This will take in a Sudoku possible solution as a string and validate it.

sudokuSolutionValidator.js

var solutions = [
	'192356847643817952875429631584173296761592384239684175458231769926748513317965428',
	'359784612821369745764251839247893561698517324513426987485932176976148253132675498',
	'359784612821369745764251839547823961698517324213496587485932176976148253132675498'
];

function isValidSolution(grid) {
	if (typeof grid !== 'string' || grid.length !== 81) {
	   return false;
	} else {
		return testRows(grid) && testColumns(grid) && testBoxes(grid);
	}
}

function getEmptyBitmap() {
	var bitmap = [];
	for(var i=1; i <= 9; i++) {
		bitmap[i] = 0;
	}
	return bitmap;
}

function checkBitmap(bitmap) {
	for(var i=1; i <= 9; i++) {
		if (bitmap[i] !== 1) {
			return false;
		}
	}
	return true;
}

function testRows(grid) {
	var isValid = true;
	var i, j, bitmap;
	for(i=0; i < 81; i += 9) {
		bitmap = getEmptyBitmap();
		for(j=0; j < 9; j++) {
			bitmap[parseInt(grid[i+j], 10)] += 1;
		}
		isValid = isValid && checkBitmap(bitmap);
	}
	return isValid;
}

function testColumns(grid) {
	var isValid = true;
	for(var i=0; i < 81; i += 9) {
		var bitmap = getEmptyBitmap();
		for(var j=0; j < 9; j++) {
			bitmap[parseInt(grid[i+j], 10)] += 1;
		}
		isValid = isValid && checkBitmap(bitmap);
	}
	return isValid;
}

function breakIntoBoxes(grid) {
	var boxes = [];
	var i, j, k;
	for(i=0; i < 81; i += 27) {
		for(j=i; j < (i+9); j += 3) {
			var box = '';
			for(k=0; k < 27; k += 9) {
				box += grid[k+j];
				box += grid[k+j+1];
				box += grid[k+j+2];
			}
			boxes.push(box);
		}
	}
	return boxes;
}

function testBoxes(grid) {
	var isValid = true;
	var boxes = breakIntoBoxes(grid);
	boxes.forEach(function(box) {
		var bitmap = getEmptyBitmap();
		for(var i=0; i < box.length; i++) {
			bitmap[parseInt(box[i], 10)] += 1;
		}
		isValid = isValid && checkBitmap(bitmap);
	});
	return isValid;
}

solutions.forEach(function(solution) {
	console.log(isValidSolution(solution));
});