ɪᴛ'ꜱ ᴀ ᴛᴇʀʀɪʙʟᴇ ᴡᴏʀᴅ, ᴡɪᴛʜ ᴘʀɪᴍᴀʀɪʟʏ ɴᴇɢᴀᴛɪᴠᴇ ᴄᴏɴɴᴏᴛᴀᴛɪᴏɴꜱ. ɪ ᴄᴏɴꜱɪᴅᴇʀ ɪᴛ ᴛᴏ ʙᴇ ᴀ ʀᴇꜰʟᴇᴄᴛɪᴏɴ ᴏꜰ ᴛʜᴇ ᴍᴇɴᴛᴀʟɪᴛʏ ᴏꜰ ᴊᴀᴠᴀꜱᴄʀɪᴘᴛ ᴅᴇᴠᴇʟᴏᴘᴇʀꜱ:

● The term "injection" has several distinct meanings in computer science:

*1. Security Vulnerabilities (Code Injection)*

Malicious input that gets executed as code:

- SQL Injection: Inserting SQL commands through user input to manipulate databases

- Command Injection: Inserting shell commands through application input

- XSS (Cross-Site Scripting): Injecting JavaScript into web pages viewed by others

- LDAP/XML/Header Injection: Similar attacks targeting other interpreters

2. Dependency Injection (DI)

A design pattern where dependencies are provided to objects rather than created internally:

// Without DI - tightly coupled

class UserService {

private db = new Database(); // creates its own dependency

}

// With DI - loosely coupled

class UserService {

constructor(private db: Database) {} // dependency injected

}

This is fundamental to Angular (which this project uses), Spring, and other frameworks.

3. Script/Code Injection (Legitimate)

Intentionally inserting code into a process or page:

- Browser extension content scripts: Injecting scripts into web pages (as this project does with plebian-signer-extension.ts)

- DLL injection: Loading libraries into running processes

- Hooking/Patching: Modifying program behavior at runtime

*4. Fault Injection*

Deliberately introducing errors to test system resilience and error handling.

*5. Packet Injection*

Inserting crafted network packets into a data stream (used in network testing and attacks).