In Postman, is there a way to persist request body values (as environment values)?

Question

I am trying to chain a couple of API requests together and wanted to automate the values to be carried over in the chain. Request body for first request looks something like this

{
   :
   :
   "details":{
      "identifiers":[
          {
            "id": "1234", // ---> Am setting this manually, which I need in my 2nd request.
            "idType": "SpecialID"
          },
          {
             "id": "3456",
             "idType": "uninterestingID"

          }

       ]

    }

}

Note that

• I want to use the value of id in the second request only if it is of idType "SpecialID"
• The order of these two IDs may not be fixed
• In some requests, "uninteresting" ID may not be sent BUT "SpecialID" will always be sent

Given the above conditions, how do I do this in a Postman test i.e. store the value of id in the request body of one API call and use that in a second API's request call ? If customer code is required, I don't see a way to do this in Postman.

Answer 1

If you really want to get the id from the object with the idType of "SpecialID" within the request body and save it to an environment variable, you can do the following.

let body = JSON.parse(pm.request.body.raw);

let specialID = (body.details.identifiers.find(obj => { return obj.idType === 'SpecialID' })).id

pm.environment.set("id", specialID);
console.log(pm.environment.get("id")); // 1234

Answer 2

I have used postman environment variables between tests. My test creates a single Alert, and then I want to get it, validate it returns what would have been saved, then delete the alert.

POST /api/Alerts {}

The Test can then validate results and create environment variables for the next tests.

pm.test("Response should be 200", function () { 
    pm.response.to.be.ok;
    pm.response.to.have.status(200);
});

const jsonData = pm.response.json();
pm.expect(jsonData.length).greaterThan(0);
postman.setEnvironmentVariable('Alert_Key', jsonData[0].Key_); 

I can then send a DELETE with the environment variable in the URL using brace syntax.

I have also used the tests to simply loop through all the returned values, and call DELETE routes as well.

pm.test("Response should be 200", function () { 
    pm.response.to.be.ok;
    pm.response.to.have.status(200);
});

pm.test("Parse Alert Key_ values and send DELETE", function () {
    var jsonData = JSON.parse(responseBody);
    jsonData.forEach(function (AlertRecord) {
        console.log(AlertRecord.Key_);
        const DeleteURL = pm.variables.get('TimeSheetAPI') + '/api/alerts/' + AlertRecord.Key_;
        pm.sendRequest({
            url: DeleteURL, 
            method: 'DELETE',
            header: { 'Content-Type': 'application/json' },
            body: '{ "Key_": ' + AlertRecord.Key_ + '} ' }
        , function (err, res) {
            console.log("Sent Delete: " + DeleteURL );
        });
    });
});