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Exam Code: DEX-450
Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developer

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DEX-450

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Updated: Sep 17, 2026

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Salesforce DEX-450 exam consists of 60 multiple-choice questions and candidates have 105 minutes to complete it. DEX-450 exam covers a wide range of topics, including Apex classes and triggers, Visualforce pages and components, Lightning components, and web services. To pass the exam, candidates must score at least 68% (41 out of 60 questions) and the exam fee is $200.

Reference: https://trailhead.salesforce.com/en/academy/classes/dex450-build-applications-programmatically-on-the-salesforce-platform/

The DEX-450 exam covers various topics such as Apex programming concepts, Visualforce markup language, Lightning components, debugging and testing, and deployment. DEX-450 exam consists of 60 multiple-choice questions, and candidates are given 105 minutes to complete it. It is important to note that the DEX-450 exam is one of the prerequisites for the Salesforce Certified Platform Developer II certification. Programmatic Development using Apex and Visualforce in Lightning Experience certification is highly valued in the industry, as it is a testament to the candidate's ability to design and develop complex applications on the Salesforce platform.

Salesforce DEX-450 Exam Overview:

Certification Vendor:Salesforce
Exam Name:Programmatic Development using Apex and Visualforce in Lightning Experience
Exam Number:DEX-450
Related Certifications:Platform Developer II (PDII)
Salesforce Certified Administrator
Exam Price:$200 USD
Exam Duration:120 minutes
Exam Format:Multiple Select, Multiple Choice
Passing Score:68%
Available Languages:English
Certificate Validity Period:2 years (for certification)
Real Exam Qty:60
Sample Questions:Salesforce DEX-450 Sample Questions
Exam Way:In-person testing center or online proctored exam
Pre Condition:No formal prerequisites, but recommended: 1-2 years Apex development experience, completion of Salesforce Developer Beginner and Intermediate Trailhead modules
Official Syllabus URL:https://trailhead.salesforce.com/credentials/platform-developer-exam

To prepare for the Salesforce DEX-450 exam, developers should have a strong understanding of the Salesforce platform and its various components. They should be familiar with the Apex programming language, as well as the Visualforce framework and Lightning Components. Additionally, developers should be proficient in using development tools such as the Salesforce Developer Console and the Force.com IDE. By mastering these skills and preparing thoroughly for the exam, developers can increase their chances of passing the Salesforce DEX-450 certification and advancing their careers in programmatic development on the Salesforce platform.

Salesforce DEX-450 exam covers a range of topics related to programmatic development, including Apex programming language, Visualforce framework, Lightning components, and Lightning Web Components. Developers who pass DEX-450 exam can demonstrate their ability to design, develop, and deploy custom applications on the Salesforce platform using these tools and technologies. Programmatic Development using Apex and Visualforce in Lightning Experience certification is a valuable asset for developers who want to advance their career in Salesforce development and become a trusted advisor to their clients.

Salesforce DEX-450 Exam Syllabus Topics:

SectionWeightObjectives
Working with Data - SOQL and SOSL15%- SOSL (Salesforce Object Search Language)
  • 1. Returning sObjects from SOSL
  • 2. SOSL syntax and use cases
- SOQL (Salesforce Object Query Language)
  • 1. Basic SOQL queries
  • 2. Query options (LIMIT, ORDER BY, WHERE)
  • 3. Relationship queries (parent-child, child-parent)
  • 4. Aggregate functions (COUNT, SUM, AVG, MIN, MAX)
Visualforce Pages8%- VF Standard Components
  • 1. , ,
  • 2. Action methods and pageReference
  • 3. ,
- VF Page Basics
  • 1. component structure
  • 2. Visualforce expressions
  • 3. Controllers and controller extensions
Apex Classes and Interfaces12%- Apex Interfaces
  • 1. Interface definition and implementation
  • 2. When to use interfaces
- Apex Classes
  • 1. Class structure (attributes, methods, constructors)
  • 2. Access modifiers (public, private, protected, global)
  • 3. Inheritance and virtual/abstract classes
Apex Transaction Management10%- Governor Limits
  • 1. CPU time and heap size limits
  • 2. SOQL query limits
  • 3. DML statement limits
- Transaction Control
  • 1. Database methods with allOrNone parameter
  • 2. System.debug() usage
  • 3. Savepoint and rollback
Apex Fundamentals10%- Apex Primitives
  • 1. ID and sObject types
  • 2. Date, Datetime, Time classes
  • 3. Integer, Double, Long, String, Boolean types
- Apex Basics
  • 1. Apex operators and control flow statements
  • 2. Using SOQL to query Salesforce data
  • 3. DML operations (insert, update, delete, etc.)
  • 4. Apex variables and data types
Asynchronous Apex10%- Batch Apex
  • 1. Database.Stateful
  • 2. start(), execute(), and finish() methods
  • 3. Database.Batchable interface
- Future Methods
  • 1. @future annotation
  • 2. AsyncRequestLimit exceeded handling
Apex Triggers12%- Trigger Syntax and Context Variables
  • 1. Trigger.old and Trigger.new context variables
  • 2. Trigger events (before insert, after insert, etc.)
  • 3. Trigger.newMap and Trigger.oldMap
- Trigger Best Practices
  • 1. Handler class patterns
  • 2. Recursive trigger prevention
  • 3. One trigger per object pattern
Apex Testing13%- Test Classes
  • 1. @isTest annotation
  • 2. Test data creation methods
  • 3. Test.startTest() and Test.stopTest()
- Testing Best Practices
  • 1. Using seeAllData=false for isolated tests
  • 2. Coverage requirements (75% for deployment)
  • 3. Assert statement usage

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