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JavaScript for Developers Intermediate

The JavaScript for Developers course by JS Institute equips aspiring front-end developers and junior programmers with core JavaScript programming skills, solving the critical industry gap where 74% of entry-level coding jobs require certified proficiency in JS fundamentals. You’ll master syntax, control flow, functions, error handling, and debugging—gaining the ability to write, test, and troubleshoot production-ready scripts while building algorithmic thinking and best practices from day one.

This course prepares you for the JSE™ – Certified Entry-Level JavaScript Programmer (JSE-40-0x) certification, using official JS Institute curriculum. Koenig Solutions provides 30-day lab access and Guaranteed-to-Run dates, ensuring hands-on practice and scheduling reliability. Graduates gain confidence to pursue roles in web development, software testing, or front-end engineering with verified, vendor-recognized credentials.

32 Hours (4 Days)
Live Online / Classroom
20+ professionals trained

Training Formats & Pricing

1-on-1 USD 2,700
Dedicated instructor, your schedule Fastest
Public Batch USD 2,050
Group class, fixed schedule Most Popular
Self-Paced USD 199
Recorded sessions, learn anytime Best Value

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Course Overview

The JavaScript for Developers course by JS Institute is a foundational training program designed to equip aspiring programmers with core skills and comprehensive JavaScript certification training. This curriculum serves as essential JSE exam prep for the JSE Certified Entry-Level JavaScript Programmer certification. Tailored for individuals pursuing roles such as junior web developer, this course bridges the gap between programming fundamentals and real-world development. With JavaScript used on over 98 percent of websites, demand for certified developers remains strong, and employers actively seek professionals with validated scripting expertise.

Students engage with key tools including the browser console, VS Code, and Edube Interactive learning environment. The hands-on lab component allows students to build functional scripts that solve real programming challenges, such as creating interactive user prompts and implementing conditional logic. A culminating project involves developing a complete browser-based script, simulating tasks performed by entry-level developers in production environments.

Three reasons to choose JS Institute's program include our industry-recognized certification alignment, our exclusive access to official JS Institute courseware, and our dedicated 1-on-1 instructor support. This course directly prepares candidates for the JSE-40-01 certification, an industry-recognized credential that validates foundational JavaScript proficiency. JS Institute enhances learning outcomes, ensuring students master exam objectives efficiently. Upon completion, graduates are positioned to advance into intermediate development roles and contribute effectively in dynamic web and software development teams.

What You'll Learn

✓Construct JavaScript programs using ECMAScript standards, enabling efficient and reliable coding for modern web development.
✓Declare variables and manage data types following industry best practices, ensuring code clarity and type safety using ES6+ syntax.
✓Execute control flow with conditional statements and loops to optimize program logic and performance metrics.
✓Refactor functions, including arrow functions and callbacks, to write concise and maintainable code compliant with ECMAScript standards.
✓Debug exceptions using try-catch blocks and throw statements to improve program robustness and error handling.
✓Analyze JavaScript code using browser DevTools to identify bottlenecks and reduce development time through systematic troubleshooting.

Skills You'll Gain

JS Institute JavaScript JS Institute Variables JS Institute Functions JS Institute Objects JS Institute Arrays Conditional Statements Loop Structures DOM Manipulation Event Handling Async JavaScript Promise Objects Async Await ES6 Modules Class Syntax Error Handling JSON Handling Fetch API

Prerequisites

Recommended knowledge before taking this course
  • Basic understanding of web technologies (HTML and CSS)
  • Familiarity with the concept of programming (variables, control structures, functions)
  • Ability to work with text editors or IDEs (Integrated Development Environments)
  • Fundamental knowledge of how to navigate and perform basic operations on a computer
  • Willingness to learn and problem-solve
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Certification Exam

Everything you need to know about the JSE-40-01 Exam certification exam

Exam Details
Exam Name
JSE-40-01 Exam
Format
Multiple choice, labs & case studies
Questions
Duration
Passing Score
Validity
Retake Policy
Retakes are available via voucher purchase with no mandatory waiting period required by JS Institute
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JavaScript for Developers

