30 seconds of code

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

Use Array.prototype.join(delimiter) to combine all the names in columns to create the first row. Use Array.prototype.map() and Array.prototype.reduce() to create a row for each object, substituting non-existent values with empty strings and only mapping values in columns. Use Array.prototype.join('\n') to combine all rows into a string. Omit the third argument, delimiter, to use a default delimiter of ,.

const JSONtoCSV = (arr, columns, delimiter = ',') =>
    ...arr.map(obj =>
        (acc, key) => `${acc}${!acc.length ? '' : delimiter}"${!obj[key] ? '' : obj[key]}"`,