Simple JavaScript to convert JSON to CSV

json-to-csv

function JSONToCSV(data) {
	if (typeof(data) != 'object') {
		if (typeof(data) != 'string') {
			console.error('Error: data is not a JavaScript object or a string');
			return null;
		}

		try {
			data = JSON.parse(data);
		} catch (error) {
			console.error('Error: ' + error);
			return null;
		}
	}

	// Check whether the data is not an array
	if (!(data.hasOwnProperty('length') && typeof(data.length) == 'number')) {
		console.error('Error: data is not an array');
		return null;
	}

	// Check whether the data has any elements in it
	if (data.length == 0) {
		console.error('Error: data has zero elements');
		return '';
	}

	var output = '';
	var columns = Object.keys(data[0]);

	// Write the columns
	for (var i = 0; i < columns.length; i++) {
		output += '"' + columns[i] + '",';
	}
	output += '\n';

	// Write the data
	for (var i = 0; i < data.length; i++) {
		for (var j = 0; j < columns.length; j++) {
			output += '"' + data[i][columns[j]] + '",';
		}
		output += '\n';
	}

	return output;
}