV standard (RFC 4180): quoted fields, escaped quotes, commas and line breaks inside values are all handled correctly.

Are numbers and booleans converted automatically?

Yes. Values that look like numbers or booleans are typed accordingly in the JSON output, so "42" becomes 42 and "true" becomes true.

CSV to JSON Converter — Free Online Tool

Convert CSV to JSON instantly in your browser. Free, private and offline-friendly: your spreadsheet data never leaves your device.

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Indentation

Delimiter

Swap: JSON → CSV

CSV input

JSON output

Why convert CSV to JSON?

CSV is how spreadsheets and databases export data, but APIs, config files and most programming tools expect JSON. Paste a CSV export above — the first row is used as headers — and get an array of JSON objects ready to use in your code.

How it works

The converter parses your CSV locally following the RFC 4180 rules: quoted fields, escaped quotes and multiline values are handled correctly. Numbers and booleans are detected automatically, and empty lines are skipped.

Frequently asked questions

Is my CSV data uploaded to a server?: No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
Are quoted fields with commas or line breaks supported?: Yes. The parser follows the CSV standard (RFC 4180): quoted fields, escaped quotes, commas and line breaks inside values are all handled correctly.
Are numbers and booleans converted automatically?: Yes. Values that look like numbers or booleans are typed accordingly in the JSON output, so "42" becomes 42 and "true" becomes true.