Convert JSON to CSV

Giovanny Gongora

Converts an array of objects to a comma-separated values (CSV) string that contains only the columns specified.

const JSONtoCSV = (arr: Array<object>, columns: string[], delimiter = ',') =>
  [
    columns.join(delimiter),
    ...arr.map(obj =>
      columns.reduce(
        (acc, key) =>
          `${acc}${!acc.length ? '' : delimiter}"${!obj[key] ? '' : obj[key]}"`,
        ''
      )
    ),
  ].join('\n');