SF JavaScript Dev I (Salesforce Certified JavaScript Developer I) — Free Online Mock Test

SF JavaScript Dev I exam at a glance

SF JavaScript Dev I full-length mock tests

Attempt 50 full-length SF JavaScript Dev I mock tests, each a distinct question set built on the real 60-question, 105-minute pattern — with instant scoring and section-wise analysis. The first 3 are free.

SF JavaScript Dev I key facts & eligibility

Who is eligible for SF JavaScript Dev I?

No formal prerequisite; one to two years of JavaScript development experience is recommended.

Last verified July 2026 against Salesforce — JavaScript Developer I. Always confirm current details on the official website before you register.

SF JavaScript Dev I section breakdown

The SF JavaScript Dev I mock test on Wrexa Edge replicates the real exam's section structure — same names, same question count per section, same time limits. No inter-section breaks — the timer runs continuously.

• SF JavaScript Dev I (60 Q)
  60 questions · 105 minutes · ~105 sec/question

SF JavaScript Dev I scoring & marking scheme

Strategy: SF JavaScript Dev I has no negative marking. Attempt every question — blank answers cost you potential marks but cannot pull your score down.

Scale: SF JavaScript Dev I (pass 700/1000).

How SF JavaScript Dev I is conducted

• Mode
  Proctored — Wrexa Edge mirrors this with a webcam-based proctoring flow (face detection, room scan, fullscreen lock, tab-switch detection).
• Test format
  Linear / fixed-form — every candidate sees the same number of questions per section.
• Backtracking
  Allowed — you can revisit and change answers within a section.
• Mark for review
  Available — flag tough questions and return to them before submitting the section.

SF JavaScript Dev I time strategy

With 60 questions in 105 minutes, you have about 105 seconds per question on average. Successful candidates aim for the following pacing on each section:

• SF JavaScript Dev I (60 Q)
  Target ~105 sec/question. If a question takes more than 158 seconds, mark for review and move on.

Wrexa Edge's analytics show your actual time-per-question after every mock so you can spot which sections you're losing time on.

SF JavaScript Dev I topics covered

Across the 50 Wrexa Edge variants of SF JavaScript Dev I, the following topics appear most often (sample distribution from one variant):

SF JavaScript Dev I (60 Q)

• JS — Arrays · 5
• JS — Event Loop · 5
• JS — Async · 3
• JS — Modules · 2
• JS — Prototypes · 2
• SDLC — Testing · 2
• SDLC — Versioning · 2
• JS — Scope · 2

SF JavaScript Dev I difficulty calibration

Advanced tier. Advanced-level: high-stakes exam with rigorous content depth. Expect 4-8 months of structured prep.

Salesforce · 60 Q in 105m. Core JavaScript — variables/types, functions, objects, async, DOM/events, debugging & testing (vendor-neutral JS). Pass 65%. · Official language: English.

Verified content — Wrexa Edge's SF JavaScript Dev I bank has been deeply curated with real exam-aligned content (estimated 100% syllabus coverage).

How Wrexa Edge prepares you for SF JavaScript Dev I

• Real test-day interface
  Our cert skin mirrors the actual SF JavaScript Dev I testing software — same timer, palette, tools, and navigation.
• 50 distinct variants
  3000 unique practice questions, each variant a fresh test — not just shuffled options.
• Detailed analytics
  Scaled score, section accuracy, topic-wise heatmap, time-per-question — see where to focus after every attempt.
• Spaced repetition (Notebook)
  Wrong answers and flagged questions flow into an SM-2 spaced-repetition deck so you actually retain what you learn.
• Optional proctoring
  Browser-based face-api detection (no install) — turn it on to simulate real SF JavaScript Dev I test-day conditions.
• Free to start
  No credit card. Sign up, pick a variant, and your first SF JavaScript Dev I mock starts in under a minute.

Expert take: what SF JavaScript Dev I really tests

The Salesforce JavaScript Developer I certification, from Salesforce, is a two-part credential for developers using JavaScript, including Lightning Web Components. It combines a proctored exam of 60 scored multiple-choice/multiple-select questions (plus up to 5 unscored) in 105 minutes with a passing score of 65%, and the Lightning Web Components Specialist superbadge (a hands-on Trailhead project). The two parts can be earned in any order, and completing both automatically awards the certification.

SF JavaScript Dev I study plan

A phase-by-phase roadmap from your first concept to test-ready. Stretch or compress each phase to fit the time you have before your attempt.

Where SF JavaScript Dev I can take you

A strong SF JavaScript Dev I result opens up these careers and higher-study paths:

• JavaScript developer
  Validates JavaScript and Lightning Web Components skills.
• Salesforce development
  A two-part credential: exam plus superbadge.

