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Last Updated: Sep 08, 2026

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Salesforce JavaScript Developer roles are in great demand nowadays. The average salaries of Salesforce JavaScript Developer I exam Certified professional in:

  • United State - 129,630 USD
  • England - 60,200 POUND
  • Europe - 63,500 Euro

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

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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

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Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:

SectionWeightObjectives
Server-Side JavaScript8%- Module system and require/import
- Core Node.js modules
- Node.js fundamentals and runtime
- Command-line tools and scripts
Asynchronous Programming13%- Async/await syntax
- Event loop and micro/macro tasks
- Callbacks and callback hell
- Promises and chaining
- Fetch API and HTTP requests
Browsers and Events17%- Event handling, propagation, and delegation
- Browser APIs and Web Storage
- Document Object Model (DOM) manipulation
- Window and document object properties
- Script loading and execution order
Testing7%- Test doubles and mocks
- Code coverage and best practices
- Testing frameworks and assertions
- Unit testing concepts
Debugging and Error Handling7%- Debugging tools and breakpoints
- Error types and exception handling
- Defensive programming practices
- Console methods and logging
Variables, Types, and Collections23%- Working with strings, numbers, dates, and booleans
- Array methods and data manipulation
- Type coercion and conversion rules
- Variable declaration and initialization
- Truthy and falsy values
- JSON parsing and usage
Objects, Functions, and Classes25%- Function definitions, parameters, and scope
- Object creation, properties, and methods
- Class syntax, inheritance, and prototypes
- Modules and imports/exports
- Decorators and advanced function patterns
- Closures and execution context
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