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60 Days Javascript Mastery Roadmap in 2026

Category: Programming RoadmapsDate: November 27, 2025Posted by: Question Mentor
2-Month JavaScript Core Language Roadmap | Question Mentor

2-Month JavaScript Core Language Roadmap

Master JavaScript Day-by-Day: From Variables to Async & Modules

📖 Introduction to JavaScript Core Language

What is JavaScript? JavaScript is the world’s most popular programming language, powering dynamic, interactive behavior on over 98% of websites. As a high-level, just-in-time compiled, multi-paradigm language, it supports object-oriented, imperative, and functional programming styles.

Why Learn JavaScript? JavaScript is essential for front-end web development and increasingly dominant in back-end (Node.js), mobile (React Native), and even desktop apps (Electron). Mastery of the core language — variables, functions, closures, promises, and modules — forms the bedrock for any modern web developer’s career .

Who is this roadmap for? This roadmap is ideal for absolute beginners with basic computer literacy or intermediate learners seeking to solidify foundational understanding. No prior coding experience is required — only curiosity and consistency.

What will you learn? By the end of this 2-month journey, you will:

  • Understand and apply core syntax, data types, operators, conditionals, and loops
  • Write robust functions, grasp scope, and master closures and higher-order functions
  • Manipulate the DOM to create interactive web pages without frameworks
  • Handle asynchronous code using callbacks, promises, async/await
  • Organize code using ES6+ modules (import/export)
  • Apply modern best practices for clean, performant, maintainable code

Prerequisites: None — beginner friendly! A modern browser (Chrome/Firefox) and a code editor (VS Code recommended) are all you need.

📊 Your Learning Progress

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📚 Month 1: JavaScript Fundamentals & Core Mechanisms

Week 1: Syntax, Data Types, Operators & Control Flow

Day Topic & Subtopics Key Activities & Resources
Day 1
Introduction & Setup
  • What is JavaScript? History & Role in Web Dev
  • Running JS: Browser Console vs Node.js
  • Setting up VS Code & Chrome DevTools
  • Writing your first “Hello, World!”
Install VS Code, open Chrome DevTools (F12), and execute 5 console.log statements. Experiment with variables, numbers, and strings. Spend 60 minutes exploring.
MDN: What is JS? Traversy: JS Crash Course
Day 2
Variables & Data Types
  • let, const vs var (block scope)
  • Primitive types: String, Number, Boolean, null, undefined, Symbol, BigInt
  • typeof operator & type coercion basics
  • Dynamic typing explained
Declare variables of each type. Test typeof and observe coercion (e.g., “5” + 3). Write a script that swaps two variables. Practice for 45 mins.
MDN: Data Structures JavaScript.info Types
Day 3
Operators & Expressions
  • Arithmetic (+, -, *, /, %, **)
  • Comparison (==, ===, >, <, etc.)
  • Logical (&&, ||, !)
  • Assignment & Ternary operators
Build a mini calculator: prompt user for two numbers & operation, output result. Test truthy/falsy values. Focus on strict equality (===). 50 mins.
MDN: Operators freeCodeCamp: Operators
Day 4
Control Flow: Conditionals
  • if / else if / else
  • switch statements
  • Truthy/falsy deep dive
  • Short-circuit evaluation
Write a grade calculator (A-F based on %) using if/else and switch. Simulate user login (truthy username/password). Time: 50 mins.
JavaScript.info: if/else Net Ninja: Conditionals
Day 5
Control Flow: Loops
  • for loop, while, do-while
  • break & continue
  • Nested loops
  • Loop performance tips
Print multiplication table (1-10). Find first 10 prime numbers. Convert a for loop to while. Practice for 60 mins.
MDN: Loops freeCodeCamp: Loops
Day 6
Functions: Basics & Declarations
  • Function declaration vs expression
  • Parameters & arguments
  • Return values & side effects
  • Default parameters (ES6)
Create functions: area of circle, max of 3 numbers, greet user (with default name). Call functions 10+ ways. 55 mins.
MDN: Functions Traversy: Functions
Day 7
Week 1 Review & Project
  • Recap all concepts
  • Debugging with console.log & breakpoints
  • Mini Project: BMI Calculator
  • Code formatting with Prettier
Build a BMI calculator: input weight/height, compute BMI, classify (underweight/normal/overweight). Add validation. Share on GitHub. 90 mins.
BMI Calculator GitHub learn-js.org Interactive

