Use [type=checkbox] to select inputs of type checkbox. Also, since [] are illegal characters in unquoted selector values, surround them in quotes: [name='type[]']
$('button').on('click', function() {
var array = [];
$("input[type=checkbox][name='type[]']:checked").each(function() {
array.push($(this).val());
});
console.log(array.toString());
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">
</script>
<input type="checkbox" name="type[]" value="GFG" id="feaut" /> GFG:
<input type="checkbox" name="type[]" value="Geeks" id="feaut" /> Geeks:
<input type="checkbox" name="type[]" value="Geek" id="feaut" /> Geek:
<input type="checkbox" name="type[]" value="portal" id="feaut" /> portal:
<br>
<button>
click here
</button>CLICK HERE to find out more related problems solutions.