UI Action can execute which type of code?

• A. Client side or server side
• B. Client side only
• C. Server side only
• D. Neither client nor server side

Answer: (A)

UI Actions in ServiceNow can run code in two environments: the client (browser) and the server (application server). If you configure the action to run on the client, its script executes in the user’s browser when the action is clicked, letting you update the form, show messages, or call client APIs without a server round trip. If you configure the action to run on the server, the script runs on the server and can perform data operations like creating or updating records, applying business logic, or calling external services. You can even include both client-side and server-side scripts in a single UI Action, so the client script handles immediate UI behavior and the server script performs the actual data processing or persistence. A common pattern is using the client script to gather input and then a server script to apply changes, potentially invoking the server via GlideAjax if needed. That’s why UI Action can execute either client-side or server-side code.