About CSV to JSON Converter

Converts CSV data to JSON with configurable parsing options. Handles comma, semicolon, tab, and pipe delimiters. Supports quoted fields with escaped quotes, optional headers, whitespace trimming, and empty line skipping. Output in pretty-printed, compact, or array-of-arrays format.

• Custom CSV parser handles quoted fields, escaped quotes (doubled quote characters), and mixed delimiters
• Four delimiter options: comma, semicolon, tab, pipe
• Three output formats: pretty JSON (indented), compact JSON (single line), array of arrays
• Toggle first-row-as-header; without headers, columns auto-name as column_1, column_2, etc.
• Advanced options: trim whitespace, skip empty lines, custom quote character
• Upload .csv or .txt files, or paste data directly; four sample datasets included
• Reports row count, column count, headers, and per-row errors for mismatched field counts

Frequently Asked Questions

What happens with rows that have more or fewer columns than the header?

They’re flagged as errors and skipped. The tool reports exactly which row had the mismatch and how many fields were expected vs. found. Only clean rows appear in the JSON output.

Can this handle very large CSV files?

It runs entirely in the browser, so performance depends on your device. Files under a few MB convert instantly. For files over 10MB, you may see a brief pause. There’s no hard size limit, but the browser’s memory is the practical ceiling.