Converts a CSV string to JSON. Only works for well behaved CSV datasets without crazy string escaping or similar shenanigans.

csv-to-json.js

function csvToJson(csv, columnSeparator = ',', rowSeparator = '\n') {
  const inferType = (str) => {
    if (!str) {
      return;
    } else if (!isNaN(str) || !isNaN(str.replace(',', '.'))) {
      return parseFloat(str.replace(',', '.'));
    } else if (Date.parse(str.replace(/"/g, ''))) {
      return new Date(str.replace(/"/g, ''));
    } else {
      return str.replace(/"/g, '');
    }
  };
  const [firstLine, ...lines] = csv.split(rowSeparator)
    .filter(line => line.length);

  return lines.map(line =>
    firstLine.split(columnSeparator).reduce(
      (curr, next, index) => {
        return {
          ...curr,
          [next]: inferType(line.split(columnSeparator)[index])
        };
      },
      {}
    )
  );
}