About the Salesforce Certified JavaScript Developer I Certification Exam

Salesforce Certified JavaScript Developer I exam consists of two parts, the Lightning Web Components Specialist Superbadge and the JavaScript Developer I proctored multiple-choice exam. These two credentials can be earned in any sequence. The combination of both of these credentials earns the Salesforce Certified JavaScript Developer I Certification.

Salesforce Certified JavaScript Developer I Certification Exam Guide

Salesforce Certified JavaScript Developer I Exam Guide

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Study for the Salesforce JavaScript Developer I Exam

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Prepare for your Salesforce JavaScript Developer I Credential

Important Topics

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.

How to get a free Salesforce Certified JavaScript Developer I Certification Voucher?

You could earn a free voucher to take the Javascript Developer I Certification Exam.

A certified JavaScript Developer I has the skillset to create front-end and/or back-end JavaScript applications for the web stack, and works with JavaScript-related technologies like Lightning Web Components.

To be eligible, you must:

  1. Be employed by a valid, legal Salesforce partner in good standing.
  2. Join the Official: Javascript Partner Community (log inrequired).
  3. Complete the Lightning Web Components Superbadge.


How to request a voucher?
After you’ve determined eligibility, request a voucher in the Official: Javascript Partner Community. You’ll find the “Voucher Request Form” in the left navigation bar. Make sure you share the same email address used in Trailhead so Salesforce can validate the Superbadge completion to qualify for a voucher.

This offer is valid for a limited period only!

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