Saving a Postman header value into a variable throughout requests in a collection

Question

I am trying to automate my test suite in Postman so that I don't have to manually go into each request and change that header value to what I initially put in the first request.

My test suite currently looks like:

First Request:

var headerValue = postman.setGlobalVariable('Number', headerValue);
console.log("Number is: " + headerValue);

Second Request Header:

Number - {{headerValue}}

I would expect headerValue to have the value of 'Number' since I have set it as a global variable but it is coming back as undefined. I'm not sure what I am doing wrong.

Solution 1

This is how you can do this

If Refresh_token is the header value

postman.setGlobalVariable("refresh_token",postman.getResponseHeader("Refresh_token") );

Official Documentation: https://www.getpostman.com/docs/postman/scripts/test_examples

Solution 2

It seems like @Sai's answer does not work is not recommended anymore, since getResponseHeader is deprecated now. The updated code is:

pm.test("First request", function() {
    let headerValue = pm.response.headers.get("Number")
    pm.globals.set("Number", headerValue);
});

In the second request go Headers section, add a new header with Number as a key and {{Number}} as a value.

Solution 3

Just as an addition to Rostyslav Druzhchenko's answer. In Postman Client you can add this directly in the Tests tab:

Solution 4

No, try this way. For postman, if you want to set environment or global variable just use (key,value ) pattern this way-

postman.setEnvironmentVariable(key,value) or   
postman.setGlobalVariable(key,value) 

and finally grab them using {{key}}

var headerValue = ”your value goes here”;
postman.setGlobalVariable('Number', headerValue);

and use {{Number}} on your sub subsequent request header

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Comments

[Admin]

Currently getting a 'Number' is not defined doing it this way in the console still

[Admin]

Is there a postman.getHeader method or a method that is similar to that? I'm trying to get the value of a header in my header request instead of hard coding it in the test suite

[Always Sunny]

@jmcconnell postman.getResponseHeader("Content-Type"); //Note: the getResponseHeader() method returns the header value, if it exists. and more about methods here getpostman.com/docs/testing_examples

[SGT Grumpy Pants]

This answer uses code that is now deprecated. You should use pm.globals.set("Number", pm.response.headers.get("Number"));.

[Miquel Canal]

This should be accepted answer as of Postmant 7.34.0 getResponseHeader does not exist on pm object.