Purchase Salesforce : JavaScript-Developer-I Exam Materials and then pass exam easily
Updated: Aug 29, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Exam Price: | $200 USD |
| Available Languages: | English |
| Exam Duration: | 105 minutes |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Exam Format: | Multiple-choice, Multiple-select |
| Certificate Validity Period: | None (Credential does not expire) |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online (proctored via Pearson VUE) or On-site (at a Pearson VUE testing center) |
| Pre Condition: | None required. 1-2 years of JavaScript development experience (front-end and/or back-end) is strongly recommended. Note: To earn the full credential, candidates must also pass the Lightning Web Components Specialist Superbadge in addition to the JS-Dev-101 exam. |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi |
What is the duration, language, and format of Salesforce JavaScript-Developer-I Exam
- There is a time limit of 105 minutes for the exam.
- Passing score 65%
- The type of questions is Multiple Choice and situation-based questions.
- This exam is offered in only English.
- This exam consists of 60 questions
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Objects, Functions, and Classes | 25% | - Arrow functions - Execution flow and context - Object creation and manipulation - ES6 classes and inheritance - Variable scope and closures - Function declarations and expressions - Modules and decorators - Prototypal inheritance - Higher-order functions |
| Topic 2: Variables, Types, and Collections | 23% | - Variable declarations and initialization - Truthy and falsy evaluations - Arrays and collections - Strings, numbers, and dates - Primitive and complex data types - JSON parsing and manipulation - Type coercion and conversion |
| Topic 3: Debugging and Error Handling | 7% | - Console methods for debugging - Breakpoints and code inspection - Custom error types - Error handling techniques (try/catch/finally) |
| Topic 4: Testing | 7% | - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation - Test coverage and reliability |
| Topic 5: Server Side JavaScript | 8% | - Package management (npm) - Core Node.js modules - CLI commands - Node.js fundamentals - Server-side JavaScript implementations |
| Topic 6: Browser and Events | 17% | - Browser-specific APIs - Interacting with forms and user input - Event propagation (bubbling and capturing) - Browser Developer Tools usage - DOM manipulation - Event handling and listeners |
| Topic 7: Asynchronous Programming | 13% | - Event loop and execution flow - Asynchronous patterns for business requirements - Async/Await syntax - Promises (creation, chaining, error handling) - Callbacks |
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