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Updated: Aug 01, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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Who should take the Salesforce JavaScript-Developer-I Exam
This course is designed for Javascript developers starting on the Salesforce platform who require programming customizations on front-end and back-end. There are no prerequisites for Salesforce JavaScript Developer I Exam. Typical job roles that align to the Salesforce Certified JavaScript Developer I are as follows:
- Technical Product Manager
- Front end developer
- Technical Project Manager
- JavaScript programmer
- Web application developer
- Software/backend developer
- Salesforce developer
- Full stack developer
- UI/UX Engineer
- Support engineer
Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Passing Score: | 65% |
| Available Languages: | English |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Exam Duration: | 105 minutes |
| Exam Format: | Multiple-choice, Multiple-select |
| Exam Price: | $200 USD |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Certificate Validity Period: | None (Credential does not expire) |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online (proctored via Pearson VUE) or On-site (at a Pearson VUE testing center) |
| Pre Condition: | None required. 1-2 years of JavaScript development experience (front-end and/or back-end) is strongly recommended. Note: To earn the full credential, candidates must also pass the Lightning Web Components Specialist Superbadge in addition to the JS-Dev-101 exam. |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi |
How to Study the Salesforce JavaScript-Developer-I Exam
The best study material one can get is the JavaScript-Developer-I practice exam dumps. To ensure good grades, do attempt the JavaScript-Developer-I practice exams. The JavaScript Developer I from Salesforce typically has 1-2 years of experience as a JavaScript developer with the following JavaScript topics.
Monitor (agnostic platform)
Discharge
Forms of data and operators
Objects & Arrays: Data Structures
Control of Mistake
Strings
Asynchronous Programming
Classes
Activities
Functions (more functions in higher order)
JavaScript on the backend
Scope of Variables
Modules
Conversion type (inclusive versus explicit)
Item Model Document
To prepare for this test, we advise a combination of practical experience, completion of training courses, pathways and self-study in the areas listed in the examination outline section of this examination guide.
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Console methods for debugging - Breakpoints and code inspection - Error handling techniques (try/catch/finally) - Custom error types |
| Variables, Types, and Collections | 23% | - Variable declarations and initialization - Primitive and complex data types - Strings, numbers, and dates - Truthy and falsy evaluations - JSON parsing and manipulation - Type coercion and conversion - Arrays and collections |
| Asynchronous Programming | 13% | - Callbacks - Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Async/Await syntax - Event loop and execution flow |
| Browser and Events | 17% | - Browser Developer Tools usage - Event propagation (bubbling and capturing) - DOM manipulation - Browser-specific APIs - Event handling and listeners - Interacting with forms and user input |
| Server Side JavaScript | 8% | - Node.js fundamentals - CLI commands - Server-side JavaScript implementations - Core Node.js modules - Package management (npm) |
| Objects, Functions, and Classes | 25% | - Variable scope and closures - Prototypal inheritance - ES6 classes and inheritance - Execution flow and context - Function declarations and expressions - Arrow functions - Modules and decorators - Object creation and manipulation - Higher-order functions |
| Testing | 7% | - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation - Test coverage and reliability |
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Online Test Engine supports offline practice, while the precondition is that you should run it with the internet at the first time.
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