Week 2: Arrays, Objects & Functional Basics

Day Topic & Subtopics Key Activities & Resources
Day 8
Arrays: Creation & Basic Methods
  • Literal syntax & Array constructor
  • Indexing, length, push/pop, shift/unshift
  • slice vs splice
  • join, includes, indexOf
Create shopping list array. Add/remove items. Extract sublists. Check if item exists. Reverse & join into string. 50 mins.
MDN: Array JavaScript.info: Arrays
Day 9
Iterative Array Methods
  • forEach
  • map
  • filter
  • reduce (intro)
Transform arrays: double numbers (map), extract odds (filter), sum (reduce), log each (forEach). Avoid for loops! 55 mins.
freeCodeCamp: Array Methods Net Ninja: Array Methods
Day 10
Objects: Literals & Properties
  • Object literal syntax
  • Dot vs bracket notation
  • Adding/modifying/deleting properties
  • Object.keys/values/entries
Model a user profile (name, age, hobbies). Dynamically add properties. Iterate over keys/values. Clone object via spread. 50 mins.
MDN: Working with Objects JavaScript.info: Objects
Day 11
Object Methods & this Keyword
  • Methods inside objects
  • this binding in methods
  • Arrow functions vs regular functions for methods
  • Factory functions
Create a calculator object with add/sub/mult/div methods. Build a pet object with speak() method. Experiment with this. 60 mins.
MDN: Object Methods Traversy: this Keyword
Day 12
Nested Objects & Arrays
  • Object/array composition
  • Accessing deeply nested data
  • Optional chaining (?.)
  • JSON.stringify & JSON.parse
Model a library system (books array, each book has author object). Safely access nested props. Convert to/from JSON. 55 mins.
MDN: Optional Chaining freeCodeCamp: JSON
Day 13
Scope & Hoisting
  • Global, Function, Block scope
  • var hoisting vs let/const TDZ
  • Lexical scoping
  • Scope chain visualization
Predict outputs of 10+ hoisting/scope snippets. Identify shadowing. Use DevTools to inspect scope. Write TDZ-safe code. 60 mins.
MDN: Hoisting freeCodeCamp: Scope & Closures
Day 14
Week 2 Review & Project
  • Recap arrays, objects, scope
  • Project: To-Do List (CLI)
  • Add, delete, mark complete tasks
  • Persist in localStorage
Build a console-based to-do list using arrays/objects. Store tasks in localStorage. Implement add/delete/mark. Share on GitHub. 120 mins.
To-Do GitHub MDN: localStorage