Best books & official prep for SF JavaScript Dev I

• JavaScript Developer I exam guide — Salesforce
  Official blueprint for the proctored exam.
• Lightning Web Components Specialist superbadge — Salesforce Trailhead
  The hands-on second part of the certification.

Official practice: Study core JavaScript for the proctored exam (pass mark 65%) and complete the Lightning Web Components Specialist superbadge on Trailhead; both are required.

Previous-year papers: Salesforce provides the exam guide and Trailhead modules; providers supply practice questions.

Frequently asked questions

What is the SF JavaScript Dev I exam pattern?

Salesforce Certified JavaScript Developer I contains 60 questions across 1 section: SF JavaScript Dev I (60 Q). Total duration is 105 minutes (about 105 seconds per question).

Does SF JavaScript Dev I have negative marking?

No — SF JavaScript Dev I has no negative marking. Each correct answer is worth 1 mark, so attempt every question.

How is SF JavaScript Dev I scored?

Scaled score range: 100 to 1000. SF JavaScript Dev I (pass 700/1000).

How can I practise SF JavaScript Dev I online for free?

Wrexa Edge gives you 3 free full-length SF JavaScript Dev I mock tests — with instant scoring, detailed explanations and analytics — plus 47 more with Pro. Start practising in under a minute, no card required.

What is the difficulty level of SF JavaScript Dev I?

SF JavaScript Dev I is rated Advanced difficulty on Wrexa Edge. Advanced-level: high-stakes exam with rigorous content depth. Expect 4-8 months of structured prep. Salesforce · 60 Q in 105m. Core JavaScript — variables/types, functions, objects, async, DOM/events, debugging & testing (vendor-neutral JS). Pass 65%. · Official language: English.

How long is the SF JavaScript Dev I exam?

SF JavaScript Dev I runs for 105 minutes total. On Wrexa Edge the timer is enforced exactly as on the real exam — including no inter-section breaks.

What topics are covered in SF JavaScript Dev I?

SF JavaScript Dev I is split into: SF JavaScript Dev I (60 Q). Each section is timed and weighted separately. Salesforce · 60 Q in 105m. Core JavaScript — variables/types, functions, objects, async, DOM/events, debugging & testing (vendor-neutral JS). Pass 65%. · Official language: English.

What tools or aids are allowed during SF JavaScript Dev I?

No special tools are required. Note: real exam is proctored — Wrexa Edge mirrors this with a webcam-based proctoring flow you can enable.

Is the SF JavaScript Dev I test adaptive?

No — SF JavaScript Dev I is a fixed-form (linear) test. Every candidate sees the same number of questions per section.

How many SF JavaScript Dev I mock tests does Wrexa Edge offer?

Wrexa Edge generates 50 distinct SF JavaScript Dev I variants — each with different question content, not just shuffled options — the first 3 free for everyone and 47 more with Pro. That's 3000 unique practice questions in the real test-day interface.

Is there a free SF JavaScript Dev I test series 2026?

Yes. The Wrexa Edge SF JavaScript Dev I test series for 2026 gives you 3 free full-length mock tests (50 in total) plus subject-wise and topic-wise tests — instant scoring and detailed analysis, no card required.

Are SF JavaScript Dev I previous year question–style papers included?

Every SF JavaScript Dev I mock is modelled on the official exam pattern and the style of previous years' papers — the same 60-question structure, sections and marking — so your practice mirrors the real paper you'll sit.

Which is the best free SF JavaScript Dev I mock test online?

Wrexa Edge's SF JavaScript Dev I mock test replicates the real exam interface, timing and marking scheme, with instant score, section-wise analysis and 50 fresh variants — a strong free choice for 2026 preparation.

Can I take the SF JavaScript Dev I mock test on mobile?

Yes. SF JavaScript Dev I mock tests run in any browser on mobile, tablet or desktop — no app or download needed. Start on your phone and your progress and analytics sync when you sign in.

What is the SF JavaScript Dev I syllabus?

The SF JavaScript Dev I syllabus maps to its 1 section: SF JavaScript Dev I (60 Q). Wrexa Edge's mock tests cover the complete syllabus topic by topic — see the topics-covered breakdown above — so you practise every area at real exam difficulty.

What is the eligibility for SF JavaScript Dev I?

No formal prerequisite; one to two years of JavaScript development experience is recommended. Wrexa Edge focuses on realistic SF JavaScript Dev I practice: 3 free full-length mocks in the exact exam pattern, ready whenever you are.

When is the SF JavaScript Dev I exam and how should I prepare?

Official SF JavaScript Dev I exam dates are announced by the conducting body for each cycle — check the latest notification for the current schedule. To be ready, follow a phased study plan and take full-length timed mocks; Wrexa Edge gives you 3 free SF JavaScript Dev I mocks with instant scoring so you can track your readiness week by week.

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