Setting variables from response in Postman - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of setting variables from a response in Postman?

It allows you to save data from an API response to use later in your tests or requests, making your tests dynamic and reusable.

beginner

How do you access a JSON field named 'token' from a response in Postman test script?

Use pm.response.json().token to get the value of the 'token' field from the JSON response.

beginner

Which Postman method is used to set an environment variable from a response?

Use pm.environment.set('variableName', value) to save a variable in the environment scope.

intermediate

Write a simple Postman test script snippet to save the 'id' field from a JSON response as a collection variable named 'userId'.

const jsonData = pm.response.json();
pm.collectionVariables.set('userId', jsonData.id);

beginner

Why is it better to use variables in Postman tests instead of hardcoding values?

Variables make tests flexible and maintainable by allowing reuse of dynamic data, reducing errors and manual updates.

Which method extracts JSON data from a Postman response?

A pm.request.body()

B pm.response.text()

C pm.response.json()

D pm.environment.get()

pm.response.json() parses the response body as JSON so you can access its fields.

How do you set a global variable named 'sessionId' in Postman from a response value 'sid'?

A pm.globals.set('sessionId', pm.response.json().sid)

B pm.environment.set('sessionId', pm.response.json().sid)

C pm.collectionVariables.set('sessionId', pm.response.json().sid)

D pm.variables.set('sessionId', pm.response.json().sid)

pm.globals.set() sets a global variable accessible across all collections and environments.

What is the correct way to save a response header 'Auth-Token' as an environment variable 'authToken'?

A pm.environment.get('authToken', pm.response.headers.get('Auth-Token'))

B pm.environment.set('authToken', pm.response.headers.get('Auth-Token'))

C pm.response.set('authToken', pm.response.headers.get('Auth-Token'))

D pm.variables.set('authToken', pm.response.body.Auth-Token)

pm.response.headers.get() retrieves the header value; pm.environment.set() saves it as a variable.

Which scope is NOT available for variables in Postman?

A Session

B Environment

C Global

D Collection

Postman does not have a 'Session' variable scope; it has Global, Environment, Collection, and Local.

Why should you check if a response field exists before setting a variable from it?

A To clear all variables

B To speed up the test execution

C To automatically retry the request

D To avoid errors if the field is missing

Checking prevents runtime errors when the expected field is not present in the response.

Explain how to extract a value from a JSON response and save it as an environment variable in Postman.

Think about parsing JSON and setting variables in Postman scripts.

Describe why setting variables from responses is useful in API testing with Postman.

Consider how tests behave when data changes.