Course introduction
The Complete JavaScript Course 2025: From Zero to Expert!, taught by Jonas Schmedtmann, is a practical, project-driven training that turns beginners into confident modern JavaScript developers. Updated for 2025 with the latest ES standards, the course focuses on real-world projects, coding challenges, and the inner workings of JavaScript so students become job-ready.
- Instructor: Jonas Schmedtmann
- Last updated: December 2025
- Duration: ~71 hours (71h 11m total)
- Rating: ★4.7 / 5
- Learners: 1,010,211+
- Price (typical sale): ~US$9–12 (varies by Udemy promotions)
- Access: Lifetime (mobile + TV)
- Certificate: Udemy Certificate of Completion included
Key highlights
- 6 real-world projects for a professional portfolio (not toy apps)
- Covers modern ES6+ and ES2024/ES2025 features from day one
- Deep dives into fundamentals: closures, prototypes,
this, higher-order functions - Asynchronous JavaScript: event loop, promises, async/await, AJAX & APIs
- 50+ coding challenges and assignments with solutions
- Modern tooling: NPM, bundlers, Babel, ES modules, and basic build workflows
- Clear explanations of architecture, design patterns, and developer workflows
- Fast, helpful Q&A support and structured learning paths
What you will learn
Fundamentals & Core Concepts
- Variables, types, operators, control flow, loops, functions
- Arrays, objects, string & date handling
- Scope, closures, hoisting, and the
thiskeyword
Modern JavaScript (ES6+)
- Arrow functions, destructuring, spread/rest, optional chaining
- Classes, prototypes, and advanced OOP patterns
Asynchronous Programming
- Event loop mechanics and concurrency model
- Promises,
.then()chains, async/await patterns - Fetch API, AJAX, and calling real-world APIs
Advanced Topics & Architecture
- Higher-order functions, functional patterns, immutability
- Modular code, dependency management, and code organization
- Error handling, testing basics, and debugging techniques
Tooling & Projects
- NPM scripts, bundlers (Parcel/other), Babel/transpilation basics
- Build several full projects (e.g., interactive apps, REST consumers)
- 50+ hands-on coding challenges to cement learning
Career & Workflow
- How to think and work like a developer (problem solving, researching)
- Portfolio-ready projects and guidance for interviews and job readiness
Frequently asked questions (FAQ)
Q — Is this course suitable for absolute beginners?
A — Yes. No prior JavaScript required; course includes crash-course material for HTML/CSS where needed.
Q — Which JavaScript version does the course teach?
A — The course covers modern ES6+ features and has been updated for ES2024/ES2025 additions.
Q — Will I build real projects?
A — Yes — six real-world projects and many mini-projects that are portfolio-ready.
Q — Are there exercises and solutions?
A — Yes — 50+ coding challenges and assignments with solutions are included.
Q — Do I get a certificate?
A — Yes. Udemy issues a Certificate of Completion.
Why this course is worth it
Jonas Schmedtmann is known for clear explanations and high-quality projects. This course blends theory, deep conceptual clarity, and lots of practice — exactly what you need to become a professional JavaScript developer. The projects and challenges build a portfolio that employers care about, and the updates for modern ES features keep it current.
