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CSV ↔ JSON Converter
Convert CSV data to JSON or JSON arrays to CSV locally in your browser.
Same data. Different format.Browser processing
Converted data will appear here.
How to use it
From input to insight.
Choose the source format, paste your data, and convert. When opening converted CSV in a spreadsheet, import it as text if you need to preserve leading zeros or values that start with formula characters.
What to know
CSV requires a header row with unique, nonempty column names. Quoted commas, escaped quotes, and multiline fields are supported. CSV values remain strings. JSON must be an array of flat objects; all keys are included, and missing values or nulls become empty CSV cells. Maximum input: 1 MB.