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Salesforce Certified JavaScript Developer (JS-Dev-101) : JavaScript-Developer-I Exam

JavaScript-Developer-I Exam Questions
  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Jul 29, 2026
  • Q & A: 149 Questions and Answers
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Salesforce JavaScript-Developer-I exam is a three-hour exam that consists of 60 multiple-choice questions. JavaScript-Developer-I exam is available in English and Japanese and can be taken either online or onsite. The passing score for the exam is 68%, and candidates are given immediate feedback on their results. JavaScript-Developer-I exam fee is $200, and candidates can retake the exam after 15 days if they fail.

Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

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Salesforce JavaScript-Developer-I exam covers a wide range of topics, including data modeling, Apex programming, JavaScript development, Visualforce development, and Lightning Component development. Candidates must demonstrate their proficiency in each of these areas to pass the exam. JavaScript-Developer-I exam also tests the candidate's ability to design and develop custom applications using Salesforce tools and technologies.

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Salesforce JavaScript-Developer-I exam demo

Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Objects, Functions, and Classes25%- Execution flow and context
- Variable scope and closures
- Function declarations and expressions
- Prototypal inheritance
- Object creation and manipulation
- Modules and decorators
- Higher-order functions
- ES6 classes and inheritance
- Arrow functions
Browser and Events17%- Event handling and listeners
- DOM manipulation
- Browser-specific APIs
- Interacting with forms and user input
- Browser Developer Tools usage
- Event propagation (bubbling and capturing)
Testing7%- Test effectiveness evaluation
- Test coverage and reliability
- Writing and modifying unit tests
- Unit testing concepts
Asynchronous Programming13%- Asynchronous patterns for business requirements
- Callbacks
- Promises (creation, chaining, error handling)
- Async/Await syntax
- Event loop and execution flow
Debugging and Error Handling7%- Breakpoints and code inspection
- Custom error types
- Error handling techniques (try/catch/finally)
- Console methods for debugging
Server Side JavaScript8%- CLI commands
- Core Node.js modules
- Server-side JavaScript implementations
- Package management (npm)
- Node.js fundamentals
Variables, Types, and Collections23%- Type coercion and conversion
- Primitive and complex data types
- Arrays and collections
- Strings, numbers, and dates
- JSON parsing and manipulation
- Truthy and falsy evaluations
- Variable declarations and initialization

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