Convert CSV files to JSON instantly
Drop CSV file here
or click to select
QRSwift's CSV to JSON Converter takes tabular data — either pasted directly or uploaded as a .csv file — and transforms it into a clean, properly structured JSON array where each row becomes an object keyed by the header row. It's built for developers feeding spreadsheet exports into APIs, data engineers reshaping datasets, and analysts who need a quick format switch without writing a script. The conversion happens entirely in your browser, so no data ever leaves your machine.
Add your CSV data
Either drag and drop a .csv file onto the upload zone, click to browse for one, or paste raw CSV text directly into the left input panel.
Make sure the first row is your header
The converter treats the first row as column names and uses them as the keys in each JSON object. A CSV without a header row will produce objects with the first data row used as keys.
Click Convert
Hit Convert CSV to JSON and the formatted JSON array appears instantly in the right panel. Uploading a file triggers conversion automatically.
Copy and use your JSON
Click Copy JSON to send the output to your clipboard, then paste it into your codebase, API client, or JSON formatter.
Each row becomes a JSON object, and the entire file becomes an array of those objects. For example, a CSV with columns name,age,city and a data row John,30,New York produces [{"name":"John","age":"30","city":"New York"}]. All values are output as strings — if you need numbers or booleans, you'll want to post-process the JSON in your code.
The current parser splits on every comma, so fields that contain commas (usually wrapped in quotes in standard CSV, e.g. "Smith, John") will be split incorrectly. For simple CSVs exported from Excel or Google Sheets without quoted fields, the conversion works perfectly. If your data has quoted commas, consider using a dedicated library like PapaParse in your own project for full RFC 4180 compliance.
Use the file upload feature — click the drop zone and select your .csv file directly from your computer. The file is read by your browser's FileReader API and converted entirely in memory, so there's no upload size limit imposed by a server. For very large files (tens of thousands of rows), conversion may take a second or two depending on your device, but no data is transmitted anywhere.