Learn with Salesforce : JavaScript-Developer-I training material for 100% pass
Updated: Oct 06, 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 |
| Certificate Validity Period: | None (Credential does not expire) |
| Available Languages: | English |
| Passing Score: | 65% |
| Exam Format: | Multiple-select, Multiple-choice |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Exam Price: | $200 USD |
| Exam Duration: | 105 minutes |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| 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 |
How to Study the Salesforce JavaScript-Developer-I Exam
The best study material one can get is the JavaScript-Developer-I practice exam dumps. To ensure good grades, do attempt the JavaScript-Developer-I practice exams. The JavaScript Developer I from Salesforce typically has 1-2 years of experience as a JavaScript developer with the following JavaScript topics.
Discharge
Item Model Document
Objects & Arrays: Data Structures
Asynchronous Programming
Conversion type (inclusive versus explicit)
Functions (more functions in higher order)
JavaScript on the backend
Forms of data and operators
Scope of Variables
Control of Mistake
Modules
Monitor (agnostic platform)
Classes
Activities
Strings
To prepare for this test, we advise a combination of practical experience, completion of training courses, pathways and self-study in the areas listed in the examination outline section of this examination guide.
Who should take the Salesforce JavaScript-Developer-I Exam
This course is designed for Javascript developers starting on the Salesforce platform who require programming customizations on front-end and back-end. There are no prerequisites for Salesforce JavaScript Developer I Exam. Typical job roles that align to the Salesforce Certified JavaScript Developer I are as follows:
- Technical Product Manager
- Software/backend developer
- Support engineer
- JavaScript programmer
- UI/UX Engineer
- Web application developer
- Front end developer
- Salesforce developer
- Full stack developer
- Technical Project Manager
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Difficulty in Writing of Salesforce JavaScript-Developer-I Exam
As Javascript development observed in nearly all organizations, Salesforce JavaScript-Developer-I is the most successful qualification candidates can get on their resume. Professionals have therefore been known to demonstrate concern. But this JavaScript-Developer-I can be very easy to clear if practitioners study with JavaScript-Developer-I exam dumps and then take the JavaScript-Developer-I practice exams. However, with accurate focusing and proper planning content, candidates will clear the test. With the aid of these materials, aspirants get reasonable idea about the kind of questions they pose in actual certification, the certification questions provides the most-represented JavaScript-Developer-I practice exams. The Salesforce experts check Exam4Labs JavaScript-Developer-I exam dumps. Certification questions also include a test for practise and is an ideal forum for checking the information achieved.
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Event loop and execution flow - Asynchronous patterns for business requirements - Async/Await syntax - Callbacks |
| Topic 2: Debugging and Error Handling | 7% | - Console methods for debugging - Breakpoints and code inspection - Error handling techniques (try/catch/finally) - Custom error types |
| Topic 3: Server Side JavaScript | 8% | - Package management (npm) - Node.js fundamentals - Server-side JavaScript implementations - CLI commands - Core Node.js modules |
| Topic 4: Browser and Events | 17% | - Event handling and listeners - Browser Developer Tools usage - Event propagation (bubbling and capturing) - Browser-specific APIs - Interacting with forms and user input - DOM manipulation |
| Topic 5: Testing | 7% | - Unit testing concepts - Writing and modifying unit tests - Test coverage and reliability - Test effectiveness evaluation |
| Topic 6: Objects, Functions, and Classes | 25% | - Modules and decorators - Prototypal inheritance - Execution flow and context - Object creation and manipulation - Arrow functions - Higher-order functions - ES6 classes and inheritance - Function declarations and expressions - Variable scope and closures |
| Topic 7: Variables, Types, and Collections | 23% | - Strings, numbers, and dates - JSON parsing and manipulation - Type coercion and conversion - Truthy and falsy evaluations - Primitive and complex data types - Variable declarations and initialization - Arrays and collections |
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