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

"Salesforce Certified JavaScript Developer (JS-Dev-101)", also known as JavaScript-Developer-I exam, is a Salesforce Certification. With the complete collection of questions and answers, PrepAwayPDF has assembled to take you through 149 Q&As to your JavaScript-Developer-I Exam preparation. In the JavaScript-Developer-I exam resources, you will cover every field and category in Salesforce Developer Certification helping to ready you for your successful Salesforce Certification.

  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Certification Provider: Salesforce
  • Corresponding Certification: Salesforce Developer
  • Updated: Sep 21, 2026
  • No. of Questions: 149 Questions & Answers with Testing Engine
  • Download Limit: Unlimited

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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

In the era of informational globalization, the world has witnessed climax of science and technology development, and has enjoyed the prosperity of various scientific blooms. In 21st century, every country had entered the period of talent competition, therefore, we must begin to extend our Salesforce working skills, only by this can we become the pioneer among our competitors. At the same time, our competitors are trying to capture every opportunity and get a satisfying job. In this case, we need a professional JavaScript-Developer-I certification, which will help us stand out of the crowd and knock out the door of great company.

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Benefits in Obtaining Salesforce JavaScript-Developer-I Certification

With the introduction of the Lightning Experience by Salesforce, it is possible to develop cool, looking applications for a wide range of tasks. Admins have been able to create beautiful pages for their objects more than ever, with an interface entirely tailored for each user.For developers, the same application has never before been possible for Salesforce developers to create applications that stretch well beyond Salesforce's declarative features. It's all achieved with the use of a JavaScript application for Lightning & Lightning Web components.

The certification for JavaScript Developer I has just been released and fills a large gap in the certification list for Salesforce. Salesforce Developers who want to prove their Lightning skills, but also new entrants into the Salesforce community, are certified to demonstrate that they know what is relevant. A typical Salesforce 60 multi-choice test is split into two parts and is influenced by a super badge (Similar to Developer II certification).

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

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Server-Side JavaScript8%- Node.js fundamentals and runtime
- Module system and require/import
- Command-line tools and scripts
- Core Node.js modules
Topic 2: Testing7%- Unit testing concepts
- Test doubles and mocks
- Testing frameworks and assertions
- Code coverage and best practices
Topic 3: Browsers and Events17%- Window and document object properties
- Document Object Model (DOM) manipulation
- Script loading and execution order
- Browser APIs and Web Storage
- Event handling, propagation, and delegation
Topic 4: Objects, Functions, and Classes25%- Class syntax, inheritance, and prototypes
- Modules and imports/exports
- Decorators and advanced function patterns
- Object creation, properties, and methods
- Function definitions, parameters, and scope
- Closures and execution context
Topic 5: Asynchronous Programming13%- Async/await syntax
- Callbacks and callback hell
- Promises and chaining
- Fetch API and HTTP requests
- Event loop and micro/macro tasks
Topic 6: Debugging and Error Handling7%- Error types and exception handling
- Defensive programming practices
- Debugging tools and breakpoints
- Console methods and logging
Topic 7: Variables, Types, and Collections23%- Working with strings, numbers, dates, and booleans
- JSON parsing and usage
- Variable declaration and initialization
- Type coercion and conversion rules
- Array methods and data manipulation
- Truthy and falsy values

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