Salesforce JavaScript Developer I (JSD-401) Exam – 2025 Guide
The Salesforce Certified JavaScript Developer I (exam code JSD-401) validates your JavaScript expertise in the context of Salesforce development — specifically Lightning Web Components, Aura components, and JavaScript integration patterns.
JSD-401 Exam Quick Facts
- Questions: 60 multiple-choice
- Duration: 105 minutes
- Passing score: 65%
- Fee: $200 USD
JSD-401 Exam Topic Breakdown
- Variables, Data Types and Collections (23%)
- Objects, Functions and Classes (22%)
- Browser and Events (17%)
- Debugging and Error Handling (7%)
- Asynchronous Programming (8%)
- Server-Side JavaScript (3%)
- Testing (10%)
- JavaScript Environments (10%)
What Makes the JS Developer I Exam Unique
Unlike most Salesforce exams, the JavaScript Developer I is heavily focused on core JavaScript fundamentals — not just LWC-specific patterns. Expect questions on closures, prototypal inheritance, promises, async/await, and the event loop. Many Salesforce developers underestimate this exam because they assume it’s just about LWC.
Key JavaScript Concepts to Master
- Closures and the scope chain
- Prototypal inheritance vs class syntax
- The event loop, microtask queue, and macrotask queue
- Promises, async/await, and error handling with try/catch
- Array methods: map, filter, reduce, forEach
- Destructuring, spread/rest operators, and template literals
- LWC-specific: lifecycle hooks, wire service, @api, @track
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Frequently Asked Questions
How long does it take to prepare for the Salesforce JavaScript Developer I Dumps?
Most candidates need 4-8 weeks at 10-15 hours per week to prepare. Using Trailhead combined with Dumpsforce practice dumps significantly accelerates preparation.
What is the passing score for the Salesforce JavaScript Developer I Dumps?
Most Salesforce exams require 65-67% to pass. Check the official Salesforce exam guide for the exact score. Dumpsforce practice dumps mirror the real exam to help you hit the required mark.
Are Dumpsforce practice questions updated for 2025?
Yes — Dumpsforce updates all practice dumps within weeks of each Salesforce release (Spring, Summer, Winter). All questions reflect current 2025 exam content.
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Yes. Dumpsforce offers a 100% money-back guarantee. If you study with our practice dumps and don’t pass your exam, you receive a full refund.
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Yes — every Dumpsforce product page includes 5 free demo questions. No account required. Try before you buy on any Salesforce certification page at Dumpsforce.com.
