JSON Array of Objects Formatting for Postman Test

Question

I'm trying to take the results of one request in Postman and put them into a second. The first request's format is as follows (leaving out some extraneous objects):

[
   {
      "lfidField": "11111",
      "featureField": "Logging",
      "keyField": "VP316coUxxxxxxx"
   },
   {
      "lfidField": "11111",
      "featureField": "Premium",
      "keyField": "egg0+4Bkmkzsxxxxxxx"
   }
]

There are more objects (as many as 8 in total, but the number can change), but the featureField will always have a unique value. I need to get a simple output of:

{
   "Logging": "VP316coUxxxxxxx",
   "Premium": "egg0+4Bkmkzsxxxxxxx"
}

And obviously that would need to iterate to any number of objects from the first request. I'm extremely new to this, so I'm hoping someone can help.

Need this in Chai.js formatted for a Test in Postman, sorry I wasn't clear. — user3351429
– user3351429, Commented Sep 25, 2021 at 19:33

lucas-nguyen-17 · Accepted Answer · 2021-09-26 23:13:48Z

1

In tab Test of Request 1:

const res = pm.response.json();
let log = "";
let pre = "";
res.filter((item) => {
    if (item.featureField === 'Logging'){
       log = item.keyField;
    }

    if (item.featureField === 'Premium'){
       pre = item.keyField;
    }
});
pm.environment.set("Logging", log);
pm.environment.set("Premium", pre);

In tab body of Request 2:

{
   "Logging": "{{Logging}}",
   "Premium": "{{Premium}}"
}

edited Sep 26, 2021 at 23:13

answered Sep 26, 2021 at 0:23

lucas-nguyen-17

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4 Comments

user3351429 Over a year ago

I'm getting the response: "There was an error in evaluating the Pre-request Script:TypeError: Cannot read property 'json' of undefined". I've tried moving a few things around and don't see an obvious problem. Also, can I use "collectionVariables" instead of "environment" to keep my variables contained to the collection rather than the environment? I get the same error either way, just curious.

lucas-nguyen-17 Over a year ago

Oh sorry, my bad. The code should be in Test tab, not Pre-request tab. I’ve updated the answer

user3351429 Over a year ago

That did it! Thank you so very much!!! NOTE: changing "environment" to "collectionVariables" worked just fine.

lucas-nguyen-17 Over a year ago

Yeah, no big differences between environment and collectionVariables. You can choose one of them, and it will work.

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