CSV ↔ JSON Converter
Two-way conversion between CSV and JSON.
Converted output and a table preview appear here.
About the CSV ↔ JSON Converter
The Freemium.Tools CSV and JSON converter transforms CSV into JSON and JSON back into CSV in your browser, handling headers, quoted fields and nested keys.
Spreadsheets speak CSV and APIs speak JSON, so moving between the two is a constant chore. This converter goes both ways and keeps quoting and header rows intact.
Everything runs locally, which makes it safe for exports that contain customer records.
How to use it
- 1Paste or upload your data. Provide CSV or JSON as the input.
- 2Pick the direction. Convert CSV to JSON, or JSON to CSV.
- 3Copy or download. Take the converted output into your spreadsheet or code.
Frequently asked questions
Does it handle commas inside values?
Yes. Quoted fields are parsed correctly, so values containing commas, quotes or line breaks survive the conversion.
What happens to nested JSON when converting to CSV?
Nested objects are flattened into dotted column names so the structure is still readable in a spreadsheet.
Is the first CSV row treated as headers?
Yes. The header row becomes the keys of each JSON object.
Is my data uploaded?
No. The conversion runs entirely in your browser.
Is it free?
Yes, with no sign-up required.