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What is the 12-factor app methodology as applied to Node.js services?

Q: What is the 12-factor app methodology as applied to Node.js services?

**TL;DR.** **12-factor** is a set of principles for portable, scalable cloud apps. The high-impact ones for Node: **config in the environment**, **explicit dependencies**, **stateless processes**, **logs as event streams**, **dev/prod parity**, and **disposability** (fast start, graceful shutdown). They let you scale horizontally and deploy reliably. stateless process scale by replicas config in env <text class='d-sub' x='375' y='38' text-anchor='middle'

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Cloud-native principles for portable, scalable services.

nodejsarchitecture12-factorcloud-native

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Stateless + env config + stdout logs

const port = process.env.PORT ?? 3000;     // config from env
// state lives in Redis, not in memory → any replica serves any request
const session = new RedisStore({ client: redis });

logger.info({ msg: 'up', port });          // logs to stdout, platform aggregates
process.on('SIGTERM', gracefulShutdown);    // disposability

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