CSV to JSON
Convert CSV files to JSON format
About the CSV to JSON (Browser)
This tool converts CSV to JSON in your browser, so the file is never uploaded. Header names become object keys and numbers, booleans and nulls are typed — the same conversion as the server version, done locally.
Converting CSV to JSON in the browser matters when the file contains data you should not hand to a third party. Customer exports, payroll figures, medical records and anything covered by a data processing agreement all fall into that category.
The conversion itself is what you would expect: the first row supplies the object keys, each following row becomes an object, and numeric, boolean and empty values are typed rather than quoted as strings. Quoted fields containing commas and line breaks parse correctly.
The trade-off against the server version is scale. Very large files are limited by your device's memory, so a multi-hundred-megabyte export is better handled by the server-based converter. For anything of ordinary size, local is both faster and private.
How to use the CSV to JSON (Browser)
- Add your CSV. Paste the data or select a file — it stays on your machine.
- Convert locally. The parse and conversion run in your browser.
- Check the typing. Confirm numbers and booleans were detected as you expect.
- Copy or download. Take the JSON output.
CSV to JSON (Browser) features
- Conversion entirely in your browser
- Header row becomes object keys
- Number, boolean and null type detection
- Handles quoted fields with commas and newlines
- Suitable for data covered by a processing agreement
- No account or upload required
Frequently asked questions
Is the file uploaded anywhere?
No. Parsing and conversion happen entirely in your browser, so the data never leaves your machine.
Why use this instead of the server converter?
Because the file contains data you should not send to a third party — customer records, payroll, anything under a processing agreement.
Is there a size limit?
Only your device's memory. Very large exports are better handled by the server-based converter.
Are values typed automatically?
Yes. Numbers, booleans and empty cells become numbers, booleans and nulls rather than strings.
Does it handle commas inside values?
Yes, provided the field is quoted as the CSV convention requires.