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Certification Practice / JavaScript Developer

JavaScript Developer

OpenJS LFJ-101

Validates JavaScript fundamentals for modern web development, including language syntax, functions, objects, DOM, events, asynchronous programming, modules, and browser APIs.

Duration
60 Minutes
Questions
40 Questions
Passing Score
70%
Exam Cost
Varies by region
Progress

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Practice Tests
01
Recommended

Practice Test 1

Covers JavaScript syntax, variables, functions, scope, arrays, objects, DOM basics, and events.

40 questions 60 min
Start Test
02

Practice Test 2

Advanced practice covering async JavaScript, promises, modules, browser APIs, errors, and modern ES features.

40 questions 60 min
Start Test
Exam Domains & Weightage
Language Fundamentals
Core exam area
Variables - data types - operators - control flow - functions - scope
Objects, Arrays & Built-in APIs
Core exam area
Objects - prototypes - arrays - strings - dates - JSON - destructuring
DOM, Events & Browser APIs
Web platform area
DOM selection - event handling - forms - storage - fetch - browser runtime
Async JavaScript & Modules
Modern JavaScript area
Callbacks - promises - async/await - modules - error handling - timers
About the Exam

Who Should Take This?

  • Frontend developers preparing for JavaScript certification
  • Students validating web development skills
  • Backend developers moving into full-stack roles
  • Anyone practicing modern JavaScript fundamentals

Prerequisites

  • Basic HTML and CSS knowledge helpful
  • Hands-on JavaScript practice
  • Comfort reading small code snippets
  • Understanding of browser behavior

Question Format

  • Multiple choice questions
  • Code output prediction
  • DOM and event scenarios
  • Async flow and promise behavior

Exam Focus

  • Modern JavaScript syntax
  • Core web APIs
  • Asynchronous programming
  • Debugging and error handling

Exam Tips & Strategy

  • Trace Scope and Hoisting: Know how var, let, const, function declarations, and closures behave in small snippets.
  • Practice Async Flow: Promises, async/await, microtasks, timers, and error handling are common sources of tricky questions.
  • Know DOM Events: Review event targets, bubbling, preventDefault, delegation, and form handling.
  • Review Array Methods: Be comfortable with map, filter, reduce, find, some, every, sort, and mutation behavior.
  • Understand Equality: Know the difference between == and ===, truthy/falsy values, and common coercion cases.
  • Read Code Precisely: Small details like missing returns, this binding, or mutation can change the correct answer.
Next Step

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