Tutorial: Build a Node.js Vendor-Risk Gate Using Domain Intelligence APIs

A new developer tutorial on DEV Community walks through building an explainable vendor-risk screening tool in Node.js that evaluates domains as they sign up. The system calls a domain-intelligence API to gather signals across RDAP registration data, DNS configuration, TLS certificates, HTTPS reachability, and HTTP security headers. Based on normalized evidence, the application returns one of three decisions — allow, review, or block — using configurable score thresholds and severity-based finding codes. The tutorial emphasizes building an adapter layer to isolate the external API response from application logic, improving maintainability and auditability. It also clearly outlines the tool's limitations, noting it cannot verify business legitimacy, detect malware, or predict future domain behavior.