- CHS-JS1 refers to the CodeHS JavaScript Level 1 Certification, issued and administered by CodeHS.
- The exam has 45 multiple-choice questions, a 90-minute limit, and a 60% passing score.
- Six official topic groups: Data Types and Operators, Conditionals, Loops, Program Structure, Error Handling, Objects.
- Each voucher covers one attempt; every retake requires another purchased voucher.
What the Code Actually Means
If you have landed on this page searching for the meaning of "CHS-JS1," the answer on this site is specific: it is shorthand for the CodeHS JavaScript Level 1 Certification. "CHS" points to CodeHS, the platform that builds and delivers the exam. "JS" is JavaScript, the language being tested. "1" marks the entry level of the JavaScript certification track.
That is the whole decoding. The label is a convenient abbreviation rather than an official exam code printed by CodeHS, whose own title for the credential is "JavaScript Level 1 Certification." We use CHS-JS1 throughout this site so the topic is easy to search for and easy to refer to in study materials.
If you want a quick orientation to the credential itself, our overview pages What Is CHS-JS1? and CHS-JS1 Certification cover the basics from slightly different angles. This article focuses on the meaning of the label and everything packed behind it.
What CHS-JS1 Is Not
Acronyms get reused, and a short string like this one can collide with unrelated credentials in other fields. To keep things clear, here is what the CodeHS credential is and is not:
- It is a JavaScript programming exam delivered through the CodeHS Certifications app.
- It is not a course final exam. It is a standalone certification exam.
- It is not Web Development Level 1, which is a separate certification.
- It is not a teacher microcredential. It is aimed at students demonstrating JavaScript fundamentals.
The Exam Behind the Name
Understanding the format is part of understanding what the label stands for. The CodeHS JavaScript Level 1 exam is a timed, online, multiple-choice assessment.
| Feature | CHS-JS1 (CodeHS JavaScript Level 1) |
|---|---|
| Question count | 45 multiple-choice questions |
| Time limit | 90 minutes, one sitting |
| Passing score | 60% |
| Delivery | Online, at home or at school |
| Monitoring | Teacher or authorized proctor via the CodeHS Certifications app and Proctor Dashboard |
| Question selection | Randomly selected questions |
| Reference material | JavaScript examination reference sheet provided |
| Prerequisites | None |
Because every question is multiple choice, you are not writing a full program from scratch. You are reading code, predicting output, spotting bugs, and choosing the correct construct. That makes careful code tracing the central skill. For a candid look at what that feels like in practice, see How Hard Is the CHS-JS1 Exam?.
On the passing score: 60% is the threshold you must reach, not a statistic about how many candidates succeed. No official cohort pass rate has been verified, so be skeptical of any site quoting one. Our article on the CHS-JS1 passing score explains how to think about the threshold, and CHS-JS1 Pass Rate explains what can and cannot be said about outcomes.
The Six Domains Under the Label
The "JavaScript Level 1" in the name is defined by six official topic groups from the CodeHS exam overview. They are listed without percentage weights, so treat them as a map of content rather than a weighted blueprint. They are also exam-topic groups, not a count of course modules.
Domain 1: Data Types and Operators
The foundation of everything else on the exam.
- Distinguishing numbers, strings, and booleans, and predicting what an expression evaluates to
- Arithmetic, comparison, and logical operators, including how operator behavior changes with different types
- Variable declaration and assignment, and reading values after several reassignments
Domain 2: Conditionals
Decision-making logic, tested largely through tracing.
- if, else if, and else chains, and which branch actually executes for a given input
- Combining conditions with logical operators and spotting boundary-value traps
- Reading nested conditionals without losing track of scope
Domain 3: Loops
Repetition and the counting errors that come with it.
- for and while loops, including how many times a body runs
- Loop variables, update expressions, and termination conditions
- Off-by-one reasoning and spotting loops that never end
Domain 4: Program Structure
How code is organized into reusable, readable pieces.
- Functions: parameters, return values, and what a call produces
- Understanding how pieces of a program fit together and in what order they run
- Telling apart code that prints a value from code that returns one
Domain 5: Error Handling
Recognizing and responding to things going wrong.
- Identifying the kinds of mistakes that stop or derail a program
- Reading code to determine where a failure would occur
- Understanding how a program can respond to errors rather than crash
Domain 6: Objects
Grouping related data and behavior together.
- Creating objects and reading or updating their properties
- Accessing values with dot and bracket notation
- Predicting results when code modifies an object
For a deeper walk through each area, read CHS-JS1 Exam Domains: Complete Guide to All 6 Content Areas. For a condensed review, the CHS-JS1 cheat sheet collects the must-know facts on one page.
Vouchers, Proctoring, and Test-Day Rules
Part of what CHS-JS1 means in practice is a particular way of accessing and sitting the exam. It runs on vouchers, and the rules around them differ from a typical walk-in test.
