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Updated: Jul 27, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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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:
- Europe - 63,500 Euro
- England - 60,200 POUND
- United State - 129,630 USD
How to Prepare for Salesforce JavaScript Developer I Exam
Preparation Guide for Salesforce JavaScript Developer I Exam
Introduction
Salesforce is a solution for managing customer relationships that unite customers and companies. This is an interactive CRM platform that provides a single, shared view of every client in all the divisions including marketing, distribution, exchange, and operation. Provide the clients with the individual experience Salesforce demand 360 product via the Integrated CRM Platform. It delivers solid and related goods to boost marketing, revenue, exchange, operation, IT, and more. Salesforce is a digital cloud computing (SaaS) firm specializing in the management of client relationships (CRMs). There was a mistake. The app is now the number one of consumer satisfaction and allows organizations to track customer behavior, advertise to consumers, and more. Salesforce is common because it is bundled with features such as contact management, workflow development, task management, incentive monitoring, teamwork tools, customer experience tools, analytics, and interactive, smartphone dashboard.
Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
| Exam Name: | Salesforce Certified JavaScript Developer I Exam |
| Exam Number: | JS-Dev-101 / JavaScript-Developer-I |
| Exam Format: | Multiple-choice, Multiple-select |
| Exam Price: | USD 200 (+ applicable taxes) |
| Available Languages: | English, Japanese |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Passing Score: | 65% |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Exam Duration: | 105 minutes |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Lightning Web Components Specialist |
| Recommended Training: | Salesforce JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; 1–2 years of JavaScript development experience recommended |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascript-developer-i |
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
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 |
|---|---|---|
| Variables, Types, and Collections | 23% | - Array methods and data manipulation - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Variable declaration and initialization - JSON parsing and usage - Type coercion and conversion rules |
| Server-Side JavaScript | 8% | - Core Node.js modules - Module system and require/import - Command-line tools and scripts - Node.js fundamentals and runtime |
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Console methods and logging - Defensive programming practices - Error types and exception handling |
| Asynchronous Programming | 13% | - Async/await syntax - Promises and chaining - Event loop and micro/macro tasks - Fetch API and HTTP requests - Callbacks and callback hell |
| Testing | 7% | - Code coverage and best practices - Unit testing concepts - Test doubles and mocks - Testing frameworks and assertions |
| Objects, Functions, and Classes | 25% | - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns - Object creation, properties, and methods - Function definitions, parameters, and scope - Closures and execution context - Modules and imports/exports |
| Browsers and Events | 17% | - Script loading and execution order - Event handling, propagation, and delegation - Browser APIs and Web Storage - Document Object Model (DOM) manipulation - Window and document object properties |
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Frequently Asked Questions
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Online Test Engine supports offline practice, while the precondition is that you should run it with the internet at the first time.
Self Test Engine is suitable for windows operating system, running on the Java environment, and can install on multiple computers.
PDF Version: can be read under the Adobe reader, or many other free readers, including OpenOffice, Foxit Reader and Google Docs.
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