How to Convert CSV to JSON (Spreadsheet Data to API Format)
CSV is great for spreadsheets but awkward for code; JSON is the opposite. Converting CSV to JSON lets you feed spreadsheet data straight into APIs, config, and apps. Kitolity converts it in your browser — your data is never uploaded.
The tool
CSV to JSON Converter
Step by step
- Open the CSV to JSON toolGo to the CSV to JSON Converter — it runs entirely in your browser.
- Paste your CSVPaste your comma-separated rows, including the header row.
- ConvertThe first row becomes the JSON keys, and each following row becomes an object.
- Copy the JSONCopy the result — nothing you paste ever leaves your device.
How do headers map to JSON?
The header row defines the field names. Each data row is turned into a JSON object whose keys are those headers and whose values are the cells in that row. So a CSV with columns name,email becomes an array of { "name": ..., "email": ... } objects — ready to drop into an API or app.
What about commas inside values?
Standard CSV wraps values that contain commas in double quotes, and the converter respects that, so an address like "123 Main St, Apt 4" stays a single value rather than splitting into two columns.
Frequently asked questions
Is my data uploaded?
No — conversion runs entirely in your browser, so your data stays on your device.
Does the header row become the keys?
Yes — the first row defines the JSON field names and each following row becomes an object.
Is it free?
Yes, completely free with no sign-up.