How access works
- CodeHS provides school and district voucher pricing by direct quote. No public numeric fee has been verified, so ask your teacher or CodeHS rather than trusting a figure from a third-party page.
- Each purchased voucher permits one attempt.
- Unused school or district vouchers expire at the end of the contract term and do not roll over between school years.
Our CHS-JS1 certification cost article breaks down how to think about pricing without inventing numbers, and CHS-JS1 Requirements covers eligibility in detail. The short version: there are no certification prerequisites. The CodeHS course Introduction to Computer Science in JavaScript (Corgi) is recommended preparation, not a requirement.
How the exam is monitored
- You can test at home or at school, with a teacher or authorized proctor monitoring through the CodeHS Certifications app and Proctor Dashboard.
- The exam must be completed in one sitting.
- An Honor Code applies, and questions are randomly selected.
- Focus Mode blocks navigation to other CodeHS pages. It is not described as a system-wide browser lockdown, so do not assume it polices everything else on your device. The rules still prohibit outside help.
What is and is not allowed
- Allowed: the provided JavaScript examination reference sheet; paper, a pencil, and a calculator as suggested by CodeHS.
- Prohibited: external websites, collaboration, copying or sharing exam questions, and running code in another website or program.
That last point matters for how you practice. On exam day you cannot paste a snippet into a separate editor to see what it prints, so your ability to trace code by hand is the real test. Extended-time and read-aloud accommodations are supported; other requests require platform review.
Key Takeaway
Practice without a code runner. If you rely on executing code to learn its output, you will be underprepared for an exam where running code elsewhere is prohibited. Trace by hand with paper, then verify afterward.
Results, Certificates, and Retakes
Results are released within 36 hours on school days. You receive an overall score along with a topic-level performance report, which is useful because it shows which of the six domains cost you points. Successful candidates receive a downloadable certificate, and earned certificates expire after 10 years.
If you do not reach 60%, there is no numerical cap on retakes. The catch is practical rather than rule-based: every additional attempt requires another purchased voucher, so a retake depends on your school or district having one available. Use the topic-level report to target your weakest domain before asking for another attempt. If you are unsure about timing, CHS-JS1 Exam Dates explains how scheduling works around your class and proctor availability.
Who Uses the Credential and What It Signals
The audience for this certification is mostly students, particularly those in CodeHS classes, along with the teachers and schools that administer it. It verifies that a learner can read and reason about foundational JavaScript, which is useful as a portfolio or resume line for early-stage learners.
Be realistic about its weight. It is an entry-level, multiple-choice credential, so it signals fundamentals rather than job-ready software engineering. We do not publish salary figures or hiring statistics because none have been verified for this credential. If you are weighing it against your goals, our pieces on whether the certification is worth it, the salary guide, and CHS-JS1 jobs discuss the value qualitatively and honestly.
Sequencing Your Preparation by Domain
Because the exam is six topic groups with no published weights, a sensible plan builds in dependency order: early domains supply the vocabulary that later ones assume. Here is one way to sequence a six-week run, tied directly to the domains:
Data Types and Operators
- Hand-evaluate expressions mixing numbers, strings, and booleans
- Drill operator behavior until predictions are automatic
Conditionals
- Trace if/else if/else chains with boundary inputs
- Practice combining conditions with logical operators
Loops
- Count iterations by hand and check termination
- Hunt for off-by-one errors in sample code
Program Structure
- Trace function calls, parameters, and return values
- Separate printing from returning
Error Handling and Objects
- Identify where code would fail and how it could respond
- Read and modify object properties with dot and bracket notation
Mixed Timed Practice
- Take full-length sets under a 90-minute limit using only paper and the reference sheet
- Revisit whichever domain your results flag as weakest
For a fuller plan, see the CHS-JS1 Study Guide, and when you are ready to test yourself under realistic conditions, try the CHS-JS1 practice tests and review the explanations on anything you miss. If you want training resources rather than a schedule, CHS-JS1 Training lists options.
Frequently Asked Questions
On this site it means the CodeHS JavaScript Level 1 Certification: "CHS" for CodeHS, "JS" for JavaScript, and "1" for the entry level. The official credential title from CodeHS is "JavaScript Level 1 Certification."
The exam has 45 multiple-choice questions and a 90-minute time limit. It must be completed in a single sitting, and you need 60% to pass.
No. There are no certification prerequisites. Introduction to Computer Science in JavaScript (Corgi) is recommended preparation, but it is not an eligibility requirement.
Yes. There is no numerical limit on retakes, but each voucher covers one attempt, so every retake requires another purchased voucher. Unused school or district vouchers expire at the end of the contract term.
Earned certificates expire after 10 years. Results arrive within 36 hours on school days, and successful candidates can download their certificate.
For related explanations of the same label, you can also read What Does CHS-JS1 Stand For? and What Is CHS-JS1 Certification?.