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

JavaScript-Developer-I real exams

Exam Code: JavaScript-Developer-I

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

Updated: Sep 08, 2026

Q & A: 149 Questions and Answers

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

What is the duration, language, and format of Salesforce JavaScript-Developer-I Exam

  • The type of questions is Multiple Choice and situation-based questions.
  • There is a time limit of 105 minutes for the exam.
  • This exam is offered in only English.
  • Passing score 65%
  • This exam consists of 60 questions

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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