CSV to JSON converter
Paste CSV or open a .csv file to get a JSON array of objects, one per row, using the header row as keys. The delimiter is detected automatically and quoted fields with commas or line breaks are handled.
- ๐ Runs on your device
- โค 0 bytes uploaded
- ๐ด Works offline
- โ Free, no sign-up, no watermark
How to use CSV to JSON
- Paste CSV or open a .csv file.
- Check the delimiter and header options.
- Choose an array of objects or an array of arrays.
- Copy or download the JSON.
About CSV to JSON
Parsing uses Papa Parse, a widely used open-source CSV parser, running entirely in your browser.
Is it private?
Yes. CSV to JSON runs entirely in your web browser. What you type is never sent to Nolo or anyone else, and the page cannot send it anywhere: its security policy only allows it to talk to nolotools.com, which has no place to receive data. Nothing is stored either: close the page and it is gone. How Nolo works.
Questions and answers
Is my CSV sent to a server?
No. Everything runs in your browser and your CSV never leaves your device. The page is not allowed to talk to any other site, so it is safe to use with real data and secrets.
Are numbers converted?
With "Convert numbers and true/false" on, values like 42, -3.5 and 1e3 become JSON numbers written exactly as in the CSV (no rounding), and true/false become booleans. Values with leading zeros, such as ZIP codes like 01234, stay text.
Which delimiters are supported?
Comma, semicolon, tab and pipe, detected automatically or chosen by hand. Quoted fields may contain the delimiter, quotes ("") and line breaks, as in RFC 4180.
What happens with duplicate column names?
They get a suffix (name, name_2) so no value is lost. Empty headers become column1, column2โฆ
How do I convert an Excel file?
In Excel or Google Sheets choose File โบ Save as / Download โบ CSV, then open that file here.