skills/ HoangNguyen0403/agent-skills-standard

nestjs-notification

Build dual-write notification services with database persistence and FCM push delivery in NestJS. Use when creating notification entities, sending push via FCM, or implementing in-app notification feeds.

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NestJS Notification Architecture

Priority: P0 (CRITICAL)

Implement "Dual-Write" notification system: persist to Database (In-App) and send via FCM (Push).

Workflow: Send Notification

  1. Save to database — Persist notification entity with type enum and metadata.
  2. Check FCM token — Verify recipient valid fcmToken; skip push if missing.
  3. Send push — Call FCM inside try/catch; never let FCM failure block request.
  4. Serialize data — Convert Dates to ISO strings; keep FCM data payload flat (IDs only).

Dual-Write Service Example

See implementation examples

Structure

See implementation examples

Implementation Guidelines

  • Use Dual-Write: Save to DB first, then attempt FCM. Catch FCM errors so they don't block logic.
  • Define Granular Types: Use NotificationType Enum (e.g., APPOINTMENT_REMINDER) for frontend icon/color logic.
  • Stringify Metadata: Store routing data (IDs) as JSON string in DB, but Map to string-only Key-Values for FCM data.
  • Handle Tokens: Check for fcmToken existence before sending. Fail gracefully if missing.
  • Serialize Dates: Convert Dates to ISO strings before sending to FCM.

Anti-Patterns

  • No Generic Types: Avoid type: string. Always use Enum.
  • No Blocking FCM: Never await FCM without try/catch. It shouldn't crash request.
  • No Complex Data in Push: Keep FCM data payload flat and minimal (IDs only). Fetch details on open.

References

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