Solving JSON Object Filtering Issues in Karate API Test Framework

Discover how to filter JSON objects in the Karate API Test Framework effectively, using a straightforward example to find values based on specific keys.
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This video is based on the question https://stackoverflow.com/q/66464456/ asked by the user 'Kumar' ( https://stackoverflow.com/u/14472788/ ) and on the answer https://stackoverflow.com/a/66467593/ provided by the user 'Peter Thomas' ( https://stackoverflow.com/u/143475/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving JSON Object Filtering Issues in Karate API Test Framework

Working with JSON data can be challenging, especially when you need to filter a specific value based on the value of another key. If you’re using the Karate API Test Framework and find yourself stuck with this problem, you’re not alone. In this post, we’ll dive into a common JSON filtering scenario and show you how to achieve the desired results.

The Challenge

Imagine you have a JSON object representing a collection of cats, where each cat has a name and a list of kittens. Your goal is to extract the nickName of a kitten based on its id. Here is a modified version of the JSON structure:

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

In this scenario, you aim to find the nickName of the kitten with id 233, which is Bob2.

However, you might find yourself confused about how to navigate the nested structure, especially when working with multiple names and kittens.

The Solution

The key to successfully filtering your JSON object lies in understanding how to access nested arrays correctly. Below, I’ll explain how to achieve this using the Karate API Test Framework.

Step-by-Step Guide

Accessing the Cat Collection
To correctly filter through the nested structure, you need to use the wildcard operator [ * ]. This allows you to search through each cat's kittens.

Filtering Kittens by ID
Instead of calling get[0] cat.kittens, use the following Karate syntax to retrieve the correct nickName:

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

Here:

cats[*].kittens navigates through each cat's kittens.

[?(@ .id==233)] filters for the kitten where the id is 233.

Alternative Method
There’s also a more straightforward method using the .. operator, which can simplify your query:

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

The .. operator allows you to search for kittens at any nesting level, making it a flexible choice.

Conclusion

JSON object filtering in the Karate API Test Framework doesn’t have to be a daunting task. By understanding how to navigate nested arrays and using the appropriate syntax, you can easily retrieve values based on specific keys.

Whether you use the wildcard operator or the .. syntax, these methods will allow you to find values like the nickName of kittens based on their id. Remember, practice makes perfect—so don't hesitate to experiment with different JSON structures to internalize these techniques!

If you have any more questions or encounter further issues, feel free to reach out. Happy testing!

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