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Web Development / Beginner

AJAX and Fetch Tutorial

A focused AJAX & Fetch curriculum from fundamentals through practical and advanced topics, with topic-specific examples.

80 lessons~16 hoursvFetch API workspace_premium Certificate available

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Course curriculum

MODULE 01

HTTP Requests

10 lessons

1fetch GET request

2fetch POST JSON

3Request headers

4Query parameters

5URLSearchParams

7Response status

8Response headers

10Text response

MODULE 02

Fetch Options

10 lessons

2credentials option

5redirect option

6referrerPolicy option

7integrity option

8keepalive option

10custom Request object

MODULE 03

Async Patterns

10 lessons

1async await fetch

2Promise chaining

3Parallel requests

4Promise.allSettled

5Sequential requests

6Retry with backoff

7Timeout with AbortController

8Cancel request

10Request deduplication

MODULE 04

Forms & Uploads

10 lessons

1FormData submission

2URL encoded form

4Multiple file upload

5Upload progress limitation

6JSON form submission

7CSRF token header

8Disable submit while pending

10Validation response handling

MODULE 05

Errors

10 lessons

2HTTP error handling

7Malformed JSON

9Offline detection

MODULE 06

CORS & Security

10 lessons

1Same-origin policy

2CORS simple request

3CORS preflight

4Access-Control-Allow-Origin

5Credentials with CORS

6CSRF considerations

7Content-Type constraints

8Avoid exposing secrets

9CSP connect-src

10HTTPS requests

MODULE 07

Streaming & Advanced

10 lessons

1ReadableStream response

2Streaming text

4Server-sent events comparison

6ArrayBuffer response

7Clone response

8Response.bodyUsed

9Service worker interception

10Beacon comparison

MODULE 08

Architecture & Testing

10 lessons

1API client wrapper

2Centralized error handling

3Request interceptor pattern

4Response normalization

6Dependency injection

7Cache API integration

8ETag conditional request

9Pagination requests

10Infinite scrolling

Certificate Included

AJAX and Fetch Certificate

Earn this credential in either of two ways: complete 100% of the course, or take the master exam directly and score 85% or higher. You do not need to finish the course before attempting the exam.

Course completion path

Finish every published lesson → completion certificate is issued automatically.

Mastery exam path

15 MCQs · 100 marks · 30 minutes · 85% pass · 4 attempts.

Fresh questions each attemptNo backtrackingPublic verificationAdd to LinkedIn

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