Spreadsheets export CSV, but code prefers JSON. Converting between the two is a constant small chore — here's the quick way, in both directions, without uploading your data.
CSV to JSON
- Paste your CSV (with headers in the first row) into CSV to JSON.
- The header row becomes the object keys, and each following row becomes an object.
- Copy the JSON array.
This is what you want when feeding spreadsheet data into an app, seeding a database, or calling an API.
JSON to CSV
Going the other way, JSON to CSV flattens an array of objects into rows and columns you can open in Excel or Sheets — handy for sharing data with people who don't use JSON.
What to watch out for
- Headers matter: CSV to JSON uses the first row as keys, so make sure it's clean.
- Quoted commas: values containing commas need to be quoted in CSV; standard quoting is handled.
- Nested data: CSV is flat by nature, so deeply nested JSON doesn't map neatly to columns. Flatten it first if needed.
Both conversions run entirely in your browser, so even sensitive datasets stay on your device.