CSV to JSON
JavaScript, String, Object · Jan 30, 2022
Converts a comma-separated values (CSV) string to a 2D array of objects. The first row of the string is used as the title row.
- Use
Array.prototype.indexOf()to find the first newline character (\n). - Use
Array.prototype.slice()to remove the first row (title row) andString.prototype.split()to separate it into values, using the provideddelimiter. - Use
String.prototype.split()to create a string for each row. - Use
String.prototype.split()to separate the values in each row, using the provideddelimiter. - Use
Array.prototype.reduce()to create an object for each row's values, with the keys parsed from the title row. - Omit the second argument,
delimiter, to use a default delimiter of,.
const CSVToJSON = (data, delimiter = ',') => {
const titles = data.slice(0, data.indexOf('\n')).split(delimiter);
return data
.slice(data.indexOf('\n') + 1)
.split('\n')
.map(v => {
const values = v.split(delimiter);
return titles.reduce(
(obj, title, index) => ((obj[title] = values[index]), obj),
{}
);
});
};CSVToJSON('col1,col2\na,b\nc,d');
// [{'col1': 'a', 'col2': 'b'}, {'col1': 'c', 'col2': 'd'}];
CSVToJSON('col1;col2\na;b\nc;d', ';');
// [{'col1': 'a', 'col2': 'b'}, {'col1': 'c', 'col2': 'd'}];
