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

  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Aug 11, 2026
  • Q & A: 149 Questions and Answers

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About Salesforce JavaScript-Developer-I Exam

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Topics of Salesforce JavaScript Developer I Exam

Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below concepts Salesforce JavaScript-Developer-I exam will include the following topics:

1. Variable, Types, and Collection: 23%

Scenario based coding Variables Creation and Initialization JSON object understanding

2. Object, Functions, and Classes: 25%

Implementation of different functions Understanding of different modules of Javascript Scope of variables and their execution flow

3. Browser and Events: 17%

Handling and propagation of events Development tools of browsers Understanding of browser specific APIs

4. Asynchronous Programming: 13%

Asynchrounous programming different concepts Monitoring and management of different loops

5. Server Side Javascript: 8%

Implementation of Node.js Understanding of Node.js CLI commands

6. Testing: 7%

Unit Testing effectiveness of different tests

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

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).

As an aspiring IT candidate, you are must desperate to want to pass JavaScript-Developer-I exam certification under all costs and conditions. While, our JavaScript-Developer-I free practice torrent will not only help you pass your exam, but also save your time and energy at the same time. Salesforce Developer JavaScript-Developer-I sure pass torrent is the latest and edited and checked by our professional experts, which always can cover all the topics in the actual test. With our JavaScript-Developer-I exam vce torrent, you will test your knowledge and skills, and know more about the actual test. You will not waste much time on several times for test. One time pass with Salesforce JavaScript-Developer-I free download dumps is the guarantee for all of you.

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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

Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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