UtilityBaseDeveloper Tools
CSV to JSON Converter
Convert CSV to JSON and JSON back to CSV — quotes and commas handled properly.
Updated July 7, 2026
How to use the csv to json converter
- 1Paste CSV on the left or JSON on the right.
- 2Set the delimiter (comma, semicolon, or tab) and whether row one is headers.
- 3Click the direction you need — the other pane fills in.
- 4Copy the result or keep editing and re-convert.
Common uses
- Turning a Sheets/Excel export into JSON for a script or API call
- Converting an API response into CSV to open in a spreadsheet
- Reshaping sales or inventory exports between tools
- Inspecting a messy CSV's structure without importing it anywhere
Frequently asked questions
How are commas inside values handled?
Per the CSV standard (RFC 4180): fields containing commas, quotes, or newlines are wrapped in double quotes, and literal quotes double up (""). The parser honors all of it in both directions, which is where copy-paste regex converters fall apart.
What JSON shape does it produce?
With 'first row is headers' on, an array of objects — [{"name":"Jordan 4","price":"210"}] — which is what most APIs and scripts want. With it off, an array of arrays preserving raw rows.
Why are all my numbers strings in the JSON?
CSV has no types — everything is text, and guessing wrong (ZIP codes, order IDs with leading zeros, phone numbers) silently corrupts data. Values stay as strings; convert the columns you know are numeric in your own code.
What JSON can convert to CSV?
An array of flat objects (keys become the header row, unioned across objects) or an array of arrays. Nested objects don't map cleanly onto CSV's flat grid — flatten them first.
About this tool
The CSV to JSON converter transforms spreadsheet data into JSON and back, with a real parser that handles the cases naive split-on-comma approaches destroy: quoted fields, commas inside values, escaped quotes, and mixed line endings, per RFC 4180. With headers enabled, each CSV row becomes a JSON object keyed by column name — the shape APIs and scripts expect; without, you get an array of arrays. The reverse trip flattens an array of objects back into CSV with a unioned header row. Comma, semicolon, and tab delimiters cover exports from Excel, Sheets, and European locales. Everything converts locally — customer lists and sales exports never leave your machine.
Like everything on UtilityBase, the csv to json converter runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more developer tools here.
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