CSV to JSON Converter
Convert CSV files into JSON arrays instantly, right in your browser.
This tool runs entirely in your browser. Your files are never uploaded to a server.
What this converter does
Turns comma-separated text into a formatted JSON array. The first non-empty CSV line supplies the property names, and every following non-empty line becomes one object whose values remain strings.
How to use it
Paste CSV text into the editor. The JSON preview updates immediately; after checking it, use the copy button to move the result into your application or save it with your own editor. This interface does not upload or download files.
Worked example
For `name,age` followed by `Ada,36`, the result is an array containing `{ "name": "Ada", "age": "36" }`. The number-looking value stays the JSON string `"36"`; type inference is not performed.
CSV parsing rules
The comma is the only delimiter. Double-quoted cells may contain commas, and doubled quotes inside a quoted cell become one quote. Missing cells become empty strings, while cells beyond the header count are ignored.
Structure limitations
The parser reads physical lines before parsing fields, so quoted multiline cells are not supported. It does not detect every malformed quote, trim headers, handle semicolon or tab delimiters, or preserve duplicate header columns: a later duplicate key overwrites the earlier value.
Check before using the JSON
The output is syntactically valid JSON, but it cannot validate a schema, infer booleans, numbers, dates, or nulls, or decide whether the source rows are complete. Review field names, row counts, and data types before importing it.
Privacy
Conversion runs locally in the browser and Quiklio does not send the pasted CSV to a server. Clipboard history, browser extensions, screenshots, and the device can still expose data, so use sanitized samples for sensitive records.
Frequently Asked Questions
- Are CSV values converted to JSON numbers or booleans?
- No. Every parsed cell is emitted as a JSON string, including values such as 36, true, and null. Convert types separately if your destination schema requires them.
- Can it parse quoted commas or multiline fields?
- A cell enclosed in double quotes may contain commas, and doubled quotes are unescaped. Quoted line breaks are not supported because the input is split into physical lines first.
- Can I upload or download a file here?
- No. This interface accepts pasted CSV text and provides a button to copy the JSON preview. Processing stays in your browser, but you must open and save files with your own tools.