Week 3: Functions Deep Dive, Closures & DOM Intro

Day Topic & Subtopics Key Activities & Resources
Day 15
Function Expressions & Arrow Functions
  • Anonymous functions
  • Arrow syntax (=>) and concise body
  • this binding differences
  • When to use arrows vs regular
Refactor week 2 methods to arrow functions. Compare this in callbacks. Write 5 arrow utility functions. 50 mins.
MDN: Arrow Functions freeCodeCamp: Arrow Functions
Day 16
Closures
  • What is a closure?
  • Lexical environment retention
  • Practical use cases: private variables, callbacks
  • Memory considerations
Build a counter with private state. Create a config factory. Debug memory leaks. Visualize scope chains. 60 mins .
MDN: Closures Fun Fun Function: Closures
Day 17
Higher-Order Functions
  • Functions as arguments
  • Functions as return values
  • Function composition
  • Currying (intro)
Implement custom map/filter. Create a logger HOF. Compose validation functions. Explore Ramda.js currying. 65 mins.
JavaScript.info: Advanced freeCodeCamp: HOFs
Day 18
Introduction to DOM
  • What is the DOM?
  • document object & tree structure
  • getElementById, querySelector
  • textContent vs innerHTML
Create HTML page with headings/paragraphs. Select elements, change text/content. Build a dynamic quote generator. 55 mins .
MDN: DOM Intro Traversy: DOM Crash
Day 19
DOM Manipulation: Attributes & Styles
  • getAttribute/setAttribute
  • classList (add/remove/toggle)
  • style property vs CSS classes
  • Inline styles best practices
Create theme switcher (light/dark). Toggle CSS classes on click. Dynamically set image alt/title. Avoid style.cssText. 50 mins.
MDN: setAttribute MDN: classList
Day 20
DOM Events: Basics
  • addEventListener syntax
  • Common events: click, input, submit, keydown
  • Event object (target, type, preventDefault)
  • Event delegation intro
Build button counter, color palette picker, form validator. Practice preventDefault on form submit. 60 mins .
MDN: Events What the heck is the event loop?
Day 21
Week 3 Review & Project
  • Recap closures, HOFs, DOM
  • Project: Interactive Quiz App
  • Multiple choice, scoring, feedback
  • Use DOM for dynamic updates
Build a 5-question quiz. Show score, correct answers. Use closures for question state. Style with CSS. Deploy on GitHub Pages. 150 mins.
Quiz App GitHub GitHub Pages

Week 4: Modern JS, Async Basics & Project Week

Day Topic & Subtopics Key Activities & Resources
Day 22
ES6+ Destructuring
  • Array destructuring
  • Object destructuring
  • Default values & rest syntax
  • Nested destructuring
Destructure user objects, config arrays. Use in function parameters. Swap variables without temp. 45 mins .
MDN: Destructuring Web Dev Simplified
Day 23
Template Literals & Spread/Rest
  • String interpolation
  • Multi-line strings
  • Spread (…) in arrays/objects
  • Rest parameters (…args)
Generate HTML templates dynamically. Merge objects with spread. Create sum(…nums). Avoid concat/apply. 50 mins .
MDN: Template Literals MDN: Spread
Day 24
Callbacks & Callback Hell
  • What is a callback?
  • Asynchronous example: setTimeout
  • Callback hell pyramid
  • Refactoring with named functions
Simulate async tasks (file read, API mock). Create nested callbacks. Refactor to flatten. Visualize call stack. 55 mins.
MDN: Callbacks Traversy: Callbacks
Day 25
Promises
  • Promise states: pending/fulfilled/rejected
  • .then() & .catch()
  • Promise.all / Promise.race
  • Creating promises with new Promise()
Wrap setTimeout in promise. Chain API requests. Handle errors with catch. Race multiple promises. 60 mins .
MDN: Promises JavaScript.info: Promises
Day 26
Async/Await
  • async function declaration
  • await expressions
  • Error handling with try/catch
  • Top-level await (in modules)
Convert promise chains to async/await. Fetch mock data. Handle errors gracefully. Compare performance visually. 65 mins .
MDN: async/await Web Dev Simplified: Async/Await
Day 27
Error Handling: try/catch/finally
  • Throwing custom errors
  • Catching synchronous & async errors
  • finally block use cases
  • Global error handlers (window.onerror)
Validate user input with custom errors. Safely parse JSON. Log errors to console. Implement global handler. 50 mins .
MDN: Error Handling freeCodeCamp: Error Handling
Day 28
Month 1 Capstone Project
  • Weather App (Mock API)
  • Fetch data, display conditions
  • Search by city, store history
  • Responsive UI with CSS
Build full weather app using mock JSON. Implement search, caching, error states. Deploy on GitHub Pages. Record demo video. 240 mins .
OpenWeather API (free tier) JS Projects Repo

