JavaScript object to CSV

tocsv.js

/**
* Converts a value to a string appropriate for entry into a CSV table.  E.g., a string value will be surrounded by quotes.
* @param {string|number|object} theValue
* @param {string} sDelimiter The string delimiter.  Defaults to a double quote (") if omitted.
*/
function toCsvValue(theValue, sDelimiter) {
	var t = typeof (theValue), output;

	if (typeof (sDelimiter) === "undefined" || sDelimiter === null) {
		sDelimiter = '"';
	}

	if (t === "undefined" || t === null) {
		output = "";
	} else if (t === "string") {
		output = sDelimiter + theValue + sDelimiter;
	} else {
		output = String(theValue);
	}

	return output;
}

/**
* Converts an array of objects (with identical schemas) into a CSV table.
* @param {Array} objArray An array of objects.  Each object in the array must have the same property list.
* @param {string} sDelimiter The string delimiter.  Defaults to a double quote (") if omitted.
* @param {string} cDelimiter The column delimiter.  Defaults to a comma (,) if omitted.
* @return {string} The CSV equivalent of objArray.
*/
function toCsv(objArray, sDelimiter, cDelimiter) {
	var i, l, names = [], name, value, obj, row, output = "", n, nl;

	// Initialize default parameters.
	if (typeof (sDelimiter) === "undefined" || sDelimiter === null) {
		sDelimiter = '"';
	}
	if (typeof (cDelimiter) === "undefined" || cDelimiter === null) {
		cDelimiter = ",";
	}

	for (i = 0, l = objArray.length; i < l; i += 1) {
		// Get the names of the properties.
		obj = objArray[i];
		row = "";
		if (i === 0) {
			// Loop through the names
			for (name in obj) {
				if (obj.hasOwnProperty(name)) {
					names.push(name);
					row += [sDelimiter, name, sDelimiter, cDelimiter].join("");
				}
			}
			row = row.substring(0, row.length - 1);
			output += row;
		}

		output += "\n";
		row = "";
		for (n = 0, nl = names.length; n < nl; n += 1) {
			name = names[n];
			value = obj[name];
			if (n > 0) {
				row += ","
			}
			row += toCsvValue(value, '"');
		}
		output += row;
	}

	return output;
}

Licensed under The MIT License

on line 64 row += cDelimiter; should be

also, you should double quotes in the value:
theValue.replace(/"/g, '""')
and disallow to use any other "cDelimeter"s

Hi there, thanks for the code, I had a look at your code but a bit different requirements. Here is my solution that deals with arrays of non uniform objects https://gist.github.com/select/0e2aa49b98ea81db7c615e6560497c41

This code is does not produce correct csvs. It does not use the column delimiter (only for the first row) and does not escape the value if it contains the sDelimiter. Here is my fixed version with hardcoded sdelimiter to ": https://gist.github.com/bhelm/0c3800359c73e2797e3fc545b1676aed