Fetch API in Vue components - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Fetch API used for in Vue components?

The Fetch API is used to get data from a server or send data to a server asynchronously inside Vue components.

beginner

How do you trigger a fetch request when a Vue component loads?

You use the onMounted lifecycle hook to run the fetch request when the component is first shown.

intermediate

Why should you use ref or reactive when fetching data in Vue?

Using ref or reactive makes the fetched data reactive, so the component updates automatically when data changes.

intermediate

What is a common way to handle errors when using Fetch API in Vue?

You catch errors with try...catch inside an async function or use .catch() on the fetch promise to handle problems gracefully.

beginner

How can you show a loading state while fetching data in a Vue component?

Create a reactive variable like isLoading set to true before fetch, then set it to false after data loads to show or hide a loading message.

Which Vue lifecycle hook is best for fetching data when a component appears?

A onUpdated

B onMounted

C onBeforeUnmount

D onCreated

The onMounted hook runs after the component is added to the page, perfect for fetching data.

What does the Fetch API return when you call fetch(url)?

A A promise that resolves to a Response object

B The data directly

C An error object

D A Vue reactive variable

Fetch returns a promise that resolves to a Response object, which you then process to get data.

How do you make fetched data reactive in Vue 3 Composition API?

A Use ref() or reactive() to store the data

B Store data in a normal variable

C Use computed() only

D Use watch() only

ref() or reactive() create reactive data containers that update the UI when changed.

Which method converts a fetch Response to JSON?

A response.data()

B response.text()

C response.json()

D response.parse()

response.json() parses the response body as JSON.

What is a good practice to handle fetch errors in Vue?

A Use alert() without catching errors

B Ignore errors

C Reload the page automatically

D Use try...catch inside async functions

Using try...catch helps catch and handle errors gracefully.

Explain how to fetch data in a Vue component using the Composition API.

Think about when the component loads and how to keep data reactive.

Describe how to show a loading message while fetching data in Vue.

Consider how to track and display loading status.