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Software Security
  • README
  • Prerequisites
    • Prerequisites
  • Introduction
    • Cyber security principles
    • Basic web concepts
      • HTTP
      • JavaScript
      • Cookies
      • SQL
      • DOM
      • APIs and the multitier architecture
    • Basic browser security concepts
      • Same-Origin Policy (SOP)
      • Cross-Origin Resource Sharing (CORS)
      • Cookies
      • Tracking
    • Basic security concepts
      • Hashing
  • Access Control: Basics
    • Authentication
      • Passwords
      • Password managers
      • Attacking passwords - online
      • Attacking passwords - offline
    • Authorization
      • Insecure direct object references
    • Session Management
    • CSRF
      • CSRF: why & how it works
      • Protecting against CSRF attacks
    • SSRF
      • SSRF: how it works and how we can protect against it
  • Access Control: Advanced
    • Authentication
      • Federation
      • Alternative authentication mechanisms
      • FIDO2 and WebAuthn
  • Injection attacks
    • Injection attacks
    • SQL Injection
    • Command Injection
    • Cross-site scripting
      • Input validation
      • Context sensitive output encoding
      • About the HttpOnly flag
      • Content Security Policy
    • Subresource integrity
    • Sandboxing
  • HTTPS
    • HTTPS
    • Introduction to cryptography
    • PKI
    • Setting up HTTPS
    • References
  • HTTP Headers for security
    • HTTP Headers
  • Threat Modeling
    • Threat modeling introduction
    • Threat modeling basics
    • Inspiration for threats
  • Bringing it all together
    • A comprehensive overview of controls
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  1. Introduction
  2. Basic web concepts

JavaScript

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Last updated 3 years ago

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JavaScript

JavaScript (JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat.

JavaScript runs on the client side of the web, which can be used to design / program how the web pages behave on the occurrence of an event. JavaScript is an easy to learn and also powerful scripting language, widely used for controlling web page behavior.

Do not confuse JavaScript with the Java programming language. Both "Java" and "JavaScript" are trademarks or registered trademarks of Oracle in the U.S. and other countries. However, the two programming languages have very different syntax, semantics, and uses.

Source attribution

Some parts of this page are based on and by Mozilla Contributors, which is licensed under .

JavaScript
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