What is the best way to determine if a value exists in a JSON response?

Question

What is the best way to determine if a value exists in a JSON response?

I am currently creating a test in Postman to verify if a JSON response contains the 'RegressieMapTest' Label. Here is my script:

pm.test("Is the folder created correctly?", function(){
var jsonData = pm.response.json();
var objString = JSON.stringify(jsonData);
var obj =  JSON.parse(objString);

for (var i = 0; i < obj.Corsa.Data.length; i++){
    if (obj.Corsa.Data[i].Label == "RegressieMapTest"){
        console.log(obj.Corsa.Data[i].Label);
        pm.expect(obj.Corsa.Data.Label).to.eql("RegressieMapTest");
    }
}
pm.expect.fail();   
})

However, I am running into an issue as every time I execute this script, it seems to automatically go to pm.expect.fail(), even though 'RegressieMapTest' is present in the JSON response. The error message returned by Postman is:

Is the folder created correctly? | AssertionError: expect.fail()

javascript json postman

Answer 1

Answer №1

pm.response.json() is equivalent to using JSON.parse, so there's no need to repeat the process

Additionally, consider utilizing the array.find method instead of manually looping through the array

pm.test("Is the folder created correctly?", function () {
    var jsonData = pm.response.json();

    pm.expect(obj.Corsa.Data.find(elem => elem.Label === "RegressieMapTest")).to.be.not.undefined

}

If the array contains an element with label "RegressieMapTest", it will return that data. Otherwise, it returns undefined. We are validating that it should not return undefined, indicating that the value exists.

Answer 2

pm.response.json() is equivalent to using JSON.parse, so there's no need to repeat the process

Additionally, consider utilizing the array.find method instead of manually looping through the array

pm.test("Is the folder created correctly?", function () {
    var jsonData = pm.response.json();

    pm.expect(obj.Corsa.Data.find(elem => elem.Label === "RegressieMapTest")).to.be.not.undefined

}

If the array contains an element with label "RegressieMapTest", it will return that data. Otherwise, it returns undefined. We are validating that it should not return undefined, indicating that the value exists.

Answer 3

Answer №2

Your code snippet pm.expect.fail(); is set to always run, but you actually want it to run only when the field is not found. To achieve this, consider adding a flag within your check block.

pm.test("Checking if the folder was created correctly", function(){
    var jsonData = pm.response.json();
    var objString = JSON.stringify(jsonData);
    var obj =  JSON.parse(objString);

    var isFound = false;
    for (var i = 0; i < obj.Corsa.Data.length; i++){
        if (obj.Corsa.Data[i].Label == "RegressieMapTest"){
            console.log(obj.Corsa.Data[i].Label);
            pm.expect(obj.Corsa.Data.Label).to.eql("RegressieMapTest");
            isFound = true;
        }
    }

    if (!isFound) {
        pm.expect.fail();
    }
})

Answer 4

Your code snippet pm.expect.fail(); is set to always run, but you actually want it to run only when the field is not found. To achieve this, consider adding a flag within your check block.

pm.test("Checking if the folder was created correctly", function(){
    var jsonData = pm.response.json();
    var objString = JSON.stringify(jsonData);
    var obj =  JSON.parse(objString);

    var isFound = false;
    for (var i = 0; i < obj.Corsa.Data.length; i++){
        if (obj.Corsa.Data[i].Label == "RegressieMapTest"){
            console.log(obj.Corsa.Data[i].Label);
            pm.expect(obj.Corsa.Data.Label).to.eql("RegressieMapTest");
            isFound = true;
        }
    }

    if (!isFound) {
        pm.expect.fail();
    }
})

What is the best way to determine if a value exists in a JSON response?

Answer №1

Answer №2

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