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Course Curriculum

Structured learning with hands-on labs and real-world scenarios

1
Day 1– JavaScript for Developers Fundamentals
Defining JavaScript utility JS Institute language benefits Modern industry applications Essential development toolkits Cloud environment configuration Local machine setup guide Running JavaScript scripts Console execution techniques
2
Day 2– Variables, Data Types, and Casting
Variable declaration standards Implementing strict mode Managing dynamic values Constant variable definition Scope and hoisting mechanics Boolean, Number, BigInt primitives String, null, Symbol types Type conversion best practices
3
Day 3– Operators and User Interaction
Arithmetic and assignment logic Compound operator efficiency Logical and comparison syntax String concatenation methods Advanced operators and deletion Operator precedence hierarchy Alert and confirm dialogs Prompt input capturing methods
4
Day 4– Control Flow and Loop Logic
If and if-else logic Chained conditional execution Ternary operator usage Switch-case control structures While and do-while iteration For, for-of, for-in loops Break and continue control Loop optimization standards
5
Day 5– JavaScript Function Mastery
Function declaration patterns Local variable scope management Return statement implementation Parameter validation strategies Scope shadowing in functions Recursive programming techniques Arrow and expression functions Callback execution workflows

What's Included in Your Training

Every enrollment comes packed with resources to maximise your learning and exam success

Career Outcomes

66%

of JSE-40-01 Exam certified professionals report career advancement within 6 months

Salary Impact

+28%

Average salary increase reported after obtaining the JSE-40-01 Exam certification

Typical Salary Range (Global)
Entry$90,000–$115,000
Mid$115,000–$145,000
Senior$145,000–$180,000

*Source: Glassdoor / LinkedIn 2025

Job Roles

6
  • JavaScript Developer
  • Front-End Developer
  • Full Stack Developer
  • Web Application Developer
  • Client-Side Developer
  • UI Engineer

Companies Hiring

5,000+
Google Microsoft Meta Accenture Deloitte IBM Wipro Infosys Salesforce Adobe

and 5,000+ organizations worldwide seeking JSE-40-01 Exam certified professionals

Real Transformations

Course Student Reviews

Real results from IT professionals who trained with Koenig — rated 4.9/5 from 18,400+ verified reviews.

18,400+
Verified Reviews
4.9 / 5
Average Rating
95%
Would Recommend
1M+
Professionals Trained
  • ★★★★★

    “Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”

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    Azure Administrator

    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.”

    Sarah K.

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    CISO, Financial Services

    Enterprise Client ✓ Verified
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    “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.”

    Ahmed R.

    Ahmed R.

    Business Intelligence Lead

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  • ★★★★★

    “From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”

    Priya S.

    Priya S.

    Cloud Solutions Architect

    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.”

    James T.

    James T.

    Head of L&D, UK Enterprise

    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.”

    Aisha N.

    Aisha N.

    Security Analyst

    SC-300 Certified ✓ Verified
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    “AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”

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    David L.

    AI Engineer

    AI-102 Certified ✓ Verified
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    “DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”

    Mei W.

    Mei W.

    Data Platform Engineer

    DP-600 Certified ✓ Verified
  • ★★★★★

    “Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”

    Carlos R.

    Carlos R.

    Engineering Manager

    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.”

    Rahul M.

    Rahul M.

    Azure Administrator

    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.”

    Sarah K.

    Sarah K.

    CISO, Financial Services

    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.”

    Ahmed R.

    Ahmed R.

    Business Intelligence Lead

    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.”

    Priya S.

    Priya S.

    Cloud Solutions Architect

    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.”

    James T.

    James T.

    Head of L&D, UK Enterprise

    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.”

    Aisha N.

    Aisha N.

    Security Analyst

    SC-300 Certified ✓ Verified
  • ★★★★★

    “AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”

    David L.

    David L.

    AI Engineer

    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.”

    Mei W.

    Mei W.

    Data Platform Engineer

    DP-600 Certified ✓ Verified
  • ★★★★★

    “Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”

    Carlos R.

    Carlos R.

    Engineering Manager

    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.”

    Rahul M.

    Rahul M.

    Azure Administrator

    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.”

    Sarah K.

    Sarah K.

    CISO, Financial Services

    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.”

    Ahmed R.

    Ahmed R.

    Business Intelligence Lead

    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.”

    Rahul M.

    Rahul M.

    Azure Administrator

    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.”

    Sarah K.

    Sarah K.

    CISO, Financial Services

    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.”

    Ahmed R.

    Ahmed R.

    Business Intelligence Lead

    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.”

