How to Convert CSV to JSON (Free, in Your Browser)

CSV is great for spreadsheets, but code and APIs usually want JSON. Converting is quick and, with a browser-based tool, completely private.

Convert CSV to JSON in 3 steps

With a header row, each column header becomes a key and each row becomes an object:

name,age
Kim,30

becomes

[{ "name": "Kim", "age": "30" }]

Inspect first. Use the CSV Viewer to confirm columns are parsed correctly, especially with commas inside quoted fields.
Tidy the JSON. Run the result through the JSON Formatter to validate and beautify it.
Need the reverse? Use JSON to CSV.

Does the first row become keys? Yes, when the header option is on. Otherwise rows become arrays of values.

Are my files uploaded? No. Conversion happens entirely in your browser.

Commas inside a field split it into extra columns. A value like Smith, John must be wrapped in double quotes ("Smith, John") in the source CSV, or the parser reads the comma as a delimiter. Check the row count in the CSV Viewer first.
Every number became a string. CSV has no types, so "age": "30" is expected. If your code needs real numbers, cast them after parsing — the converter can't safely guess which text columns are numeric.
The first data row is missing. That means the header option is off and your first line of real data was consumed as keys, or it's on and you have no header row. Toggle the setting to match your file.
Garbled accented characters. Save the source as UTF-8; CSVs exported from older spreadsheet software are sometimes Latin-1, which mangles non-ASCII text.