JavaScript For Bug Bounty

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PHASE 1 – JAVASCRIPT FUNDAMENTALS

  1. Variables (var, let, const)
  2. Data Types (string, number, boolean, null, undefined, object, array, symbol)
  3. Type Conversion & Type Coercion
  4. Operators (arithmetic, comparison, logical, ternary)
  5. Conditionals (if, else, switch)
  6. Loops (for, while, do-while, for…of, for…in)
  7. Functions (declaration, expression, arrow functions)
  8. Parameters & Return values
  9. Scope (global, function, block)
  10. Hoisting
  11. Closures
  12. The “this” keyword
  13. Execution Context
  14. Call Stack
  15. Error Handling (try, catch, finally, throw)

PHASE 2 – OBJECTS & ARRAYS

  1. Objects (creation, properties, methods)
  2. Object Destructuring
  3. Spread Operator (…)
  4. Rest Parameters
  5. Arrays (creation & indexing)
  6. Array Methods (map, filter, reduce, forEach, find, some, every)
  7. JSON (JSON.parse, JSON.stringify)
  8. Prototypes
  9. Prototype Chain
  10. ES6 Classes
  11. Constructor Functions

PHASE 3 – ASYNCHRONOUS JAVASCRIPT

  1. Synchronous vs Asynchronous
  2. Callbacks
  3. Callback Hell
  4. Promises
  5. Promise Chaining
  6. async / await
  7. Event Loop
  8. Microtasks vs Macrotasks
  9. setTimeout / setInterval

PHASE 4 – DOM & BROWSER ENVIRONMENT (CRITICAL FOR BUG BOUNTY)

  1. DOM Tree Structure
  2. document object
  3. getElementById
  4. getElementsByClassName
  5. querySelector / querySelectorAll
  6. innerHTML vs textContent
  7. createElement
  8. appendChild / removeChild
  9. Event Listeners
  10. Event Bubbling & Capturing
  11. Prevent Default
  12. window object
  13. location object
  14. history object
  15. navigator object
  16. localStorage
  17. sessionStorage
  18. Cookies
  19. document.cookie
  20. fetch API
  21. XMLHttpRequest (XHR)
  22. Form handling in JS
  23. File uploads in JS

PHASE 5 – WEB SECURITY RELATED JAVASCRIPT

  1. DOM-based XSS
  2. Reflected XSS
  3. Stored XSS
  4. innerHTML injection risks
  5. eval() risks
  6. setTimeout string execution risk
  7. PostMessage API
  8. CORS
  9. CSRF basics
  10. JWT structure & decoding
  11. Token storage (localStorage vs cookies)
  12. Same Origin Policy
  13. Open Redirect via JS
  14. Client-side validation bypass
  15. Race Conditions in JS
  16. Clickjacking basics

PHASE 6 – ADVANCED & MODERN JAVASCRIPT

  1. Modules (import/export)
  2. ES6+ features
  3. Dynamic Imports
  4. Source Maps
  5. Minified Code Reading
  6. Debugging in DevTools
  7. Breakpoints
  8. Network Tab Analysis
  9. Extracting API Endpoints from JS
  10. Understanding SPA (Single Page Applications)
  11. Client-side Routing
  12. REST APIs
  13. GraphQL basics
  14. Prototype Pollution
  15. Object.assign risks
  16. Deep merge vulnerabilities

PHASE 7 – FRAMEWORK AWARENESS (Basic Understanding Only)

  1. React basics
  2. Angular basics
  3. Vue basics
  4. State management concepts
  5. Component lifecycle
  6. Virtual DOM concept

PHASE 8 – PRACTICAL SKILLS

  1. Reading large JS files
  2. Beautifying JS code
  3. Finding hidden parameters
  4. Understanding business logic in JS
  5. Identifying trust boundaries
  6. Mapping frontend to backend APIs
  7. Intercepting requests with Burp Suite
  8. Replaying API requests
  9. Modifying JSON requests

END GOAL:
Be able to read any production JavaScript file and understand:

  • What data is sent
  • Where it is sent
  • How it is validated
  • What can be manipulated

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