Checking for empty data in JSON in JavaScript

Question

I'm working with an API call that's returning JSON and in some scenarios some of the data is empty. For example, the snippet below shows that roleBusinessScopes is empty.

{
    "userProfile": {
        "organizationContacts": [
            {
                "roleBusinessScopes": {}
            }
        ]
    }
}

I wanted to be able to check if roleBusinessScopes is empty. I tried roleBusinessScopes.length = 0, however, that doesn't work.

When roleBusinessScopes does return data...

"roleBusinessScopes": {
    "businessScopes": {
        "scopeName": "something"
    }
}

... I can check for that:

if (organizationContacts[i].roleBusinessScopes.businessScopes[0].scopeName !== "something") 
{
    // do something
}

How can I check if roleBusinessScopes has no data?

Are you actually use if (roleBusinessScopes.length = 0)? so you miss = there. check it with if (roleBusinessScopes.length == 0) or if (roleBusinessScopes.length > 0) — Milad Abooali
– Milad Abooali, Commented Jan 21, 2020 at 23:49

Always Learning · Accepted Answer · 2020-01-21 23:43:25Z

2

You can use Object.keys(obj).length > 0 to check if object has some keys (data) or not

if (Object.keys(organizationContacts[i].roleBusinessScopes).length > 0) {
   // Not empty

} else {
  // empty

}

edited Jan 21, 2020 at 23:43

Always Learning

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answered Jan 21, 2020 at 23:41

Zohaib Ijaz

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Comments

Alessio Cantarella · Accepted Answer · 2020-01-21 23:49:36Z

Assuming the structure is always the same (and that you're in a ideal world where you don't need to check the validity of each property and child object), you could just check if businessScopes is not undefined.

let objectWithoutRoleBusinessScopes = {
  "userProfile": {
    "organizationContacts": [{
      "roleBusinessScopes": {}
    }]
  }
};
let objectWithRoleBusinessScopes = {
  "userProfile": {
    "organizationContacts": [{
      "roleBusinessScopes": {
        "businessScopes": {
          "scopeName": "something"
        }
      }
    }]
  }
};
function hasRoleBusinessScopes(objectToTest) {
  return objectToTest.userProfile.organizationContacts[0].roleBusinessScopes.businessScopes != undefined;
}
console.log(hasRoleBusinessScopes(objectWithoutRoleBusinessScopes));
console.log(hasRoleBusinessScopes(objectWithRoleBusinessScopes));

Japsz · Accepted Answer · 2020-01-21 23:41:26Z

0

You could try using Object.keys({your_object_here...}) and check the length of the returned array.

answered Jan 21, 2020 at 23:41

Japsz

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Comments

Wes Harper · Accepted Answer · 2020-01-21 23:43:10Z

0

You should be able to do something like

if (Object.entries(organizationContacts[i].roleBusinessScopes).length === 0) {
  // do something
}

Object.entries() will return a list of all the object's properties, which you can use to key in on length.

answered Jan 21, 2020 at 23:43

Wes Harper

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Comments

sudo97 · Accepted Answer · 2020-01-21 23:48:44Z

0

You could simply check if it is empty or not by this statement


if(organizationContacts[i].roleBusinessScopes === {}){
    // handle empty case here
} else {
    // handle non-empty case here
}

answered Jan 21, 2020 at 23:48

sudo97

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Comments

JonoJames · Accepted Answer · 2020-01-21 23:52:32Z

What I would use is a function to check it as there are multiple possibilities .

Sometimes a server will write null in its place so alternative checks need to be made

Us this function

 function checkempty(jsonString) { 
        if (jsonString == null ||  
            jsonString == undefined || 
            jsonString.length == 0) { 

            console.log("Name cannot be empty\n"); 
            return false; 
        } else { 
            console.log("Your response has been recorded\n"); 
            return true; 
        } 
    } 
 checkempty(Object.keys(organizationContacts[i].roleBusinessScopes))

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