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.

Solution 1

This works as of Mar-2019:

pm.test("To Check if Value is Null", function() {
var jsonData = pm.response.json();
pm.expect(jsonData.<yourfield>).not.eq(undefined);
)};

Solution 2

Did you try

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

?

Solution 3

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.

Solution 4

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.

Solution 5

try this one:

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

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