By entering the Interfaces / Components page, you will find a special component called Custom Filters, this is the place where you can add a new JavaScript function, a new filter, or a new variant of an existing filter to your DPS application.
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Click on the EDIT CUSTOM CODE button, a code area will allow you to write the JavaScript code that will be loaded together with the other components (e.g. built-in filters).
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The Custom Filters component is designed to add simple JS functions, or register simple filter variants.
If you plan to define reusable and more complex components, we suggest you take a look at the Components Manager.