eslint-plugin-jsx-a11y vs PortScan.com

eslint-plugin-jsx-a11y is a free MIT-licensed package that uses ESLint to statically inspect JSX for accessibility issues in React applications. Its rules cover alternative text, ARIA properties, values, roles and requirements, labels, keyboard access, and captions for audio and video. It can flag clickable non-interactive elements without keyboard listeners and interactive handlers on elements that are not focusable. Recommended and strict configurations are documented for legacy .eslintrc files and flat eslint.config.js files. Configuration can map custom component names to DOM element types and DOM attributes to JSX properties, allowing those abstractions to be checked. An optional polymorphicPropName setting is supported, although the project warns that polymorphic components can be harder to maintain. Installation instructions cover npm and Yarn and require ESLint. The plugin analyzes static code rather than rendered DOM. Its maintainers recommend pairing it with @axe-core/react and assistive-technology testing. It has no manual review tools, mobile testing, browser extension, or remediation guidance. The repository links to Tidelift for professional support.

PortScan.com is a free cloud service that checks TCP ports on the public IP address making the request and reports whether each is open, closed or filtered. Fast scan checks 32 common ports in about 20 seconds. Deep scan checks all 65,535 TCP ports and includes service version detection. The target comes from the visitor’s connection, so another IP address cannot be entered. An API offers polling endpoints and a streaming v2 endpoint, requires no signup or API key, and supports IPv4 and IPv6. Webhook callbacks can report scan completion or failure for CI/CD pipelines and monitoring scripts. An MCP server provides fast_scan and deep_scan tools with setup instructions for several coding and chat tools. The API supports JSON exports, TCP scans only, and results expire after 24 hours. PortScan.com lists scanning nodes in the Netherlands, France and the UK, with results stored in an EU database. It says metadata is logged for 180 days and that the scan is a basic port check, not a security audit; results may be incomplete or inaccurate.