Convert CSV to JSON Online
How do you convert CSV to JSON? Drop your CSV below and click Convert. Each row becomes a JSON object with the column headers as keys. You can also convert JSON back to CSV. Free, no signup, and your data never leaves your device.
Drop your CSV file here or click to browse
Processed locally — never uploaded
How the conversion works
- Choose a direction. CSV → JSON or JSON → CSV.
- Add your file. For CSV → JSON the first row is used as headers. For JSON → CSV the file must contain an array of objects.
- Click Convert and download the result. CSV → JSON produces a pretty-printed array of objects; JSON → CSV produces a standard comma-separated file with a header row.
Frequently asked questions
How do I convert a CSV file to JSON?
Drop your CSV into the tool above and click Convert. You get a pretty-printed JSON array of objects, where each row becomes an object keyed by the column headers. The conversion runs locally in your browser.
Can I convert JSON back to CSV?
Yes. Switch the direction to "JSON to CSV" and drop a JSON file containing an array of objects. Keys become column headers and each object becomes a row.
What JSON format does the converter output?
A pretty-printed array of objects, the format expected by most APIs, databases and JavaScript applications. Column headers become object keys.
Does the converter work with large files?
Yes. Parsing runs in a background worker, so large files convert without freezing the page. Very large outputs are limited mainly by your device memory.
Is my data uploaded anywhere?
No. The conversion happens entirely in your browser. Files never leave your device.