Node.js feature flag implementation requires careful safety design for edtech rollouts

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A DEV Community article outlines safe practices for implementing feature flags in Node.js applications, particularly for edtech rollouts. The core recommendation is to avoid network calls in the critical delivery path by using cached local values and background polling. Default flag values should be set to the safest state, typically false, to enable automatic rollback if the flag service fails. For a system requiring 60-second rollback capability, the article suggests a 15-second polling interval and a 45-second maximum cache age. The design prioritizes rollback safety over feature richness when choosing between different flag management solutions.

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