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Learn how to fetch values from nested JSON objects in Postman with this step-by-step guide. Perfect for API testing and response management.
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This video is based on the question https://stackoverflow.com/q/68349883/ asked by the user 'user1865709' ( https://stackoverflow.com/u/1865709/ ) and on the answer https://stackoverflow.com/a/68350506/ provided by the user 'lucas-nguyen-17' ( https://stackoverflow.com/u/7574461/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Easily Retrieve All Values from a Nested JSON in Postman

If you're using Postman for API testing, you might find yourself handling JSON responses that come with nested structures. One typical challenge is retrieving specific values from such nested JSON objects. In this post, we'll tackle the problem of extracting all values from attributes containing the text "instruction" in a JSON response. This will help you streamline your API testing process and manipulate data more effectively.

The Challenge

Consider an API response that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

From this response, your goal is to:

Get values from all attributes containing text "instruction".

Store these values in a list for future access.

Step-by-Step Solution

To achieve this, we will use Postman’s built-in JavaScript functionality to manipulate the JSON response. Here's a comprehensive breakdown of how to do this:

Step 1: Parse the JSON Response

First, you need to parse the JSON data received from the API. You can do this easily with the pm.response.json() method.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Get the Keys of the Nested Object

We will retrieve the keys from the "properties" object, which contains our desired attributes:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Initialize an Array for Values

Next, create an empty array to hold the values of the instructions:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Loop Through the Keys

Iterate through the keys we retrieved and push each corresponding value into the values array:

[[See Video to Reveal this Text or Code Snippet]]

Step 5: Log the Results

Finally, you can log the values array to see all the extracted instruction values:

[[See Video to Reveal this Text or Code Snippet]]

Final Code Example

Putting it all together, here's the complete code snippet you will use in Postman to extract the values:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Fetching values from nested JSON objects in Postman doesn't have to be complicated. By using simple JavaScript methods, you can easily parse and manipulate your API responses to retrieve important data. This knowledge not only improves your efficiency when working with APIs but also enhances your overall testing workflow.

Now you're ready to take control of your API data like a pro! Happy testing!