index.html

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> 

<style type="text/css">
#form{
	padding: 10px;
}
#form label{
	width: 150px;
	color: blue;
	float: left;
}
#form input {
	margin: 2px;
}
#frmCvrlive{
	color: red;
	font-size: 14px;
	font-weight: bold;
	padding: 10px;
	width:500px !important
}
</style>

<div id="form">
<label>CVR</label><input type="text" id="frmCVR"><br>
<label>Result</label>
<span id="frmCvrlive" ></span>
<textarea cols='60' rows='8' id="cvr_respons">Result...</textarea>
</div>

<script type="text/javascript">
jQuery( document ).ready(function() {
	jQuery("#frmCVR").blur(function(e) {

		var cvr = jQuery("#frmCVR").val();
    	var reg = new RegExp("^[0-9]{8}$");
    	if(!reg.test(cvr))
    	{
			$('#frmCvrlive').show();
			$('#cvr_respons').hide();
			$('#frmCvrlive').html('angiv et gyldigt CVR-nummer'); 
			
    	}
    	else
    	{
		
		$('#frmCvrlive').hide();
			jQuery.getJSON("http://cvrapi.dk/api?search="+cvr+"&country=dk", function(data){
				$('#cvr_respons').show();
				
				//  to fetch specif data
				//console.log('companyName:'+data.name+'&#13;&#10;'+'Phone:'+data.phone+'&#13;&#10;'+'Email:'+data.email+'&#13;&#10;'+'zipCode:'+data.zipcode+'&#13;&#10;'+'Adreess:'+data.address);
				$.each(data, function( index, value ) {
  					$('#cvr_respons').append("&#13;&#10;"+index + ": " + value);
				});
					
			}).fail(function(jqXHR, textStatus, errorThrown) { 
					$('#frmCvrlive').show();
					$('#cvr_respons').hide();
					$('#frmCvrlive').html('angiv et gyldigt CVR-nummer');
				})
			}

		
    });
});
</script>