CSV to JSON converter

Convert CSV with a header row to JSON, or JSON objects to CSV.

Your files and text stay in your browser. Processors may download on first use.

How to use CSV to JSON converter

CSV headers must be unique and non-empty. CSV fields stay strings; JSON nested objects and arrays are serialized in CSV cells.

A practical example

For CSV to JSON, use a header row with unique column names. Quoted commas and multiline fields are supported. For JSON to CSV, provide an array of objects; nested values become JSON text inside cells.

Are numbers and formulas preserved when I convert CSV?

CSV values become strings in JSON because CSV has no reliable type information. CSV exports prefix formula-like values with an apostrophe for spreadsheet safety. Review types and formatting before importing into another system.

What happens to my input?

Files and text are processed on your device. Tool usage can be counted under the site’s existing analytics settings, but this tool does not send your file, text, filename or generated content to analytics.

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