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host.json Reference¶

Host-level runtime settings for .NET isolated worker function apps.

flowchart TD
    A[Configuration] --> B[Build]
    B --> C[Deploy]
    C --> D[Observe]

Topic/Command Groups¶

Baseline host.json¶

{
  "version": "2.0",
  "functionTimeout": "00:10:00",
  "logging": {
    "applicationInsights": {
      "samplingSettings": {
        "isEnabled": true,
        "maxTelemetryItemsPerSecond": 20
      }
    }
  },
  "extensions": {
    "http": {
      "routePrefix": "api"
    },
    "queues": {
      "batchSize": 16,
      "maxDequeueCount": 5
    }
  }
}

Key settings¶

functionTimeout: execution limit per invocation
extensions.http.routePrefix: HTTP route prefix
extensions.queues.maxDequeueCount: poison handling threshold

Review Matrix¶

Review area	Page-specific check
Scope	Confirm the guidance applies to host.json Reference.
Source basis	Validate the recommendation against the Microsoft Learn sources in this page.
Evidence	Capture command output, portal state, metrics, logs, or screenshots before treating the result as proven.

See Also¶

Sources¶