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

JavaScript-Developer-I
  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Aug 30, 2026
  • Q & A: 149 Questions and Answers
  • PDF Version

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  • PDF Price: $59.99
  • Salesforce JavaScript-Developer-I Value Pack

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  • PDF Version + PC Test Engine + Online Test Engine (free)
  • Value Pack Total: $79.99

About Salesforce JavaScript-Developer-I Exam

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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

Introduction to Salesforce JavaScript Developer I Exam

The credential Salesforce Accredited JavaScript Developer I is meant for applicants who build JavaScript applications for the web stack on the front-end and/or back-end.This validates both key JavaScript expertise and functional skills for applicants, for example, Lightning Components Platform, and Lightning Web Component technology relevant to JavaScript. Lightning web elements are personalised HTML elements that are designed with traditional HTML and modern JavaScript.

The Salesforce JavaScript Developer I certification requires two parts: the multiple-choice test given by the JavaScript Developer I and the Superbadge Lightning Web Components. In any order, all these credentials can be accessed. A Salesforce Certified Javascript Developer I certification is immediately obtained by adding these two certificates. The qualification applicant for Salesforce JavaScript Accredited Developer I will use the JavaScript language to build front-end or back-end software in one or more frameworks. The applicant will plan, build and evaluate effective , safe and reusable solutions.

The candidate can use JavaScript-specific programming style patterns and can use CSS , HTML, and other languages for integrating JavaScript. With Lightning Web Components, any JavaScript developer can build on Salesforce easily. This means that millions of JavaScript developers around the world will code on Salesforce without learning anything new. Developers can create and deploy brand-new fast apps on Salesforce using the current Lightning Platform development services portfolio and the modern JavaScript language. Salesforce JavaScript Developer I Certificate from Salesforce is designed to help Salesforce partners, customers and employees working on JavaScript as well as the Lightning Component Platform, know-how and knowledge and creation of Lightning web components (LWC's).

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Average Salary for Salesforce JavaScript-Developer-I Exam Certified Professional

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

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

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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