JSON to CSV Converter
Paste JSON or upload a .json file and convert it to CSV instantly. Handles nested objects, custom delimiters, and files up to 200 MB — all in your browser.
No output yet
Enter JSON data and click Convert to see the CSV result here.
Conversion Settings
How to Use
Add your JSON
Paste a JSON array or upload a .json file. Click "Load sample" to try it instantly.
Adjust settings
Choose your delimiter, enable nested flattening, and toggle headers if needed.
Convert & export
Click Convert, then copy the CSV to clipboard or download it as converted.csv.
Frequently Asked Questions
JSON (JavaScript Object Notation) is a lightweight data-interchange format used for APIs and modern web applications. It uses key-value pairs and arrays.
CSV (Comma-Separated Values) is a plain-text format for tabular data. Each line is a row, and each field is separated by a delimiter (usually a comma). It is widely used for spreadsheets and databases.
No. This JSON to CSV converter runs entirely in your browser. Your data is never sent to a server, stored, or shared. There is no backend, no API calls, and no tracking of your input.
This converter handles JSON files up to 200 MB and beyond, even on modest hardware. It uses a Web Worker to process files in a separate thread, so the UI stays smooth and responsive — no freezing, even on very large files.
When "Flatten nested objects" is enabled, nested keys are joined with dots. For example, { user: { name: "Ali" } } becomes the CSV column "user.name" with value "Ali".
