CSV to JSON Converter
Convert common CSV text into a JSON array of objects in your browser, with explicit handling for headers, quoted commas, and blank rows.
Paste CSV text, choose the delimiter behavior, and generate JSON locally. The first row becomes object keys, values stay as strings, and the parser handles common quoted fields. It is not a full spreadsheet engine and does not evaluate formulas or workbook files.
Browser-local processing
CSV to JSON Converter
How to use
Finish in three steps
- 01
Paste plain CSV text with a header row. Use quotes around fields that contain commas, line breaks, or double quotes.
- 02
Choose auto detection or a fixed comma, semicolon, or tab delimiter, then decide whether the output should be pretty or compact.
- 03
Convert, review the row count and generated keys, then copy the JSON only after checking it against your import or API schema.
What this converter supports
The parser supports common CSV text with a header row, quoted fields, escaped double quotes, comma, semicolon, and tab delimiters. Empty headers are renamed to column_1 style keys, and repeated headers receive numeric suffixes.
What it intentionally does not do
It does not read XLSX files, evaluate spreadsheet formulas, infer numbers or dates, validate a target API schema, merge cells, preserve formatting, or stream very large files. Values are kept as strings so the conversion stays reviewable.
Review before importing JSON
Check that the delimiter was detected correctly, row counts match the source, headers are stable field names, and extra columns have not appeared from an unquoted comma. For production imports, validate the output against the destination system.
FAQ
About this tool
Does this CSV to JSON tool upload my data?
No. The conversion runs in the browser. You should still avoid pasting confidential exports, customer records, access tokens, or regulated data into pages you do not trust.
Does it convert numbers and dates into JSON numbers or dates?
No. Values stay as strings. That avoids accidental changes to IDs, leading zeros, dates, ZIP codes, and values that look numeric but are identifiers.
Can I paste spreadsheet files directly?
No. Export or copy plain CSV text first. The tool does not parse XLSX workbooks, formulas, cell styles, merged cells, or multiple sheets.
What happens when a row has more cells than the header row?
The converter keeps the extra values under extra_1, extra_2, and similar keys so the data is visible instead of silently discarded.
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