Engineering note
Planning the interface between a Nuxt frontend and an API
My portfolio includes Nuxt applications with Fastify, PostgreSQL, and Prisma, as well as frontend work integrating REST APIs. This note outlines the questions I recommend settling before connecting a screen to its backend.
By Walelgn Dagne · Nuxt & Vue.js developer
Describe the screen’s data contract
Start with what the user needs to see and do. For a scheduling screen, that might include a list of events, the currently selected event, and the fields needed to create or edit it. Agree on required fields, nullable values, identifiers, and the format of errors.
TypeScript types help communicate that contract inside the frontend. They do not validate a network response at runtime. When data comes from outside the application’s trust boundary, decide where it will be validated and how invalid responses will be handled.
Design more than the successful response
A screen needs useful behavior while data is loading, when the result is empty, and when a request fails. An empty list is not the same as an unavailable service. Give each state a clear message and an appropriate next action.
For writes, think through repeated clicks and retries. Disable duplicate submissions while a request is pending, and work with the backend on safe retry behavior. The user should be able to tell whether their action succeeded before trying it again.
Choose where the request should run
Nuxt can render pages on the server as well as in the browser. For initial page data, its useFetch and useAsyncData composables support transferring server-fetched data into the client payload. This avoids treating every initial request as a browser-only concern.
Keep private API credentials in server-only code and configuration. An authenticated screen also needs an explicit plan for how the server obtains the user’s session. Never put a secret in public runtime configuration just to make a browser request easier.
Verify the complete interaction
Check a direct page load and navigation from another page. Exercise an empty response, an expired session, a failed request, and a successful mutation. Confirm that updated data appears where the user expects it and that an error does not leave the interface in an ambiguous state.
These checks connect the API contract to the actual product experience. They are useful whether the backend is Fastify or another service: the frontend still needs to present a reliable account of what happened.