Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

8 Questions

2 Views

Fetch API in JavaScript

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary advantage of the Fetch API over XMLHttpRequest?

Fetch API can only retrieve JSON data, while XMLHttpRequest can handle various data formats.

Fetch API is promise-based, while XMLHttpRequest is callback-based. (correct)

Fetch API is callback-based, while XMLHttpRequest is promise-based.

Fetch API can be used in service workers, while XMLHttpRequest cannot.

What is the purpose of the `json()` method in the Fetch API?

It checks if the response body is in JSON format.

It sends a JSON request to the server.

It sets the response headers to indicate a JSON response.

It converts the response body to a JSON object. (correct)

Which Content Security Policy directive controls Fetch requests?

script-src

resource-src

fetch-src

connect-src (correct)

What does the `fetch()` method return initially?

A promise that resolves with a Response object. Signup and view all the answers

Which statement about the Response object is correct?

It is a representation of the entire HTTP response. Signup and view all the answers

What is the purpose of the `fetch()` method in the Fetch API?

It provides an easy way to fetch resources asynchronously across the network. Signup and view all the answers

Which of the following is a feature of the Fetch API?

It integrates advanced HTTP concepts such as CORS and other extensions to HTTP. Signup and view all the answers

What is the purpose of the Fetch API?

It provides a JavaScript interface for accessing and manipulating parts of the HTTP protocol, such as requests and responses. Signup and view all the answers

Study Notes

The Fetch API

Provides a JavaScript interface for accessing and manipulating parts of the protocol, such as requests and responses.
Offers a global fetch() method for fetching resources asynchronously across the network.

Key Features of Fetch

Promise-based API, unlike XMLHttpRequest which is callback-based.
Integrates advanced HTTP concepts like CORS and other extensions to HTTP.

Fetch Request

A basic fetch request involves fetching a resource, parsing it, and printing the data to the console.
The simplest use of fetch() takes one argument - the path to the resource you want to fetch.
Returns a promise that resolves with a Response object, not the JSON response body directly.

Response Object

Represents the entire HTTP response.
Does not directly contain the actual JSON response body.
The json() method is used to extract the JSON body content from the Response object, returning a second promise that resolves with the result of parsing the response body text as JSON.

Fetch Request Control

Controlled by the connect-src directive of Content Security Policy.
Not controlled by the directive of the resources it's retrieving.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Explore the features and advantages of the Fetch API in JavaScript for making asynchronous network requests. Learn about the promise-based approach, integration of advanced HTTP concepts, and the global fetch() method that simplifies resource fetching.