📚 Month 2: Advanced Core, Modules & Professional Practices

Week 5: Modules, Tooling & Testing Basics

Day Topic & Subtopics Key Activities & Resources
Day 29
ES6 Modules: import/export
  • export default vs named exports
  • import syntax variations
  • Module scope & top-level await
  • Browser support (type=”module”)
Split quiz app into modules (questions, ui, logic). Use default and named exports. Test in browser with type=”module”. 60 mins .
MDN: Modules Web Dev Simplified: Modules
Day 30
npm & Package Management
  • What is npm?
  • package.json & dependencies
  • Installing packages (lodash, date-fns)
  • package-lock.json explained
Initialize npm project. Install 2 utility libs. Use in script. Explore node_modules. Commit package*.json. 45 mins.
npm docs Traversy: npm Crash
Day 31
Bundlers: Vite Introduction
  • Why bundlers? (vs browser modules)
  • Vite vs Webpack (speed focus)
  • Creating project with npm create vite
  • Hot Module Replacement (HMR)
Scaffold Vite project. Convert weather app to Vite. Experience HMR. Explore vite.config.js basics. 70 mins.
Vite Guide Vite Crash Course
Day 32
Testing: Jest Basics
  • Why test? (TDD intro)
  • describe, it, expect
  • Test-driven development cycle
  • Mocking async functions
Write tests for calculator functions. Achieve 80% coverage. Refactor code using tests. Run in watch mode. 60 mins.
Jest Docs Jest for Beginners
Day 33
Linting & Formatting
  • ESLint setup & rules
  • Prettier integration
  • VS Code plugins
  • .eslintrc & .prettierrc
Configure ESLint/Prettier in Vite project. Fix lint errors. Set up auto-format on save. Enforce consistent style. 45 mins .
ESLint Guide Prettier Docs
Day 34
Debugging Mastery
  • Chrome DevTools: Sources panel
  • Breakpoints, call stack, scope
  • console.table/group/time
  • Performance profiling intro
Debug quiz app bugs. Profile load time. Optimize slow loops. Use memory snapshots. Master conditional breakpoints. 75 mins.
Chrome DevTools Docs DevTools Crash Course
Day 35
Week 5 Review & Project
  • Refactor weather app with modules
  • Add tests & linting
  • Optimize bundle size
  • Document with JSDoc
Modernize weather app: modularize, test, lint, document. Achieve 90% test coverage. Add GitHub Actions CI. 180 mins.
JSDoc GitHub Actions

Week 6: Advanced Patterns & Performance

Day Topic & Subtopics Key Activities & Resources
Day 36
Prototypes & OOP
  • Prototype chain explained
  • Object.create()
  • Classes (syntactic sugar)
  • Static methods & inheritance
Build Animal -> Dog hierarchy. Compare class vs prototype syntax. Inspect __proto__ in console. Avoid anti-patterns. 60 mins.
MDN: Prototypes Traversy: JS OOP
Day 37
Iterators & Generators
  • Iterable protocol
  • for…of loop
  • function* & yield
  • Lazy evaluation use cases
Create custom iterable (range). Build infinite sequence generator. Simulate async streams. Compare memory usage. 65 mins.
MDN: Iterators JavaScript.info: Generators
Day 38
Proxies & Reflect
  • Traps: get, set, has, etc.
  • Validation & logging use cases
  • Reflect API symmetry
  • Performance considerations
Create validator proxy (e.g., positive numbers only). Log all property accesses. Compare with getters/setters. 50 mins.
MDN: Proxy MDN: Reflect
Day 39
Memory Management
  • Call stack & heap
  • Garbage collection (mark-and-sweep)
  • Memory leaks: closures, timers, DOM
  • Chrome Memory tab
Simulate memory leak (forgotten interval). Fix with weak references. Profile heap snapshots. Analyze retainers. 60 mins .
MDN: Memory Mgmt Memory Leaks Explained
Day 40
Performance Optimization
  • Debouncing & throttling
  • Virtual DOM concept (without libs)
  • Web Workers intro
  • Lazy loading strategies
Optimize search input (debounce). Offload computation to Web Worker. Measure FPS with requestAnimationFrame. 75 mins .
freeCodeCamp: Debounce MDN: Web Workers
Day 41
Functional Programming Principles
  • Pure functions & immutability
  • map/filter/reduce deep dive
  • Function composition & pipe
  • Libraries: Ramda (light intro)
Refactor weather logic to pure functions. Implement compose/pipe. Avoid mutations with spread. 60 mins .
Mostly Adequate Guide Ramda.js
Day 42
Week 6 Review & Project
  • Build a Data Dashboard
  • Fetch/mock large dataset
  • Virtual scrolling implementation
  • Debounced search & filters
Create dashboard with 10k+ rows. Implement virtual scroll, search, sort. Optimize rendering & memory. Deploy & benchmark. 240 mins.
Simple Virtual List Virtual Scrolling Explained

