- What the Credential Actually Is
- Who Issues It and Where You Test
- Exam Format at a Glance
- The Six Exam Topic Groups
- How Vouchers, Attempts, and Fees Work
- What Test Day Looks Like
- Results, Certificates, and Validity
- Who Benefits From This Credential
- Preparing in a Domain-First Order
- Common Mix-Ups to Avoid
- Frequently Asked Questions
- CHS-JS1 is CodeHS's JavaScript Level 1 Certification: 45 multiple-choice questions in 90 minutes, with a 60% passing score.
- The exam covers six topic groups: Data Types and Operators, Conditionals, Loops, Program Structure, Error Handling, and Objects.
- Each voucher buys one attempt; retakes are unlimited in number but each needs another voucher, and pricing is by direct quote.
- No prerequisites exist, though the Introduction to Computer Science in JavaScript (Corgi) course is the recommended preparation.
What the Credential Actually Is
CHS-JS1 refers to the CodeHS JavaScript Level 1 Certification, an online exam that measures whether a student can read, reason about, and write foundational JavaScript. It is a certification exam, not a course final, and it is not the same thing as a Web Development Level 1 credential or a teacher microcredential. If you have seen the acronym attached to other programs elsewhere, set those aside: everything in this article describes the CodeHS exam and nothing else.
The credential is designed for learners who have worked through an introductory JavaScript curriculum and want an independent, third-party-style proof of that skill. Unlike a classroom grade, which reflects homework, participation, and teacher judgment, the certification reports a single exam result plus a breakdown of how you performed by topic. That distinction is the heart of why students pursue it: it is a portable statement that you can handle core JavaScript concepts under timed, proctored conditions.
If you want a quick definitional companion to this piece, the site also covers the basics in What Is CHS-JS1? and What Does CHS-JS1 Stand For?, and the overview page CHS-JS1 Certification ties the program together.
Who Issues It and Where You Test
CodeHS is both the governing body and the testing platform. The exam is delivered through the CodeHS Certifications app, and a teacher or authorized proctor monitors the session through the Proctor Dashboard. That means the credential lives entirely inside the CodeHS ecosystem: you do not travel to a third-party testing center, and you do not register through an outside vendor.
Testing is available at home or at school. In practice, most candidates sit the exam in a school setting with a teacher serving as proctor, but the home option exists for situations where that makes sense and a proctor can still monitor the session. Either way, the monitoring structure is built into the platform rather than bolted on.
Exam Format at a Glance
The format is straightforward and fixed. You get 90 minutes to answer 45 multiple-choice questions, and you must finish in a single sitting. Questions are randomly selected, so two candidates will not necessarily see the same set. The passing score is 60%.
| Feature | CHS-JS1 Detail |
|---|---|
| Issuer / platform | CodeHS (JavaScript Level 1 Certification) |
| Question count | 45 multiple-choice questions |
| Time limit | 90 minutes, one sitting |
| Passing score | 60% |
| Delivery | Online, at home or school, with teacher or authorized proctor monitoring |
| Integrity tools | Honor Code, randomly selected questions, Focus Mode |
| Reference material | JavaScript examination reference sheet provided |
| Results | Within 36 hours on school days, with topic-level report |
One important nuance: the 60% passing score is a threshold for you, not a statistic about how many people pass. No official cohort pass rate has been verified, so be cautious about any number you see quoted online. For a closer look at what that threshold means in practice, read CHS-JS1 Passing Score 2026, and for the data question see CHS-JS1 Pass Rate 2026: What the Data Shows.
What "multiple choice" means for a coding exam
Because every question is multiple choice, you are not typing and running programs during the test. Instead, expect to trace code by hand, predict output, identify the line that causes a problem, or choose the correct way to complete a snippet. That makes code reading the dominant skill. Candidates who only practice by writing and running code sometimes struggle here, because the exam rewards the ability to mentally execute a program without an interpreter. Running code in another website or program during the exam is explicitly prohibited, so that mental tracing habit needs to be built beforehand.
