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Learn how to fetch integer values from JSON in XSLT, converting JSON to JSON effectively. Get practical tips for ensuring correct data types in your output.
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Fetching Integer Values in XSLT from JSON: A Comprehensive Guide

In the world of data transformation, XSLT (eXtensible Stylesheet Language Transformations) plays a crucial role, especially when it comes to converting data between formats like JSON and XML. However, manipulating data types correctly, such as integers, can often lead to confusion. One common problem developers encounter is the issue of incorrect data representation—specifically when integer values appear in double quotes in the output. In this guide, we'll explore how to correctly fetch and represent integer values when transforming JSON to JSON using XSLT.

Understanding the Problem

Consider a simple JSON input with both string and integer values:

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When performing JSON to JSON conversion via XSLT, you may attempt to represent the data in key-value format like this:

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However, you might notice that the integer value (id) is being outputted as an empty string, resulting in an incorrect output:

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The expected output should look like this:

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The issue here lies in the data type handling of the id value from JSON input.

Solution: Correctly Fetching Integer Values

To resolve this issue, we must understand how JSON data types are handled in XSLT. In XSLT 3.0, JSON only recognizes a single numeric type, known as double. Here are the steps you’ll need to follow to obtain integer values correctly:

1. Use the number Element

When representing numerical values in your output JSON, utilize the <number> element instead of the <string> element. This ensures that the values are output correctly as numbers rather than strings:

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2. Sample XML Representation

The modified XSLT would look somewhat like this:

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3. Producing Correct Output

With the adjustments made, when you run this transformation, the integer value for id1 will appear correctly without double quotes. Therefore, the final output structure should be:

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Conclusion

Handling JSON data transformations efficiently in XSLT requires a clear understanding of data types and their representation in different formats. By following the approach outlined above, you can successfully fetch integer values and ensure they are correctly formatted in your output JSON. Remember to always use the <number> element for numerical data to prevent representation issues like the one encountered in this scenario. Implement these tips in your next XSLT project to improve your data handling skills!