V‑Spark applications are customizable analytics tools that are associated with one or more folders. When using the V‑Spark GUI, you can download the JSON configuration data that is associated with a custom application by visiting the Settings menu's Applications page and selecting the Application Editor button to the right of the application that you want to edit. This displays the Application Editor dialog, which provides Download and Upload buttons in the upper right-hand corner. You can download the JSON for your custom application for archival purposes, or modify it using your favorite text editor and re-upload the updated file to integrate your improvements.

The /appedit API provides a programmatic mechanism for retrieving the category configuration of a custom application in JSON format. You can then make any modifications that you want to the JSON text which describes the configuration of that application and re-upload it to incorporate those changes into the V‑Spark.