The Six Exam Topic Groups
CodeHS publishes six top-level topic groups for the certification. These are official exam-topic groupings, not a percentage-weighted blueprint and not a count of course modules. No official weighting has been verified, so treat all six as fair game and avoid assuming one dominates. For a deeper walkthrough, see CHS-JS1 Exam Domains 2026: Complete Guide to All 6 Content Areas.
Domain 1: Data Types and Operators
The foundation of everything else. You need to know how JavaScript represents values and how operators combine them.
- Distinguishing numbers, strings, and booleans
- Arithmetic, comparison, and logical operators
- Predicting the result of mixed expressions, including string concatenation behavior
- Understanding variables and how values are stored and updated
Domain 2: Conditionals
Decision-making logic. Questions here ask which branch of code runs for a given input.
- if, else if, and else structure
- Combining conditions with logical operators
- Tracing which block executes for specific values
- Spotting boundary-condition mistakes
Domain 3: Loops
Repetition and iteration, a frequent source of tracing questions.
- for and while loop mechanics
- Loop counters, start values, and stopping conditions
- Predicting the number of iterations and the final value of a variable
- Recognizing off-by-one errors and infinite loops
Domain 4: Program Structure
How code is organized into reusable, readable pieces.
- Defining and calling functions
- Parameters and return values
- Variable scope within and outside functions
- How program flow moves between functions
Domain 5: Error Handling
Anticipating and responding to things going wrong.
- Recognizing common kinds of errors in code
- Reading a snippet and identifying why it fails
- Understanding how a program can respond to unexpected conditions
Domain 6: Objects
Grouping related data and behavior together.
- Creating objects and accessing their properties
- Updating and adding properties
- Reading code that combines objects with the earlier concepts
How Vouchers, Attempts, and Fees Work
The registration model is voucher-based and tied closely to schools and districts. CodeHS provides school and district voucher pricing by direct quote, and no public numeric fee was verified, so you will not find a single sticker price to cite. If cost is your main question, the dedicated breakdown at CHS-JS1 Certification Cost 2026 explains how to think about it without relying on invented figures.
- One voucher, one attempt. Each purchased voucher permits a single exam attempt.
- Retakes are allowed. There is no numerical cap on retakes, but every additional attempt requires another purchased voucher.
- Vouchers expire. Unused school or district vouchers expire at the end of the contract term and do not roll over between school years.
That last point deserves attention. If your teacher or district buys a block of vouchers, they are tied to a contract period. A student who delays testing until a new school year may find that the original vouchers are gone. Scheduling the exam within the same contract window as your preparation avoids that problem. For scheduling specifics, see CHS-JS1 Exam Dates 2026.
Key Takeaway
Because retakes cost another voucher, treat your first attempt as the one that counts. Use practice questions to confirm you are consistently above the 60% line across all six topic groups before your teacher or proctor releases a voucher to you.
What Test Day Looks Like
Test day is governed by a set of integrity rules designed to keep the exam fair while remaining practical for classrooms and homes.
Integrity and monitoring
- You agree to an Honor Code before starting.
- Questions are randomly selected.
- Focus Mode blocks navigation to other CodeHS pages during the exam. It is not described as a system-wide browser lockdown, so it limits movement inside CodeHS rather than locking down your entire device.
- A teacher or authorized proctor monitors through the Proctor Dashboard.
What you may and may not use
CodeHS suggests having paper, a pencil, and a calculator. A JavaScript examination reference sheet is provided within the exam. Scratch paper is especially valuable for tracing loops and tracking variable values line by line.
Prohibited activities include using external websites, collaborating with others, copying or sharing exam questions, and running code in another website or program. Sharing questions afterward is as much a violation as looking things up during the test.
Accommodations
Extended-time and read-aloud accommodations are supported. Other requests require platform review, so anyone who needs something beyond those two should ask well ahead of the testing date rather than the day before.
Results, Certificates, and Validity
Results are released within 36 hours on school days, which means a Friday afternoon exam may not produce a result until after the weekend. You receive an overall score and a topic-level performance report. That report is useful whether you pass or not: it shows which of the six topic groups pulled your performance down, which is exactly the information you need if a retake becomes necessary.
Successful candidates receive a downloadable certificate. Earned certificates expire after 10 years, which is a long enough window that the credential will remain current throughout high school and well into college or early career stages, even if the underlying JavaScript ecosystem keeps evolving.
