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7/14/2026
Build a Reconnecting SSE Task Stream With Node.js

Build a Reconnecting SSE Task Stream With Node.js

Short summary

A hands-on tutorial for building a reconnecting SSE task stream in Node.js 20+ with no dependencies. Covers event IDs as resume cursors, Last-Event-ID header for replay, consumer-side deduplication, and the critical distinction between connection recovery and state recovery. Includes a test file that simulates disconnection and verifies convergence without duplicates.

  • •Build a reconnecting SSE stream with Node.js 20+ using event IDs as resume cursors
  • •Consumer-side deduplication via Map keyed by event ID handles at-least-once delivery
  • •Key lesson: connection recovery is not state recovery; design for idempotent projection

Generated with AI, which can make mistakes.

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