What are actions?

0-2 years experience

1. 1How would you add a server action to handle a profile‑update form submission in a Next.js 13 app?
2. 2If a server action called from a client component fails due to a network error, what does the user see and how would you handle it?
3. 3What steps do you take to ensure the data returned from a server action is type‑safe?

2-5 years experience

1. 1You added a server action to delete a post, but after deployment the UI never updates. Walk me through how you'd debug this.
2. 2Explain why a server action you wrote is causing a full page reload instead of a client‑side update.
3. 3When you need to send a large payload to a server action, what trade‑offs do you consider and how would you mitigate performance issues?

5-8 years experience

1. 1Design a pattern for using server actions across multiple pages to manage shared state while avoiding code duplication.
2. 2How would you handle authentication and authorization checks inside server actions in a large Next.js monorepo?
3. 3Discuss the impact of server actions on caching strategies and how you'd integrate them with ISR.

8+ years experience

1. 1If your organization is migrating legacy API routes to server actions, what architectural considerations and migration plan would you propose?
2. 2How would you evaluate the long‑term maintainability of using server actions versus traditional API endpoints across many teams?
3. 3Describe how you would instrument monitoring and error reporting for server actions in a high‑traffic production environment.