Postman: How to check whether the field is returning null in the Postman automation

Question

I have tried with !== null, but it is returning PASS even when the field is returning 0 or empty string.

score 32 · Answer 1 · edited Mar 08 '23 at 13:44

32

This works as of Mar-2019:

pm.test("Check if value is null", function() {
  var jsonData = pm.response.json();
  pm.expect(jsonData.<yourField>).not.eq(undefined);
});

edited Mar 08 '23 at 13:44

keplerian

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answered Mar 25 '19 at 21:49

Shiraz

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2

`.is.not.undefined` also works. If you really care about null as well, use `is.not.oneOf([null, undefined])`. – Noumenon May 28 '20 at 04:39
This is the 5th version of this that I've had to look for (no exaggeration). Works for a couple of weeks, then stops. These solutions don't work for me. Neither does .to.eql(null) which is what I had before googling it, which is no longer working for me as of today. – Kreidol Apr 30 '21 at 01:09

score 17 · Answer 2 · answered Mar 28 '18 at 18:32

17

Did you try

pm.expect(response.your_field).to.eql(null);

?

answered Mar 28 '18 at 18:32

Old Panda

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OP asked for **Not equal** – Divyang Desai Jan 23 '19 at 06:23

score 12 · Answer 3 · edited Aug 31 '18 at 20:56

12

If you are checking the Id of the first item returned in a list, you could use not.equal(null):

pm.expect(pm.response.json().value[0].Id).not.equal(null);

Note that the word "equal" is fully spelled out, although the shortened "eql" does work.

edited Aug 31 '18 at 20:56

Zysce

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answered Aug 31 '18 at 18:42

myrtle303

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Not sure if `.to` is redundant, but that is whate I use. – Jeff May 29 '19 at 12:59
Good answer, easily checks non null for json element. – Adam Mar 04 '22 at 15:55

score 3 · Answer 4 · answered May 24 '18 at 04:43

3

try this one:

pm.test("your-value is not null", function () {
var jsonData = pm.response.json();
pm.expect(jsonData.your_value).not.eql(null);
});

answered May 24 '18 at 04:43

cleo

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score 3 · Answer 5 · answered Feb 18 '19 at 22:10

3

Postman doesn't reference non-existent paths as null, but as undefined.

pm.expect(JsonResponse.FAKE.PATH).not.eql(undefined);

This test should fail, as this fake json path is actually undefined.

answered Feb 18 '19 at 22:10

Mario

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score 1 · Answer 6 · answered Nov 09 '17 at 03:20

1

I faced similar issue. But checking it in following way worked for me

tests["Item is not null"] = 
    jsonData.item !== undefined;

answered Nov 09 '17 at 03:20

Ashish Bhatt

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score 0 · Answer 7 · answered Mar 24 '17 at 07:00

0

You can access response json like :

    var json = JSON.parse(responseBody);
    var yourVAr = json.yourVar
    if(yourVar == null){
        //your var is null here
    }

answered Mar 24 '17 at 07:00

Nitin

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score 0 · Answer 8 · answered Mar 31 '17 at 04:54

I have done similar, this is one part of the code and its works well Check this code

var jsonData = JSON.parse(responseBody);

for(i=0; i<jsonData.data.length; i++){
tests["due date is between given date range"] = jsonData.data[i].duedate < environment.Cenddate && jsonData.data[i].duedate > environment.Cstartdate;

tests["response body has department name"] = jsonData.data[i].department.name !== null;

}

score 0 · Answer 9 · answered Oct 16 '17 at 22:05

0

How about:

var jsonData = JSON.parse(responseBody);

tests["Item is not null"] = 
    jsonData.item !== null && 
    jsonData.item !== ' ' && 
    jsonData.item !== 0;

answered Oct 16 '17 at 22:05

John Meyer

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Wayne Yeow · Answer 10 · 2019-07-01T04:24:09.907

You gotta place the + [i] after the function you gonna validate on the tests[] so only it will return valid statements on each array. For example,

function checkIsNull() {
    var items = json.data.pois.items
    var PlaceIdIsNull = true;
    var subTypeExtraIsNull = true;
    var websiteIsNull = true;

    for (var i = 0; i < items.length; i++) {
    if (items[i].placeId !== null) {
        PlaceIdIsNull = false;
    }
    if (items[i].subTypeExtra !== null) {
        subTypeExtraIsNull = false;
    }
    if (items[i].website === null) {
        websiteIsNull = false;
        tests['website is null only happened on these arrays' + [i]] = true;
        }
        tests['Place ID is null '] = PlaceIdIsNull
        tests['subTypeExtra is null '] = subTypeExtraIsNull
}
}
       checkIsNull();

Result:

PASS Place ID is null

PASS subTypeExtra is null

score 0 · Answer 11 · edited Jul 10 '22 at 11:27

0

Try this:

let jsonData = pm.response.json();

pm.expect(jsonData["yourfield"]).to.eq(null);

edited Jul 10 '22 at 11:27

vimuth

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answered Jul 05 '22 at 05:47

Svathna

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score 0 · Answer 12 · answered Sep 19 '22 at 06:02

0

This works as at Sept.19, 2022

     pm.test("Check that response body is not null", ()=>{
   pm.response.to.be.have.body
    })

answered Sep 19 '22 at 06:02

Piri

1

Postman: How to check whether the field is returning null in the Postman automation

12 Answers12

Result:

PASS Place ID is null

PASS subTypeExtra is null

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