How to Create a JSON Array from API Responses in Karate

Discover how to efficiently extract values from API responses and store them in a `JSON array` format using Karate configuration. Continue reading to learn best practices and nuances!
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How to Create a JSON Array from API Responses in Karate

When working with APIs, it’s common to need to extract data for processing later on. If you're using Karate, a powerful testing framework for APIs, you might seek a way to store extracted values from an API response in a JSON array format. This guide will address the problem of converting API response data into a usable JSON array in Karate.

The Problem Statement

You have an API that you need to call only once, and you want to capture specific pieces of data from its response—specifically, userId and country—and store them in a JSON array format. Your initial attempt at achieving this might look like the following:

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

However, you may find that your log outputs something that looks like [object Object],[object Object] instead of a readable JSON format.

The Expected JSON Array Output

For clarity, here’s the format you expect to achieve with your JSON array:

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

The Solution

Step 1: Call Your API and Extract Data

The first part of your code remains largely unchanged; you will still call the API and extract the desired values.

Step 2: Convert Your Array

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

Step 3: Log and Verify Your JSON Array

After the conversion, you can log your array to verify the results:

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

Troubleshooting

If the conversion doesn't yield the expected results, there may be a bug with Karate itself. If you suspect this is the case, you are encouraged to contribute a fix or report it to the community for further assistance.

Conclusion

By following the steps outlined above, you can effectively extract values from an API response and store them in a JSON array format for further use in your tests. With Karate, managing API responses becomes a straightforward process, enabling you to focus more on writing robust tests rather than worrying about data handling.

Now, you’re equipped with solid insights into managing JSON arrays in Karate. Happy testing!