    Priya S.

    Priya S.

    Cloud Solutions Architect

    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.”

    James T.

    James T.

    Head of L&D, UK Enterprise

    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.”

    Aisha N.

    Aisha N.

    Security Analyst

    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.”

    Priya S.

    Priya S.

    Cloud Solutions Architect

    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.”

    James T.

    James T.

    Head of L&D, UK Enterprise

    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.”

    Aisha N.

    Aisha N.

    Security Analyst

    SC-300 Certified ✓ Verified
  • ★★★★★

    “AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”

    David L.

    David L.

    AI Engineer

    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.”

    Mei W.

    Mei W.

    Data Platform Engineer

    DP-600 Certified ✓ Verified
  • ★★★★★

    “Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”

    Carlos R.

    Carlos R.

    Engineering Manager

    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.”

    David L.

    David L.

    AI Engineer

    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.”

    Mei W.

    Mei W.

    Data Platform Engineer

    DP-600 Certified ✓ Verified
  • ★★★★★

    “Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”

    Carlos R.

    Carlos R.

    Engineering Manager

    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 for Developers course fee, and what is the cost if purchased separately?
The JavaScript for Developers certification exam is not included in the course fee. The JS Institute JSE™ – Certified Entry-Level JavaScript Programmer exam costs $69 for one attempt via OpenEDG. Vouchers with retake options are $86, while bundles with practice tests start at $95.
What training formats are available for the JavaScript for Developers course, and does Koenig offer Guaranteed-to-Run scheduling?
Koenig delivers the JavaScript for Developers course via live online instructor-led or classroom sessions, including one-on-one options. We provide Guaranteed-to-Run scheduling, ensuring your training proceeds as planned without cancellation due to low enrollment, which allows for reliable professional development planning.
How long is lab access provided for the JavaScript for Developers course, and what type of environment is used?
You receive 30 days of lab access for the JavaScript for Developers course starting from your training date. Labs use a cloud-based OpenEDG sandbox, allowing you to practice coding, debugging, and project execution directly in your browser without needing local software setup.
What is Koenig's rescheduling and cancellation policy for the JavaScript for Developers course?
Koenig permits free rescheduling of the JavaScript for Developers course up to 7 days before commencement. Cancellations made over 10 days in advance incur no fees; cancellations within 10 days trigger a 15% administrative fee. Submit all requests via the Koenig student portal.
What is the format, number of questions, passing score, and time limit for the JavaScript for Developers certification exam?
The JSE™ exam for JavaScript for Developers includes 30 questions with a 40-minute limit after a 5-minute tutorial. You must achieve a 70% score. The exam is delivered via the TestNow™ proctored platform, testing your knowledge of syntax, functions, control flow, and debugging.
How long is the JavaScript for Developers certification valid, and what is the renewal process and cost?
The JSE™ – Certified Entry-Level JavaScript Programmer credential is a lifetime certification that never expires. Per JS Institute policies, this entry-level status is permanent, meaning you face no recurring renewal fees or mandatory continuing education requirements to maintain your professional certification status.
What post-training support does Koenig provide after completing the JavaScript for Developers course?
Koenig offers 3 months of post-training mentor support, access to recorded sessions, and community forums. We also provide personalized guidance on exam registration, resume building, and offer optional retake assistance for lab modules to ensure you maximize your investment in JavaScript for Developers.
Are there any prerequisites or prior experience required for enrolling in the JavaScript for Developers course?
There are no formal prerequisites for the JavaScript for Developers course, making it ideal for beginners. We recommend basic familiarity with HTML, CSS, and programming logic. The curriculum builds from core fundamentals to intermediate development, perfect for those launching a career in web development.
What career impact and salary increase can one expect after completing the JavaScript for Developers certification?
Earning the JavaScript for Developers certification prepares you for roles like Junior Web Developer or Front-End Developer. Industry data indicates average starting salaries for these positions range from $55,000 to $70,000 annually in the U.S. market, providing a strong return on your training.
How does instructor-led training for JavaScript for Developers compare to self-study in terms of exam success and skill retention?
Instructor-led training for JavaScript for Developers significantly boosts success. Koenig students achieve a 92% pass rate, compared to roughly 60% for self-learners. You benefit from structured learning, real-time feedback, and expert mentorship, which ensures higher skill retention and faster mastery of complex programming concepts.

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