Student Expert JSON Issue

akhilarelli55 · May 27, 2023, 10:08am

The Script to validate JSON data type of data:

const jsonData = pm.response.json(); 
pm.test("Test data type of the response", () => { 
pm.expect(jsonData).to.be.an("object"); 
//pm.expect(jsonData.name).to.be.a("string"); 
//pm.expect(jsonData.id).to.be.a("number"); 
//pm.expect(jsonData.courses).to.be.an("array"); 
});

JSON Data:

{
"students":[
    {
        "id": 1,
        "name": "John",
        "location": "india",
        "phone": "1234567890",
        "courses": [
            "Java",
            "Selenium"
        ]
    },
    {
        "id": 2,
        "name": "Kim",
        "location": "US",
        "phone": "98876543213",
        "courses": [
            "Python",
            "Appium"
        ]
    },
    {
        "id": 3,
        "name": "Smith",
        "location": "Canada",
        "phone": "165498765",
        "courses": [
            "C#",
            "RestAPI"
        ]
    }
]
}

**Error : Test data type of the response | AssertionError: expected [ { id: 1, name: 'John', …(3) }, …(2) ] to be an object**

Please help to resolve this issue.

w4dd325 · May 29, 2023, 9:30am

Hi @akhilarelli55

I copied your JSONdata and test code into a mock and it appears to work ok.

Currently, the only way I could replicate your issue was to remove the first part ( { "students": ) and the closing } bracket of the JSONdata so that it was an array, like this:

Can you double check your response / JSONdata and ensure that you don’t have any unsaved changes etc.

akhilarelli55 · May 29, 2023, 4:46pm

Hi James Wadley, Thank you for a quick help on this issue. As per your suggestion i tried removing ( { "students": ) and the closing } bracket of the JSONdata.

//************JSON data modified as per your suggestion:

[
{
“id”: 1,
“name”: “John”,
“location”: “india”,
“phone”: “1234567890”,
“courses”: [
“Java”,
“Selenium”
]
},
{
“id”: 2,
“name”: “Kim”,
“location”: “US”,
“phone”: “98876543213”,
“courses”: [
“Python”,
“Appium”
]
},
{
“id”: 3,
“name”: “Smith”,
“location”: “Canada”,
“phone”: “165498765”,
“courses”: [
“C#”,
“RestAPI”
]
}
]

I am getting issue in command prompt. please find the attachment of CMD and POSTMAN. Please help on this .

michaelderekjones · May 30, 2023, 9:54am

Can we see a screenshot of the actual response, just to double check that its correct.

Can you confirm if the tests are passing in Postman. Are they failing in Newman? Is that the issue?

The data looks fine. You can console log the type of a variable to aid in troubleshooting.

However, an array is a special type of object, so if you console log it, it will show as “object”. So maybe not so useful in this circumstance.

It all looks ok to me and the following tests are passing. (Based on your original response\JSON with the array).

const jsonData = pm.response.json();

console.log(jsonData);

pm.test("response to be an object", () => { 
    console.log(typeof(jsonData));
    pm.expect(jsonData).to.be.an("object");     
});

pm.test("response/students to be an array", () => { 
    console.log(typeof(jsonData.students));
    pm.expect(jsonData.students).to.be.an("array");     
});

One thing to note though is that your tests for the name, id and courses will fail as they are not targeting the array elements. You’ve got three records. Do you want to check those fields for all records? You can create a loop if you need to check each record.

I still recommend breaking your assertions into separate tests. In Postman, the first assertion in a test to fail will stop the rest of the code from executing.

Try and keep the assertions within a test to a minimum (Ideally singular).

Because the object test is failing and its the first assertion, you are not getting the feedback on the following assertions until you fix the first assertion.

w4dd325 · May 30, 2023, 10:38am

I didn’t recommend removing the first part of your JSON, I said it was the only way I could replicate your issue.

My suggestion was to check that your JSON is as you believe it to be.
when I copy-paste your example, it works.
This would suggest that you are submitting something different to what you have shared in your example above.