Implementing Node.js Feature Flags — Backend API Rollout Evidence for SaaS

A Node.js feature flags backend API becomes dangerous when its current value is the only fact left after an incident. For a developer-tools SaaS, rollback safety depends on retaining the decision that exposed each account, the configuration that produced it, and the outcome that followed. TL;DR: manage simple flags in the backend, use deterministic account assignment for percentage exposure, and poll for configuration changes. Before enabling the first account, write an append-only release-evidence record outside the flag store. Infrai can suit a small control plane that benefits from a broad