Tips on Azure Function

• This article is under ongoing development hence the content may be updated and changed regularly.

1. Error when running func host start or func start from the terminal.

Version

Core Tool: 4.0.3971 Function Runtime Verison: 4.0.1.16815

Error Content

Azure Functions Core Tools
Core Tools Version:       4.0.3971 Commit hash: d0775d487c93ebd49e9c1166d5c3c01f3c76eaaf  (64-bit)
Function Runtime Version: 4.0.1.16815

Can't determine project language from files. Please use one of [--csharp, --javascript, --typescript, --java, --python, --powershell, --custom]
Value cannot be null. (Parameter 'provider')

Also, sometime the terminal refuse to execute and wait infinitely after this log

Azure Functions Core Tools
Core Tools Version:       (VERSION CODE) Commit hash: (Hide on purpose)  (64-bit)
Function Runtime Version: (VERSION CODE)

Solution

• Go to host.json
• Remove the below lines:

"extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[2.*, 3.0.0)"
  }

2. Display all logs when running Azure locally

Solution

• Go to host.json
• Edit “logging” like below

  "logging": {
    "logLevel": {
        "default": "Debug"
    }
  }