CSV to JSON / CSV to JSONL / CSV to NDJSON converter / TSV to JSON / spreadsheet to JSON / data pipeline preprocessor / LLM training-data prep. RFC 4180 parser. Type inference (booleans, integers, floats, ISO dates, null tokens). Configurable delimiter, quote char, header presence, column rename, drop columns, trim whitespace. Outputs newline-delimited JSON (jsonl), a JSON array (json), or column-oriented arrays (ndarray). Pure parser, no upstream API.

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