NestJS / update detail

v12.2.0

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NestJS·Oct 19, 2026, 10:50 AMDeprecationMay break your integrationAI-assisted summary

Summary

Introduced many new configurable limits and default changes (e.g., maxPendingDataLength, maxConcurrentMessages, ValidationPipe target default, field nesting limits, reconnectOnConnackError enabled).
Enhanced microservices: pattern key length cap, Kafka header limits, gRPC stream pausing, and added deprecation warning for @EventPattern handlers replying to ClientProxy.send().
Fixed numerous bugs across Fastify, Express, and microservices, improving error handling, middleware ordering, and resource cleanup.

featurebreakingdeprecationbugfixsource healthy

Official source Last checked Oct 19, 2026, 2:00 PM

Wait — 12.1.1 is the safer choice for now.

Published 9 h ago; most regressions surface within 72 h.

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AI-assisted summarysource healthyLast checked Oct 19, 2026, 2:00 PM

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