How to Get Value from Response in Postman
Postman is a popular API development tool that allows developers to send requests and receive responses from APIs. Oftentimes, extracting specific values from the response is necessary to perform further actions or validations. In this article, we will explore how to efficiently retrieve values from the response in Postman.
How to Get Value from Response in Postman?
The way to get a value from a response in Postman is by using Postman variables and JSON path expressions. By properly utilizing these features, you can easily extract and store values for later use in your requests or tests. Here’s a step-by-step guide on how to achieve this:
1. Start by sending a request to the desired API endpoint in Postman.
2. Once the response is received, switch to the “Tests” tab, located below the request builder section.
3. Within the “Tests” tab, you can write JavaScript code to extract values from the response.
4. Use the Postman provided “pm.response.json()” object to convert the response body into a JSON object.
5. Utilize JSON path expressions to navigate through the JSON structure and extract the desired value.
6. Assign the extracted value to a Postman variable using “pm.variables.set()” function.
7. You can now access the stored value throughout your requests and tests.
Now that you know the basic procedure, let’s dive into some frequently asked questions related to extracting values from the response in Postman:
FAQs:
1. How do I extract a value from a JSON response in Postman?
To extract a value from a JSON response, you need to access the desired value using the appropriate JSON path expression and store it in a Postman variable.
2. How can I extract a value from a response and use it in a subsequent request?
By storing the extracted value in a Postman variable, you can easily access it in subsequent requests using double curly braces notation, like {{variableName}}.
3. Can I extract multiple values from a single response?
Yes, you can extract multiple values from a single response by using multiple JSON path expressions and storing each value in a separate Postman variable.
4. How can I extract a value if it is nested within multiple objects or arrays?
To extract a value that is nested within multiple objects or arrays, construct the appropriate JSON path expression that includes the necessary navigation through the JSON structure.
5. Is it possible to extract a value based on a condition?
Yes, you can extract a value based on a condition by utilizing JavaScript within the “Tests” tab. You can write custom code that applies the condition and extracts the value accordingly.
6. What if I want to extract a non-JSON response value?
If the response is not in JSON format, you can still extract values using different techniques such as regular expressions or extracting from raw text by manipulating the response body.
7. Can I extract values from XML responses?
Yes, although Postman primarily supports JSON responses, you can extract values from XML responses by using external libraries or custom JavaScript code within the “Tests” tab.
8. How can I access the extracted value within the request builder section?
Once you have stored a value in a Postman variable, you can access it within the request builder section by using the double curly braces notation, for example, {{variableName}}.
9. Can I extract response values without writing JavaScript code?
Yes, Postman provides various built-in features and functionalities like response body parsing, response test snippets, and convenient UI-driven options to extract values without necessarily writing custom JavaScript code.
10. Can I extract values from a response and use them in collection or folder variables?
Yes, you can extract values from a response and assign them to collection or folder variables using the “pm.variables.set()” function. These variables can be accessed and used within the collection or folder where they are defined.
11. How can I validate and assert the extracted values?
You can use assertions in the “Tests” tab to validate and assert the extracted values against expected values. This allows you to ensure the correctness of the extracted values during API testing.
12. Can I use extracted values within pre-request or post-request scripts?
Yes, extracted values stored in Postman variables can be accessed and used within pre-request or post-request scripts. This enables you to dynamically generate requests or perform additional actions based on the extracted values.
In summary, utilizing Postman variables and JSON path expressions allows you to efficiently extract and store values from API responses. The extracted values can then be used for subsequent requests, validations, or custom scripting needs, making your API testing and development workflows more effective and streamlined.