CSV to JSON Converter
Paste CSV or upload a file to convert it to a clean JSON array. Pick the delimiter and header option, then copy or download the result. Everything runs in your browser.
About the CSV to JSON Converter
The CSV to JSON Converter turns CSV text into a JSON array you can paste into code, configs, or API requests. Paste rows or upload a file, pick a delimiter, and choose whether the first row holds column names. With the header toggle on you get an array of objects keyed by column name; with it off you get an array of arrays. Everything runs in your browser, so your data is never uploaded.
How it works
- Paste CSV into the input box or upload a .csv file.
- Pick the delimiter (comma, semicolon, or tab) and toggle whether the first row is a header.
- Read the JSON output along with the row and column counts; a malformed row shows an inline error.
- Click Copy to grab the JSON, or Download to save it as a .json file.
Features
- Convert to an array of objects (header on) or an array of arrays (header off).
- Delimiter choice: comma, semicolon, or tab.
- A parser that handles quoted fields, commas inside quotes, and escaped double quotes.
- Row and column counts, plus an inline error when a row has a mismatched field count.
- Copy to clipboard and download the result as a .json file.
Frequently asked questions
Is my data uploaded anywhere?
No. The CSV is parsed and converted entirely in your browser. Nothing is sent to a server or logged, including files you upload.
What is the difference between the header on and off modes?
With the header toggle on, the first row supplies the keys and each later row becomes an object. With it off, every row becomes an array of its cell values, including the first row.
How are quoted fields handled?
Fields wrapped in double quotes can contain the delimiter and line breaks. A doubled double quote inside a quoted field is read as a single quote character, following the common CSV convention.
Why do I see a column count error?
When the header is on, every data row must have the same number of fields as the header row. The error names the first row where the count does not match so you can fix it.
Which delimiters are supported?
Comma, semicolon, and tab. Pick the one your file uses from the delimiter menu. Tab is common in spreadsheet exports saved as TSV.