Exam format
Salesforce Certified JavaScript Developer I Exam Format
Everything the official exam blueprint specifies: question count, time limit, scoring and the weight each domain carries. The Salesforce Certified JavaScript Developer I exam validates a candidate's proficiency in modern JavaScript (ES6+). It focuses on the core mechanics of the language, including data structures, functional programming patterns, and asynchronous execution models. Beyond pure syntax, the exam evaluates the ability to interact with the Document Object Model (DOM) and handle browser-based events efficiently. It ensures developers can write clean, testable, and performant code, bridging the gap between standard web development and the specialized requirements of the Salesforce Lightning Web Components (LWC) framework. Candidates must demonstrate a deep understanding of how the JavaScript engine operates, from the event loop to scope management.
- 60 questions
- 105 min
- 65% to pass
- 7 domains
certilumExam facts at a glance
What we know about this exam, and where the information comes from.
| Specification | Value |
|---|---|
| Questions | 60 |
| Time limit | 105 minutes (105s per question) |
| Passing score | 65% |
| Domains | 7 |
| Level | Associate |
| Question bank here | 60 questions |
| Source | Certilum's own record — the vendor does not publish this figure |
Official domain weights
The percentage of the exam each domain carries. Weight your revision by these numbers, not by what you find hardest.
| Domain | Weight | Topics | Practice Qs |
|---|---|---|---|
| Testing | 7% |
| 4 |
| Browsers and Events | 17% |
| 10 |
| Server-side JavaScript | 8% |
| 5 |
| Asynchronous Programming | 13% |
| 8 |
| Debugging and Error Handling | 7% |
| 4 |
| Objects, Functions, and Classes | 25% |
| 15 |
| Variables, Types, and Collections | 23% |
| 14 |
The heaviest domain is Testing at 7%, and that is where lost points cost you the most. Certilum scores you per domain so you can see the difference between a knowledge gap and a formatting problem.
Note from the vendor record: Official Developer category price: USD 200 (JPY 30,000) tax not included, retake USD 100. Salesforce Certified JavaScript Developer I is listed among the Developer exams. Taxes collected by Pearson VUE. Official exam page
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Frequently asked questions
Everything you need to know about the Salesforce Certified JavaScript Developer I exam.