How to Filter JSON Objects with Circe in Scala

Learn how to efficiently filter JSON objects in Scala using Circe, even when dealing with special characters in keys.
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Filtering JSON Objects with Circe in Scala

Handling JSON in Scala can sometimes be challenging, especially when dealing with special character keys and needing to filter out specific entries. If you’ve encountered a situation where you need to remove certain fields from your JSON object, you may have wondered about the best approach to take. In this post, we’ll address a common issue: how to filter a JSON object using Circe, a powerful library for JSON handling in Scala.

The Problem

Imagine you have a JSON object like the following:

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

The Solution

Using Circe for Filtering

The good news is that you can accomplish this task relatively simply using Circe. Below, I’ll guide you through the steps you need to follow in order to filter out the unwanted key.

Setup Circe in Your Scala Project: Before you start coding, ensure that your project is configured to use Circe. You can add the necessary dependencies in your build file.

Example Code: Here’s a step-by-step implementation using Circe’s JSON syntax and functionality:

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

Explanation of the Code

Result: The final result will only include the fields you want. When you run this code, you should get the following output:

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

Additional Options

If you find that filtering directly from a JSON object is not suitable for your case, consider the following alternatives:

Creating a Case Class: You may define a case class that only contains the fields you need. This requires the use of the @ JsonKey annotation if you’re dealing with special characters like dots in your keys.

Conclusion

Filtering JSON with Circe in Scala, while challenging at first glance due to the nuances of JSON structure and special character keys, can be achieved with the right approach. By utilizing Circe's built-in functionalities, such as asObject and filterKeys, you can efficiently create the JSON representation you require.

We hope you found this guide helpful. Happy coding!