Convert CSV text to JSON and JSON rows back to CSV. RFC 4180 parsing (quoted fields, escaped quotes, embedded newlines), automatic delimiter detection (comma/semicolon/tab/pipe), and type coercion (numbers, booleans, nulls). Built for agents moving data between tabular and structured forms. POST a JSON body like: {"csv":"name,age,active\nAda,36,true\nBob,29,false"}