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Salesforce Updated JavaScript-Developer-I Exam Blueprint, Syllabus and Topics

Salesforce Certified JavaScript Developer (JS-Dev-101)

Last Update Sep 21, 2025
Total Questions : 219

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Salesforce JavaScript-Developer-I Exam Overview :

Exam Name Salesforce Certified JavaScript Developer (JS-Dev-101)
Exam Code JavaScript-Developer-I
Official Information https://trailhead.salesforce.com/en/help?article=Salesforce-Certified-JavaScript-Developer-I-Exam-Guide
See Expected Questions Salesforce JavaScript-Developer-I Expected Questions in Actual Exam
Take Self-Assessment Use Salesforce JavaScript-Developer-I Practice Test to Assess your preparation - Save Time and Reduce Chances of Failure

Salesforce Javascript-Developer-I Exam Topics :

Section Weight Objectives
Variables, Types, and Collections 23%
  • Given a scenario, write code to create variables and initialize them correctly.
  • Given a business requirement, utilize strings, numbers, and dates effectively.
  • Given a scenario or example, demonstrate awareness of type coercion and its effects.
  • Given a specific scenario, distinguish truthy or falsey evaluations
  • Given a list of data, demonstrate data manipulation with arrays.
  • Given a JSON response, demonstrate how to operate the JSON object.
Objects, Functions, and Classes 25%
  • Given a business requirement, locate the best function implementation.
  • Given a business requirement, apply fundamentals of object implementation to solve the business requirement.
  • Given a business requirement, apply fundamentals of class implementation to solve the business requirement.
  • Given a JavaScript module, give examples of how to use the module.
  • Given a JavaScript decorator, give examples of how to use the decorator.
  • Given a block of code, analyze the variable scope and the execution flow.
Browser and Events 17%
  • Given a business requirement, utilize Events, event handlers and propagation.
  • Given a business requirement, evaluate and manipulate the DOM.
  • Given a scenario, utilize the Browser Dev Tools to investigate code behavior.
  • Given a scenario and requirements, utilize browser specific APIs.
Debugging and Error Handling 7%
  • Given a scenario, handle errors properly.
  • Given code to be debugged, use the console and breakpoints.
Asynchronous Programming 13%
  • Given a scenario, apply asynchronous programming concepts.
  • Given a scenario, use event loop and event monitor or determine loop outcomes.
Server Side JavaScript 8%
  • Given a scenario and requirements, infer which Node.js implementation is a good solution.
  • Given a scenario and requirements, infer which Node.js CLI command is a good solution.
  • Know the core Node.js modules and given requirements, infer which Node.js library/framework is a good solution.
  • Given a scenario and requirements, distinguish which Node.Js Package Management solution is the most fitting.
Testing 7%
  • With a block of code and the associated Unit Test, determine where the test is ineffective and modify it to make it more effective.

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