Week 7: Browser APIs & Real-World Patterns

Day Topic & Subtopics Key Activities & Resources
Day 43
Fetch API & HTTP
  • fetch() vs XMLHttpRequest
  • Headers, method, body
  • Handling JSON & errors
  • AbortController for cancellation
Fetch real API (JSONPlaceholder). Handle loading/error states. Cancel pending requests. Add retries. 55 mins.
MDN: Fetch API freeCodeCamp: Fetch
Day 44
Web Storage: localStorage & sessionStorage
  • API differences
  • Storage limits & security
  • Storing objects (JSON)
  • storage event
Persist user preferences. Sync tabs with storage event. Build offline-capable note app. Handle quota errors. 50 mins .
MDN: Web Storage Local Storage Tutorial
Day 45
IndexedDB (Light Intro)
  • When to use vs localStorage
  • Basic CRUD operations
  • Libraries: idb (simplifier)
  • Offline-first architecture
Store quiz results in IndexedDB. Compare performance with localStorage. Use idb library for simplicity. 65 mins.
MDN: IndexedDB idb library
Day 46
Geolocation & Device APIs
  • navigator.geolocation
  • Permissions API
  • Device orientation/motion
  • Battery status (deprecated but useful)
Build location-aware weather app. Handle permission denials. Create tilt-controlled game. 60 mins.
MDN: Geolocation Geolocation Tutorial
Day 47
Canvas API Basics
  • 2D context
  • Shapes, paths, text
  • Animation with requestAnimationFrame
  • Pixel manipulation
Draw interactive shapes. Animate bouncing ball. Create simple data visualization. Avoid setInterval for animation. 75 mins.
MDN: Canvas Tutorial Canvas Crash Course
Day 48
Web Components Intro
  • Custom elements API
  • Shadow DOM encapsulation
  • Templates & slots
  • Framework interoperability
Create component. Style in shadow DOM. Use slots for content projection. Reuse in weather app. 70 mins.
MDN: Web Components Web Components Tutorial
Day 49
Week 7 Review & Project
  • Offline-First Note App
  • IndexedDB storage
  • Sync when online (mock)
  • Custom Web Components UI
Build note app that works offline. Save to IndexedDB. Sync on reconnect. Use custom elements for UI. Test thoroughly. 240 mins.
Service Worker Samples Offline Cookbook

