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JavaScript Foundations

Make pages think, react and remember.

Learn the language of the browser by building interactive interfaces. Modern syntax, closures, the DOM, events, async data, persistent state, modules, tests and a complete quiz app.

16 lessons 4 hours Certificate included Self-paced

Start the first lesson View curriculum

Reviewed and updated October 2026 · Free to start

What you will learn

By the end, you can do this.

Write clear, modern JavaScript
Use destructuring, closures and array methods
Manipulate the DOM and handle async data
Persist small amounts of state in the browser
Split code into modules and test it with Vitest
Ship a complete interactive app

Curriculum

16 lessons in 5 modules

464 practice drills included for extra repetition

0/16 complete

01Variables and typesStore values safely with const and let, and understand what JavaScript considers a type. 10 min 02Functions and scopePackage logic into reusable functions and understand where variables live. 12 min 03Arrays and objectsModel real data and transform it with map, filter and reduce. 14 min

04Operators and conditionalsUse arithmetic, comparison and logical operators to make decisions in code. 10 min 05Loops and iterationRepeat work with for, for...of and while, and know when an array method is better. 12 min 06JSON and dataStore and share data as JSON, and parse it safely with try/catch. 11 min 07Dates and numbersWork with dates and money safely, and avoid floating point surprises. 13 min

08Destructuring and spreadPull values out of objects and arrays, then copy and merge them without mutation. 12 min 09Closures and higher-order functionsTreat functions as values, remember state with closures and process arrays with map, filter and reduce. 14 min

10The DOM and eventsSelect elements, change content and respond to clicks, input and submits. 15 min 11Async and fetchRequest data over the network without freezing the interface. 16 min

12Storage and statePersist small amounts of state safely and keep the UI in sync with it. 12 min 13Errors and debuggingRead a stack trace, use the console deliberately and prevent silent failures. 12 min 14Modules and toolingSplit code into files, share it with import and export, and run a real project with npm. 12 min 15Testing with VitestProtect behaviour with fast tests that run in the same modern toolchain. 13 min 16Project: a quiz appShip a complete interactive quiz with scoring, feedback and a results screen. 30 min

Certification

Finish the course. Prove the skill.

Complete every lesson, then pass a timed assessment to earn the JavaScript Foundations Certificate. Each credential has a unique ID and a QR code that resolves to a live public record.

16 randomized questions
32 minute limit · 80% to pass
3 attempts per enrolment
Verifiable by QR or credential ID

Certification details Verify a credential

Pro members get five certification attempts and unlimited timed mock exams. Compare Pro

EduByte.tech

EduByte · Skills certificationIssued 26 Oct 2026

This certifies that

Your name

has successfully completed the assessed program

JavaScript Foundations

Write clear, modern JavaScriptUse destructuring, closures and array methodsManipulate the DOM and handle async data

JavaScript Foundations

By the end, you can do this.

16 lessons in 5 modules

Finish the course. Prove the skill.

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