Developer Maroof

JavaScript Lesson 25: Fetch API & REST Endpoints in JavaScript.

Hands-on examples: GET/POST/PUT/PATCH/DELETE, query params, handling HTTP status codes, headers & auth, and building an API client for robust requests. Includes tips to avoid common pitfalls.

Watch: https://www.youtube.com/watch?v=eWdwO3SU5BU

New lesson: Async/Await & Fetch API in JavaScript.

Learn how async / await simplifies asynchronous code, how to handle errors with try/catch, and how to call REST endpoints safely with fetch (GET, POST, PUT/PATCH, DELETE). Includes status checks, JSON parsing and parallel fetch examples.

Watch: https://youtu.be/QaNzDJaW_gE

New Lesson: JavaScript Promises: create, chain, Promise.all, Promise.race & error handling.

See examples for immediate resolve/reject, chaining async calls and using Promise combinators. Includes error handling with .catch() and cleanup with .finally().

Watch: https://youtu.be/furigcfpu80

New Lesson: Asynchronous JavaScript: callbacks, setTimeout, setInterval and the Event Loop.

See how sync vs async code runs, schedule work with setTimeout/setInterval, clear timers, and why callback hell happens (and what to do next). Includes console demos to try yourself.

Watch: https://youtu.be/CqkbJHdWgLE?si=iU9UyQqzyYqsFVm7

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New short: Web Storage in JavaScript: LocalStorage, SessionStorage & Cookies.

See how to set/get items, store objects with JSON.stringify/parse, and use cookies for simple flags like visitCount. Includes safe usage notes and practical examples.

Watch: https://youtu.be/Io6tse0Ad6s

New Lesson: Forms & Validation in JavaScript

Quick, practical demos: real-time username/email validation, password + confirm checks, age/country validation, checkboxes/radios, terms validation and showing JSON output after successful submission.

Watch: https://youtu.be/1Q7ncYeaTIQ?si=0EcSnVA4ateTSEnD

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JavaScript Lesson 20 | Forms & Validation | Real-time Checks, Submission & UX 20: Forms & Validation in JavaScript. Learn client-side validation patterns: real-time checks (blur/input), showErro...

New Lesson: DOM Events & Event Listeners in JavaScript

Covers click, mouse, keyboard and form events, the event object, stopping propagation, removing listeners, and event delegation for dynamic elements.

Watch: https://youtu.be/pECqspFTYD4

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JavaScript Lesson 19 | DOM Events | Click, Mouse, Keyboard, Form Events, Delegation & Propagation 19: JavaScript DOM Events and Event Listeners. Learn how to handle click, mouse, keyboard and form events using...

New Lesson: DOM Manipulation in JavaScript

Learn how to select elements (getElementById, querySelector), change text and HTML (textContent vs innerHTML), update styles/attributes, use classList, create & remove elements, and traverse the DOM.

Watch: https://youtu.be/mC1bUOoQqG0

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JavaScript Lesson 18 | DOM Manipulation | getElementById, querySelector and DOM API | JS Tutorial DOM Manipulation selecting elements, reading/updating text (textContent / innerHTML), changing styles & attribute...

New Lesson: JavaScript Built-ins: Math, Date, String & Number

Quick, practical demos: Math.round/random/min/max, Date creation & formatting, String slice/indexOf/includes, and Number methods like toFixed/toPrecision.

Watch: https://youtu.be/ccRo6V38gNQ

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JavaScript Lesson 17 | Built-in Objects | Math, Date, String and Number | JavaScript Tutorial : JavaScript built-in objects: Math, Date, String and Number. Learn useful Math methods (PI, random, round, min/max, p...