Who Benefits From This Credential
CHS-JS1 is an entry-level credential, so its value is best understood honestly. It signals foundational competence, not professional-level engineering ability. The people who get the most out of it tend to be:
- High school and middle school students completing a JavaScript course who want an external proof of skill for a portfolio, college application, or scholarship narrative.
- Students planning further study in computer science, web development, or related fields who want a documented starting point.
- Teachers and schools seeking a consistent way to demonstrate student outcomes in a computer science program.
On the employment side, be realistic. A Level 1 certificate is not a substitute for a portfolio or professional experience, and no reliable salary figures have been verified for this specific credential, so this article makes no earnings claims. If you are weighing the practical return, the analysis in Is the CHS-JS1 Certification Worth It? and the discussion in CHS-JS1 Jobs and CHS-JS1 Salary Guide are better places to explore how a credential like this fits into a longer path.
Preparing in a Domain-First Order
There are no certification prerequisites, so anyone can attempt the exam. CodeHS recommends the Introduction to Computer Science in JavaScript (Corgi) course as preparation, but it is a recommendation, not an eligibility requirement. There is also a matching Level 1 Certification Practice course listed in the CodeHS practice catalog. Neither of these creates additional exam domains; they simply help you rehearse the same six topic groups. For eligibility details, see CHS-JS1 Requirements 2026.
Rather than generic study advice, a sensible approach is to order your preparation by dependency. Each later topic leans on earlier ones, so a weak foundation shows up everywhere:
Data Types and Operators, then Conditionals
- Practice predicting the value of mixed expressions by hand
- Trace if/else chains with boundary values
- These two groups underpin every later question
Loops and Program Structure
- Trace loop counters on paper until it is automatic
- Practice function parameters, return values, and scope questions
- Combine loops inside functions to mimic exam-style snippets
Error Handling and Objects, then full review
- Read broken snippets and explain why they fail
- Work with object properties inside conditionals and loops
- Finish with timed sets of 45 questions in 90 minutes
The reasoning is simple: Objects and Error Handling questions often embed loops, conditionals, and operators, so saving them for last lets you practice everything together. For a fuller plan, consult the CHS-JS1 Study Guide 2026 and keep the CHS-JS1 Cheat Sheet nearby for last-minute review. When you are ready for realistic repetition, the CHS-JS1 practice tests let you rehearse the 45-question, timed format. If you are unsure how much effort to budget, How Hard Is the CHS-JS1 Exam? offers a grounded view of difficulty.
Common Mix-Ups to Avoid
- "60% is the pass rate." It is the passing score you need, not the share of candidates who pass. No official pass rate has been verified.
- "Focus Mode locks my whole computer." It blocks navigation to other CodeHS pages and is not described as a full browser lockdown. Rules against outside websites still apply regardless.
- "The six topic groups are weighted." They are unweighted official headings. Do not assume any one is worth more than the others.
- "I need the Corgi course to qualify." It is recommended, not required.
- "Unused vouchers carry over." They do not; they expire at the end of the contract term.
- "This is the same as Web Development Level 1." It is a separate credential. This certification targets JavaScript fundamentals specifically.
For additional angles on the terminology, the site's pages on What Is CHS-JS1 Certification? and CHS-JS1 Meaning cover related definitions, while CHS-JS1 Training discusses preparation resources.
Frequently Asked Questions
It covers six topic groups from the CodeHS JavaScript Level 1 exam overview: Data Types and Operators, Conditionals, Loops, Program Structure, Error Handling, and Objects. The groups are unweighted official headings rather than a percentage blueprint.
The exam has 45 multiple-choice questions and a 90-minute time limit. You must complete it in one sitting, and a score of 60% is required to pass.
Yes. There is no numerical limit on retakes, but each attempt uses one voucher, so every additional attempt requires purchasing another voucher through your school or district.
No. There are no certification prerequisites. The Introduction to Computer Science in JavaScript (Corgi) course is recommended preparation but is not an eligibility requirement.
Results are released within 36 hours on school days, with an overall score and topic-level report. Successful candidates receive a downloadable certificate that expires after 10 years.