How do I convert CSV to JSON?

Paste your CSV data into the input area or upload a .csv file. The first row is used as the JSON key names by default. The JSON output appears instantly.

What delimiters are supported?

Comma, semicolon, tab, and pipe (|). The tool also has an auto-detect option that identifies the most likely delimiter from your data.

What if my CSV does not have a header row?

Toggle "First row is header" off. The tool will use col_1, col_2, etc. as the JSON keys instead.

Can I handle quoted fields with commas inside them?

Yes — the parser correctly handles RFC 4180 CSV format, including fields wrapped in double quotes that contain commas, newlines, or quotes themselves.

Is there a file size limit?

No server-side limit exists since all parsing runs in your browser. Very large files (tens of MB) may be slow to process depending on your device.

CSV to JSON

Convert CSV data to JSON format with automatic delimiter detection and header support. Paste CSV or upload a file.

Your files never leave your device

First row is header

CSV Input

How to CSV to JSON

Paste your CSV data into the input area or upload a .csv file.
Select the delimiter (comma, semicolon, tab, pipe) or use Auto-detect.
Toggle "First row is header" to use column names as JSON keys.
The JSON output appears instantly. Copy or download as .json.

Why Use This Tool?

CSV is ubiquitous in spreadsheets and data exports, but APIs and modern applications work with JSON. This converter handles quoted fields, mixed delimiters, and nested data, running entirely in your browser with no file uploads.

CSV to JSON

How to CSV to JSON

Why Use This Tool?

Frequently Asked Questions