How to Dynamically Divide Numbers in a JSON Array with JOLT

Learn how to use JOLT to divide a number within a JSON array, ensuring your data transformations are accurate and effective.
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This video is based on the question https://stackoverflow.com/q/67176367/ asked by the user 'takotsubo' ( https://stackoverflow.com/u/13070305/ ) and on the answer https://stackoverflow.com/a/67186517/ provided by the user 'Barbaros Özhan' ( https://stackoverflow.com/u/5841306/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Dynamically Divide Numbers in a JSON Array with JOLT

Managing and transforming data can be a tricky task, especially when working with JSON structures. One common problem developers face is the need to modify values within arrays dynamically. In this post, we will focus on a specific example where we need to divide a number found within an array, using JOLT – a JSON transformation library.

The Problem Overview

Imagine you have the following JSON data structure that contains a queryParams field with an array named limit:

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The requirement is to dynamically divide the number inside the limit array by 2. Our goal is to transform the array so that the limit changes from ["500"] to ["250"].

Initial Attempt

A common approach may look something like this:

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However, as you've noticed, this doesn't yield the desired outcome. Let's explore the correct solution together.

The Solution

To achieve the transformation correctly, we need to consider that the limit is not a single integer value but rather an array. Therefore, we must extract the first element of that array before applying the division. This involves a two-step conversion process using JOLT.

Step-by-Step Transformation Process

Step 1: Extract and Divide

First, we will modify the limit value by extracting the first element of the array and then dividing that value by 2. The specification for this operation is as follows:

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Explanation:

firstElement(@ (1, limit)): This function extracts the first element from the limit array.

The result is stored in a temporary key (lmt).

We then divide the value stored in lmt by 2 to update the limit.

Step 2: Shift Transformation

Once we've modified the limit, we might want to hide the auxiliary key (lmt) from our final output. We achieve this with a shift operation:

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Complete JOLT Specification

Combining both steps provides us with the full JOLT specification to achieve the desired output:

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Expected Outcome

After applying the above JOLT specification, the output should resemble the following structure:

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Conclusion

Transforming JSON data can pose challenges, but with the right approach using JOLT, you can dynamically manipulate your data structures effectively. By following the step-by-step process outlined above, you can ensure that values within arrays are properly managed and manipulated to meet your specific needs. Give it a try, and don't hesitate to explore further functionalities JOLT has to offer!

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