A CSV to JSON converter is a free online tool that turns spreadsheet-style comma-separated data into a JSON array of objects. It correctly handles quoted fields containing commas, lets you choose whether the first row is headers, and outputs pretty or minified JSON you can copy or download.
How do I convert CSV to JSON online?
Paste your CSV or upload a .csv file, keep "First row is headers" ticked if your data has a header row, choose pretty or minified output, and press Convert. The JSON array appears instantly, ready to copy or download as a .json file.
The parser follows real CSV rules: fields wrapped in double quotes may contain commas, line breaks, and escaped quotes (""), so messy spreadsheet exports convert correctly instead of splitting rows in the wrong places.
What if my CSV has no header row?
Untick "First row is headers" and the tool will treat every row as data, generating column names like col1, col2, col3. Your values are preserved exactly as written.
When headers exist, they become the JSON keys, cleaned of surrounding whitespace. Duplicate or empty header names get a numeric suffix so every key stays unique and valid.
Frequently asked questions
Is this CSV to JSON converter free?
Yes. Convert unlimited CSV data with no account and no limits. It runs entirely in your browser.
Does it handle commas inside quoted fields?
Yes. Proper CSV quoting is supported: "Doe, John" stays one field, and "" inside a quoted field becomes a single quote character.
Can I upload a CSV file instead of pasting?
Yes. Use the upload button to read a .csv file from your device. The file is read locally and never uploaded anywhere.
What JSON structure is produced?
An array of objects, one per data row. With headers on, keys come from the first row; otherwise keys are col1, col2, and so on.
Is my data uploaded anywhere?
No. Parsing and conversion happen locally in your browser, including uploaded files.