DevFmt/

CSV to JSON

Input — CSV
Output — JSON

How to use CSV to JSON

CSV to JSON Converter transforms CSV data into a JSON array of objects. Paste comma-separated, tab-separated, or semicolon-separated data and get properly structured JSON output.

The converter uses the first row as headers by default, creating JSON objects with those keys. Toggle "Header Row" off if your CSV doesn't have headers — the output becomes an array of arrays instead.

Key features: automatic delimiter detection, type inference (numbers and booleans), header row toggle, file upload support, and real-time conversion with row/column counts in the status bar.

Type inference is enabled by default: numeric strings become JSON numbers, and "true"/"false" become JSON booleans. Disable it if you need all values as strings.

All processing runs entirely in your browser using PapaParse — no data is sent to any server.

FAQ

How do I convert CSV to JSON?
Paste your CSV data into the input panel. DevFmt auto-detects the delimiter and converts each row to a JSON object using the header row as keys. The output is a JSON array of objects.
Does it auto-detect data types?
Yes. With 'Infer Types' enabled (default), numbers become JSON numbers and 'true'/'false' become JSON booleans. Toggle it off to keep everything as strings.
What if my CSV doesn't have a header row?
Toggle off 'Header Row' in the toolbar. The output will be a JSON array of arrays instead of objects.
What delimiters are supported?
The parser auto-detects commas, tabs, semicolons, and pipes. No manual configuration needed in most cases.

Related tools

/json/to-csv/csv/formatter/json/formatter

We use cookies for anonymous analytics and ads. Your tool data never leaves your browser.