JavaScript: DOM, ES6, Promises & Async/Await Beginner
The JavaScript course by Koenig Original equips aspiring front-end and full-stack developers with core programming skills to build dynamic web applications, solving the industry challenge of inconsistent foundational training. Covering essentials like DOM scripting, ES6, and asynchronous JavaScript, it addresses demand from 62.3% of professional developers who use JavaScript, per the 2024 Stack Overflow Survey.
This course prepares learners for the JSE-40-01 Certified Entry-Level JavaScript Programmer exam, featuring a 70% passing score and 40-minute duration. With Koenig’s Guaranteed-to-Run live training and 32 hours of hands-on labs, graduates gain recognized expertise to accelerate into roles with competitive earning potential in modern web development.
Training Formats & Pricing
100% Happiness Guarantee · Free Rescheduling · Secure Payment
Course Overview
The JavaScript course by Koenig Original is a comprehensive training program designed for aspiring web developers, front-end engineers, and full-stack developers seeking to master one of the most widely used programming languages in modern web development. This course prepares learners for the JSE-40-01 Certified Entry-Level JavaScript Programmer certification exam, validating foundational skills in core syntax, data types, control structures, functions, and debugging. With 97.1% of all websites utilizing JavaScript, demand remains exceptionally high across industries, making this skill essential for roles such as Software Engineer, Frontend Developer, and Full-Stack Developer. According to recent job market data, 28% of Software Engineer postings require JavaScript, underscoring its critical role in today’s tech landscape.
Students engage with key technologies including ES6+, Document Object Model (DOM) scripting, asynchronous JavaScript with Promises and async/await, AJAX, and event handling—all delivered through hands-on labs using real browser environments like Chrome DevTools and interactive coding platforms. The lab component emphasizes practical application, where students build dynamic web applications from scratch, configure responsive user interfaces, manipulate DOM elements, and implement error handling using try-catch mechanisms. A culminating project involves creating a fully functional interactive web app that integrates user input validation, animations, and API communication via AJAX, simulating real-world development workflows and reinforcing best practices in code structure and debugging.
This Koenig Original course directly prepares candidates for the globally recognized JSE-40-01 certification, which validates entry-level proficiency in JavaScript and is increasingly sought by employers building modern web applications. Certified professionals can expect competitive compensation, with median salaries reaching $156,832 annually in the U.S., particularly for roles like Lead Software Engineer and Frontend Engineer. A key differentiator of Koenig’s offering is its Guaranteed-to-Run training model, ensuring enrolled students receive structured, instructor-led sessions with access to official courseware and live labs. Upon completion, graduates are well-positioned to advance into junior developer roles or progress toward advanced frameworks like React and Node.js, opening long-term career pathways in high-growth areas of software development.
What You'll Learn
Prerequisites
- Proficiency in HTML5 and CSS3 for structuring and styling web content.
- Basic familiarity with DOM manipulation and event handling.
- Understanding of fundamental programming logic, including control flow and functions.
- Working knowledge of HTTP request/response cycles and client-server architecture.
- Experience using browser-based developer tools for debugging and network inspection.
Certification Exam
Everything you need to know about the JSE-40-01 Exam certification exam
What's Included in Your Training
Every enrollment comes packed with resources to maximise your learning and exam success
Exam Preparation Materials
Practice Test Questions (200+)
Certificate of Completion
Post-Training Support (30 days)
Session Recording Access
Free Rescheduling (7+ days notice)
Career Outcomes
of JSE-40-01 Exam certified professionals report career advancement within 6 months
Salary Impact
Average salary increase reported after obtaining the JSE-40-01 Exam certification
*Source: Glassdoor / LinkedIn 2025
Job Roles
- Front-End Developer
- Full-Stack Developer
- JavaScript Specialist
- UI Developer
- Web Application Developer
- Lead Software Engineer
Companies Hiring
and 5,000+ organizations worldwide seeking JSE-40-01 Exam certified professionals
Course Student Reviews
Real results from IT professionals who trained with Koenig — rated 4.9/5 from 18,400+ verified reviews.
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★★★★★
“Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”
AZ-104 Certified ✓ Verified -
★★★★★
“I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”
Enterprise Client ✓ Verified -
★★★★★
“The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”
PL-300 Certified ✓ Verified -
★★★★★
“From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”
AZ-305 Expert ✓ Verified -
★★★★★
“As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”
100+ Learners Trained ✓ Verified -
★★★★★
“SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”
SC-300 Certified ✓ Verified -
★★★★★
“AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”
AI-102 Certified ✓ Verified -
★★★★★
“DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”
DP-600 Certified ✓ Verified -
★★★★★
“Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”
AZ-400 Team Training ✓ Verified -
★★★★★
“Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”
AZ-104 Certified ✓ Verified -
★★★★★
“I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”
Enterprise Client ✓ Verified -
★★★★★
“The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”
PL-300 Certified ✓ Verified -
★★★★★
“From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”
AZ-305 Expert ✓ Verified -
★★★★★
“As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”
100+ Learners Trained ✓ Verified -
★★★★★
“SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”
SC-300 Certified ✓ Verified -
★★★★★
“AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”
AI-102 Certified ✓ Verified -
★★★★★
“DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”
DP-600 Certified ✓ Verified -
★★★★★
“Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”
AZ-400 Team Training ✓ Verified
-
★★★★★
“Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”
AZ-104 Certified ✓ Verified -
★★★★★
“I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”
Enterprise Client ✓ Verified -
★★★★★
“The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”
PL-300 Certified ✓ Verified -
★★★★★
“Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”
AZ-104 Certified ✓ Verified -
★★★★★
“I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”
Enterprise Client ✓ Verified -
★★★★★
“The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”
PL-300 Certified ✓ Verified
-
★★★★★
“From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”
AZ-305 Expert ✓ Verified -
★★★★★
“As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”
100+ Learners Trained ✓ Verified -
★★★★★
“SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”
SC-300 Certified ✓ Verified -
★★★★★
“From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”
AZ-305 Expert ✓ Verified -
★★★★★
“As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”
100+ Learners Trained ✓ Verified -
★★★★★
“SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”
SC-300 Certified ✓ Verified
-
★★★★★
“AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”
AI-102 Certified ✓ Verified -
★★★★★
“DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”
DP-600 Certified ✓ Verified -
★★★★★
“Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”
AZ-400 Team Training ✓ Verified -
★★★★★
“AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”
AI-102 Certified ✓ Verified -
★★★★★
“DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”
DP-600 Certified ✓ Verified -
★★★★★
“Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”
AZ-400 Team Training ✓ Verified
Frequently Asked Questions
Everything you need to know about the JSE-40-01 Exam training course
Is the certification exam included in the JavaScript course fee, and what is the exam cost if separate?
What training formats are available for the JavaScript course, and does Koenig offer Guaranteed-to-Run scheduling?
How long is lab access provided, and what type of environment is used for the JavaScript labs?
What is Koenig's rescheduling and cancellation policy for the JavaScript course?
What is the format, number of questions, passing score, and time limit for the JavaScript certification exam?
How long is the JavaScript certification valid, and what is the renewal process and cost?
What post-training support does Koenig provide after completing the JavaScript course?
What prerequisites or prior experience are recommended before taking the JavaScript course?
What salary increase or career impact can I expect after completing the JavaScript certification?
How does Koenig's instructor-led JavaScript training compare to self-study in terms of success rate and preparation time?
Still have questions?
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Learn more about JSE-40-01 Exam before you enroll
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