Private by design: the input stays in this browser and is not uploaded to our server.
Maximum 10 MB · processed locally
Ready. Paste input, open a file or use the example.
About this tool
Convert CSV to JSON safely and quickly.
Turn spreadsheet exports and comma-separated records into JSON arrays for APIs, test fixtures and data pipelines.
What it handles
- Handles quoted fields, commas and line breaks
- Detects comma, tab, semicolon and pipe delimiters
- Optional number, boolean and null type conversion
- Copy or download the converted JSON
Common questions
CSV to JSON Converter FAQ
Does this CSV to JSON converter upload my file?
No. Conversion runs locally in your browser, so the input is not sent to Data & AI Lab.
Does it support quoted commas?
Yes. The parser supports quoted fields, escaped double quotes and line breaks inside quoted values.
How are CSV headers used?
The first row becomes the JSON property names. Duplicate or empty headers are automatically made unique.