CSV to JSON Converter
Paste CSV text or upload a .csv file and convert it to JSON instantly. Handles quoted fields, custom delimiters, type detection, and files up to 200 MB — all in your browser.
No output yet
Enter CSV data and click Convert to see the JSON result here.
Conversion Settings
How to Use
Add your CSV
Paste CSV text directly or upload a .csv file. Click "Load sample" to try it instantly.
Adjust settings
Choose your delimiter, toggle headers, and enable type detection if needed.
Convert & export
Click Convert, then copy the JSON to clipboard or download it as converted.json.
Frequently Asked Questions
CSV (Comma-Separated Values) is a plain-text format for storing tabular data. Each line is a row, and each field is separated by a delimiter (usually a comma). It is widely used for data export, spreadsheets, and databases.
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and machines to parse. It uses key-value pairs and arrays, making it the standard format for APIs and modern web applications.
No. This CSV to JSON 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 CSV 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 "First row is headers" is enabled, the first row of your CSV becomes the JSON object keys. Empty header cells are replaced with column_1, column_2, etc. Duplicate headers get a suffix (_2, _3) to keep keys unique.