Week 8: Best Practices, Capstone & Next Steps

Day Topic & Subtopics Key Activities & Resources
Day 50
Code Quality & Clean JS
  • Naming conventions
  • Function length & parameters
  • Commenting vs self-documenting code
  • SOLID principles (JS adaptation)
Refactor legacy code snippet. Apply clean code rules. Document decisions. Conduct peer review simulation. 60 mins .
Clean Code JS Event Loop Deep Dive
Day 51
Security Fundamentals
  • XSS prevention (DOMPurify)
  • CORS explained
  • Content Security Policy (CSP)
  • Secure coding checklist
Sanitize user inputs. Configure CSP header. Test XSS vulnerabilities. Review OWASP JS Top 10. 55 mins .
OWASP DOM XSS JS Security Best Practices
Day 52
TypeScript Intro (Optional but Recommended)
  • Why TypeScript?
  • Basic types & interfaces
  • Type inference & annotations
  • Migrating JS project
Convert weather app to TS. Add types to functions. Fix compile errors. Experience dev-time safety. 70 mins.
TS in 5 mins TS Crash Course
Day 53
Build Tools Deep Dive
  • Vite plugins
  • Environment variables (.env)
  • Code splitting & lazy loading
  • Production build optimization
Optimize Vite build. Analyze bundle with rollup-plugin-visualizer. Implement route-based code splitting. 65 mins.
Vite Features Vite Deep Dive
Day 54
Community & Open Source
  • Contributing to GitHub projects
  • Writing good issues/PRs
  • npm package publishing
  • Building your portfolio
Fix a “good first issue”. Write clear PR description. Publish a tiny utility package. Update GitHub profile. 60 mins.
Awesome for Beginners Open Source Guide
Day 55
Interview Prep: Core JS Questions
  • Closures, hoisting, event loop
  • this binding rules
  • Promise vs async/await
  • Common pitfalls & gotchas
Solve 20+ core JS interview questions. Explain concepts aloud. Record mock interview. Review mistakes. 90 mins.
JS Questions GitHub Namaste JavaScript
Day 56
Capstone Project Kickoff
  • Project ideation & scoping
  • Wireframing & architecture
  • Tech stack decision
  • Milestone planning
Choose project: E-commerce cart, Kanban board, or Chat app. Define MVP. Sketch UI. Plan modules. Write README draft. 120 mins.
OSSU Computer Science Figma (Wireframing)
Day 57
Capstone: Core Implementation
  • Setup project
  • Implement core logic
  • Write unit tests
  • Basic UI integration
Build foundational components. Achieve 70% test coverage. Integrate with basic HTML/CSS. Commit frequently. 240 mins.
Create React App (Optional) Vue 3 Guide (Optional)
Day 58
Capstone: Advanced Features
  • Async data handling
  • State management (vanilla)
  • Responsive design
  • Accessibility (a11y)
Add loading states, error handling. Implement undo/redo. Ensure WCAG compliance. Test on mobile. 240 mins.
MDN: Accessibility a11y Crash Course
Day 59
Capstone: Polish & Deploy
  • Performance optimization
  • Documentation (README)
  • Deploy to Vercel/Netlify
  • Write case study/blog post
Optimize bundle, Lighthouse score >90. Write detailed README. Deploy live URL. Record demo video. 240 mins.
Vercel Netlify
Day 60
Graduation & Next Steps
  • Review entire roadmap
  • Celebrate achievements!
  • Learning path forward
  • Join communities
Reflect on progress. Share capstone on social media. Join Discord/Reddit communities. Plan next topic (React, Node, etc.). 60 mins.
JavaScript Discord r/javascript

📚 Additional Learning Resources

MDN Web Docs: JavaScript Guide
Free
The definitive reference for JavaScript core language. Comprehensive, accurate, and constantly updated by Mozilla. Perfect for deep dives and clarification .
Visit Resource
JavaScript.info Modern Tutorial
Free
One of the most thorough, modern JavaScript tutorials available. Covers everything from basics to advanced topics with clear explanations and tasks .
Visit Resource
freeCodeCamp: JavaScript Algorithms
Free
Interactive coding challenges covering core JS and algorithms. Earn a certificate upon completion. Highly practical and hands-on .
Visit Resource
The Net Ninja: Modern JavaScript
Free
Shaun Pelling’s YouTube series is beginner-friendly yet deep. Covers ES6+ features, async, modules, and more with clear, concise videos .
Visit Resource
Eloquent JavaScript (3rd Ed)
Free
A classic, in-depth book now freely available online. Blends theory with practical projects. Ideal for developers who prefer reading .
Visit Resource
JavaScript 30 by Wes Bos
Free
30 hands-on projects in vanilla JavaScript. No frameworks, just core language mastery. Builds real-world skills fast .
Visit Resource
Traversy Media: JavaScript Crash Course
Free
Brad Traversy’s fast-paced, project-based YouTube tutorial. Great for visual learners and quick starts. Updated regularly .
Visit Resource
You Don’t Know JS (Book Series)
Free
Deep dive into JavaScript’s tricky parts: scope, closures, this, async, and more. For developers ready to level up their understanding .
Visit Resource
TypeScript Handbook
Free
Official guide to Microsoft’s typed superset of JS. Essential for modern development. Start here after mastering core JS .
Visit Resource
Question Mentor Community
Free
Join our supportive community of learners and mentors. Get feedback on projects, ask questions, and stay motivated on your journey.
Visit Resource
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