Ideally, you would integrate your project with a repository such as GIT. Once this is done you will have the JSON files for the Pipelines. If you need extra guidance on that the Microsoft Documentation provides very detailed information on how to do it:
Fabric Git integration process - Microsoft Fabric | Microsoft Learn
ADF Source control - Azure Data Factory | Microsoft Learn
If you want just download one JSON file for a small test purpose and check how the framework works, here are some ideas on how to do it:
Refer to the docs if needed: Azure Data Factory Documentation - Azure Data Factory | Microsoft Learn
Download Azure Data Factory support files - Microsoft Community Hub
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Open your ADF Environment, and open the resource you want the JSON.
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Click on the action ellipses
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Click "Download support files" and select the download location in local storage
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The Zip file contains the JSON Definition
