Convert CSV, semicolon-separated text or TSV into a JSON array of objects locally. Handle quoted multiline cells, preview the records and preserve every cell as a string.
First 30 data rows and 10 columns. The JSON output and download include all converted records.
Parsing and JSON generation happen entirely in your browser without uploads, accounts, dependencies or input storage. Values stay strings so numeric-looking IDs, leading zeros, date text and formula-like content are not silently changed or evaluated.
Comma, semicolon and tab delimiters are supported, with double-quoted fields, doubled internal quotes and quoted multiline content. Record separators may be CRLF, LF or CR. A quote must open at the start of a field, and a closing quote must be followed immediately by the delimiter, a record break or end of input. There is no delimiter guessing or Excel sep= directive handling. Select the correct delimiter explicitly.
With the header option on, the first retained record supplies property names. Names are preserved exactly, including surrounding spaces, but blank or whitespace-only names and exact duplicate names are rejected. Matching is case-sensitive. With the option off, all retained records are data, and keys are column_1, column_2 and so on. Every data row must have the same field count as the first retained record.
No. Every cell becomes a JSON string, including empty cells, numeric text, true, null and date-looking content. Large IDs and leading zeros stay intact. Formula-like text and apostrophe prefixes are retained without execution or removal. A cell containing JSON text remains a string; it is not expanded into a nested value.
Skip completely empty records removes only record breaks with no content between them. Records containing spaces, delimiters or quoted empty fields are retained. A final record terminator does not create an extra record. Empty cells become empty strings. A header-only input produces an empty JSON array; completely empty input gives an error.
A single BOM at the start is removed. Other spacing and cell text are preserved. Quoted cell line endings are retained by the parser, but browser textareas normalize pasted CRLF/CR to LF before conversion. JSON escaping preserves tabs, line breaks, quotes and surrogate units without evaluating content. Output member order follows source columns, including numeric-looking header names.
Input accepts 200,000 UTF-16 units, 5,000 data rows, 200 columns and 100,000 data cells. JSON output is limited to 2,000,000 units because long headers repeat in every object. Over-limit or malformed data gives no partial output. Preview shows 30 rows and 10 columns; exports include the entire result. Clear keeps options, Example restores defaults, and edits clear stale results. No text is uploaded or saved in browser storage.
