How are headers handled?

The first row is treated as the header and becomes the JSON object keys; every following row becomes an object in the output array.

What about commas inside my data?

Fields wrapped in double quotes are handled per the CSV standard, including escaped quotes and embedded commas and newlines.

Yes — a flat array of objects (the default) or nested output. Numbers and booleans are auto-detected; you can force everything to strings.

The practical limit is your browser's memory — files up to several megabytes convert comfortably since everything runs locally.

Convert CSV data to JSON format instantly. Perfect for data migration and API prep.

CSV Input

JSON Output

1Paste your CSV data or upload a .csv file — the header row is detected automatically.
2Review the parsed column names and fix the delimiter if needed (comma, semicolon or tab).
3The JSON output updates live — choose between an array of objects or a nested structure.
4Copy or download the formatted JSON for use in your app or API mock.

Useful Tools

Other free online tools you might find handy.

Paste JSON, get TypeScript interfaces instantly. Handles nested objects, arrays, optional fields. Free, no signup.

AND, OR, XOR, NOT, left shift, right shift on binary, octal, decimal, hex. Free, no signup, perfect for programmers.

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