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

JavaScript-Developer-I real exams

Exam Code: JavaScript-Developer-I

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

Updated: Jul 23, 2026

Q & A: 149 Questions and Answers

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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:

SectionObjectives
Topic 1: Testing and Debugging- Unit testing principles
- Debugging techniques and tools
Topic 2: Browser and DOM Interaction- Event handling and propagation
- DOM manipulation and traversal
- Browser APIs (fetch, storage, timers)
Topic 3: Salesforce Platform Integration- Lightning Web Components (LWC) JavaScript usage
- Security considerations in Salesforce JavaScript
- Calling Apex methods from JavaScript
Topic 4: JavaScript Language Fundamentals- ES6+ syntax and features
- Data types, variables, and operators
- Functions, scope, and closures
Topic 5: Asynchronous JavaScript- Event loop and concurrency model
- Error handling in async workflows
- Promises and async/await

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