How to solve this null check problem?

[vngx]

Hi there
I am getting this response in REST web services
“{“userName":“ExampleName”,“userMob”:“8789878908”,“userCategory”:“HR”,“userDept”:“null”,“userSubDept”:“null”,“userEmail”:"examplename@gmail.com”,“userImage”:“E:/My Projects/College Management System/Registerd Users Images/Employee/Example Name.jpg”}”

And I am processing this JavaScript like this

    $("#userName").text(data.userName);
                    $("#userMob").text(data.userMob);
                    $("#userEmail").text(data.userEmail);
                    $("#userCategory").text(data.userCategory);
                    if(!data.userDept){
                    $("#userDept").text(" ");
                    }else{
                    $("#userDept").text(data.userDept);
                    }
                    if(!data.userSubDept){
                    $("#userSubDept").text(" ");
                    }else{
                    $("#userSubDept").text(data.userSubDept);
                    }
                    $("#userImage").attr('src',"http://localhost:8089/CollegeManagementSystem   /displayimage?imagePath="+data.userImage);
                    console.log("User Image is:"+data.userImage);
<div id="left_block" style="float: left;">
Name:<label id="userName">Name is Here</label><br>
Mob:<label id="userMob">Mobile Number is Here</label><br>
Email:<label id="userEmail">Email is Here</label><br>
Category:<label id="userCategory">Ctegory is Here</label><br>
Dept:<label id="userDept">Department is Here</label><br>
Sub Dept:<label id="userSubDept">Sub Dept is Here</label>
</div>

<div id="right_block" style="float: right;">
<img src="" alt="Image is Here" width="70%" id="userImage"></img>
</div>

my Intention is to if some value is null in REST web services then set that field to " " rather then showing null infront of them

How can I acheive this?

Thanks

[Paul_Wilkins]

@vngx

How can I acheive this?

You can also check if it is null.

if(!data.userDept || data.userDept === 'null') {

[vngx]

@Paul_Wilkins

Thanks