Скачать или смотреть Parsing JSON with Powershell: Extracting Values Based on Conditions

Discover how to parse `JSON` in `Powershell` and extract specific values using conditional logic, specifically when handling API responses.
---
This video is based on the question https://stackoverflow.com/q/76031374/ asked by the user 'BrettFK' ( https://stackoverflow.com/u/4446914/ ) and on the answer https://stackoverflow.com/a/76039733/ provided by the user 'mclayton' ( https://stackoverflow.com/u/3156906/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Parsing JSON with Powershell - get a value based on another value

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Parsing JSON with PowerShell: Extracting Values Based on Another Value

When working with APIs, it’s common to receive responses in the form of JSON. While parsing this format in Powershell, especially when the data might vary (e.g., some fields being empty), can present challenges. A common problem arises when you need to extract values based on certain conditions, such as obtaining names from both standard and custom fields.

In this guide, we will look at a real-world scenario where you might need to parse JSON responses from an API and get values based on the presence or absence of data in specific fields. We'll focus on how to handle missing names and leverage custom fields efficiently using Powershell.

Understanding the JSON Response

Let's start by examining the structure of the typical JSON response received from an API. Here's a simplified version of what you might expect:

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

In the above example, the from field contains the requester’s name and address. However, there are cases where this information might be blank, in which case we must look for it in the custom_fields.

The Solution: Conditional Value Extraction

To tackle this issue, we can create a Powershell script that processes the JSON response. Here’s a step-by-step breakdown of how to handle this effectively:

Step 1: Set Up Test Data

Before we begin parsing, we'll first define a JSON object similar to our API response for testing purposes.

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

Step 2: Loop Through Results

Next, we iterate over each item in the results array to check if the requester's name exists in the standard field.

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

Step 3: Handling Output

By running the above script snippet, you can effectively retrieve the requester’s name, whether it’s found in the from field or the specified custom fields. For our example, when no name is found in the from field, it will successfully extract "FirstName" from the custom_fields.

Conclusion

Parsing JSON in PowerShell can be straightforward once you understand the structure you're working with and how to navigate it using conditional logic. By applying the steps outlined in this guide, you can confidently extract necessary values even when the data provided is incomplete. Always ensure to add additional error handling to accommodate cases with missing or null data to make your scripts more robust.

Feel free to reach out if you have further questions or require assistance on specific parts of your code!