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

  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Aug 12, 2026
  • Q & A: 149 Questions and Answers

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About Salesforce JavaScript-Developer-I Exam

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How to book the Salesforce JavaScript-Developer-I Exam

There are the following steps for registering the Salesforce JavaScript Developer I exam. Step 1: Visit Salesforce Exam Registration Step 2: Signup/Login to Salesforce account Step 4: Select Date, time and confirm with the payment method

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

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Salesforce JavaScript-Developer-I Certification leaning site Salesforce JavaScript-Developer-Is Certification resources

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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