How to Use
- 1 Paste your CSV data into the Input CSV panel, or click Upload CSV to load a .csv file directly from your device.
- 2 Make sure the first row contains column headers — these become the JSON object keys.
- 3 Click Convert to JSON to transform the CSV into a JSON array of objects.
- 4 Review the generated JSON in the JSON Output panel.
- 5 Click Copy to copy the JSON output to your clipboard.
- 6 Click Clear to reset both panels.
Frequently Asked Questions
Is my CSV data sent to a server?
No. All conversion happens entirely in your browser using JavaScript. Your CSV data never leaves your device and is never stored or logged anywhere.
Does the CSV need column headers?
Yes. The first row of your CSV is used as the property names (keys) in the JSON objects. Each subsequent row becomes a JSON object with those keys.
How are quoted fields handled?
The converter correctly handles RFC 4180 CSV quoting rules. Fields wrapped in double quotes are parsed correctly, including fields that contain commas, newlines, or escaped double quotes ("").
What delimiter does this tool support?
The tool uses comma (,) as the delimiter, which is the standard CSV format. For tab-separated values (TSV), you would need to preprocess the data.
What happens with empty cells?
Empty cells are converted to empty strings ("") in the JSON output. If you need null values instead, you can post-process the JSON.
Can I convert large CSV files?
Yes. The conversion runs in your browser and can handle reasonably large files. Performance depends on your device memory and browser. Very large files (100MB+) may be slow.
What does the output JSON look like?
The output is a JSON array of objects. Each object represents one CSV row, with keys from the header row and values from that row's cells. For example: [{"name":"Alice","age":"30"},{"name":"Bob","age":"25"}]
How are numbers and booleans handled?
All values are output as strings by default, matching the raw CSV content. If you need typed values (numbers, booleans), you can post-process the JSON or use a more advanced converter.