Free converter
CSV to JSON
Turn a CSV file into a JSON array of objects, using the header row as the keys. Ideal for data you would rather not paste into an online tool. Because the conversion runs in your browser rather than on a server, your file is never uploaded, never stored and never seen by anyone else.
Drop your file to start.
The converter needs JavaScript, because the conversion itself runs on your own device rather than on a server. Enable JavaScript to load it.
How the mapping works
The first row is treated as the header and supplies the keys. Each subsequent row becomes one object in the output array, and empty lines are skipped. Parsing is handled by PapaParse, so quoted fields, embedded commas and escaped quotes are handled correctly.
Why do it locally
CSV exports tend to contain exactly the data you should not paste into a random website: customer records, financial rows, internal reports. Converting in your own browser means the file is never transmitted.
How it works
- 1
Add your file
Drag it onto the drop zone, click to browse, or paste from the clipboard.
- 2
Confirm the format
JSON is already selected. Open Settings if you want to adjust quality or size.
- 3
Download
Press Convert and save the result. Your file never leaves your device.
Frequently asked questions
Does the header row become the keys?
Yes. The first row supplies the object keys, and each following row becomes one object in the array.
Are quoted fields and embedded commas handled?
Yes. Parsing follows the CSV conventions, so quoted fields containing commas, newlines and escaped quotes are read correctly.
Are numbers converted to numeric types?
Values are kept as strings so that identifiers with leading zeros, such as postcodes, are not corrupted. Cast them afterwards if you need numbers.
Is there a row limit?
No fixed limit. Very large files are constrained only by your device's available memory.