Add comprehensive documentation and inline comments

[Copilot]

Created complete documentation for the vulnerable-node security testing application, including inline code comments for all source files and README files for all directories.

Inline Code Documentation

Added JSDoc-style comments to 9 JavaScript files marking intentional vulnerabilities:

/**
 * VULNERABILITY: SQL Injection (OWASP A1)
 * Direct string concatenation creates SQL injection vulnerability
 * Example attack: username = "admin' --" bypasses password check
 */
function do_auth(username, password) {
    var q = "SELECT * FROM users WHERE name = '" + username + 
            "' AND password ='" + password + "';";
    return db.one(q);
}

Files documented:

• Core: app.js, config.js, dummy.js
• Routes: login.js, products.js, login_check.js
• Models: auth.js, products.js, init_db.js

Documentation Files

Root Level (4 files, 1,790 lines)

• README.md - Enhanced with frontmatter, TOC, installation guide, OWASP Top 10 coverage table, vulnerability summary
• SECURITY.md - Detailed vulnerability catalog with CVSS scores, exploitation examples, remediation guidance for 12 vulnerabilities
• ARCHITECTURE.md - System architecture with 15+ Mermaid diagrams (data flow, authentication, deployment, ER diagrams)
• CONTRIBUTING.md - Development setup, contribution workflow, code standards, PR process

Directory READMEs (5 files, 1,352 lines)

• routes/README.md - Endpoint reference, vulnerability details per route, attack examples
• model/README.md - Database schema with ER diagrams, SQL injection analysis by function
• attacks/README.md - Attack script documentation, exploitation guidelines
• public/README.md - Static assets documentation
• services/README.md - PostgreSQL configuration, connection strings, troubleshooting

Documentation Standards Applied

All markdown files follow consistent standards:

• Frontmatter (author, description, last_changed)
• Single H1, sequential heading hierarchy
• TOC for documents with 3+ sections
• Mermaid diagrams for visualizations
• GitHub alert helpers ([!CAUTION], [!WARNING], [!NOTE])
• Language-specified code blocks

Statistics

• 3,142 lines of markdown documentation
• 487 lines of inline comments added
• 18 files modified
• 100% code and directory coverage

Original prompt

Create new documentation for this project

Custom agent used: Documentation Specialist
Agent specialized in creating, reviewing, and maintaining high-quality documentation. The agent ensures all documentation follows established standards and best practices for clarity, consistency, and maintainability

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.