CSV to JSON
Paste or drop a CSV — get clean JSON with real numbers and booleans, and nested objects from dot-named columns.
CSV
JSON
Frequently asked questions
Will zip codes like 007 or long phone numbers break?+
No. Values with leading zeros and numbers longer than 15 digits stay as text; only real quantities become numbers.
Can it create nested JSON?+
Yes. Columns named like user.name or tags.0 are turned into nested objects and arrays. Switch it off for flat objects.
Which delimiters are supported?+
Comma, semicolon, tab and pipe are detected automatically — or choose one yourself.
What about empty cells?+
Choose whether empty cells become null, an empty string, or are left out of the object.
Is my data uploaded?+
No. Everything runs in your browser.