Unknown Node.js 18 function app

Question

Unknown Node.js 18 function app

Emil Kjær Eriksen 1

Hi,

I keep getting an email "Support for Node.js 18 ends on 30 April 2025—upgrade your apps to Node.js 20" even though I don't have any function apps < Node 20 as far as I can tell but it says

You’re receiving this notification because you are associated with one or more Azure subscriptions that use Node.js 18 app(s) on Azure Functions.

Anonymous

2025-04-23T10:55:55.4133333+00:00
@Emil Kjær Eriksen ,

Could you please run the following command in the Azure CLI to check which function apps are still using Node.js 18?

az functionapp list --query "[?siteConfig.linuxFxVersion && contains(siteConfig.linuxFxVersion, '18')].[name, resourceGroup]" -o table

If your function apps are not using Linux, you can modify the query to check for the WEBSITE_NODE_DEFAULT_VERSION setting instead:

az functionapp list --query "[?siteConfig.appSettings[?name=='WEBSITE_NODE_DEFAULT_VERSION' && contains(value, '18')]].[name, resourceGroup]" -o table

Please let us know the output.
Emil Kjær Eriksen 1 Reputation point

2025-04-23T11:06:20.02+00:00

Hi @Anonymous

Thanks for your reply! The output in both cases is empty

1 answer

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Anonymous

2025-04-23T10:55:55.4133333+00:00

@Emil Kjær Eriksen ,

Could you please run the following command in the Azure CLI to check which function apps are still using Node.js 18?

az functionapp list --query "[?siteConfig.linuxFxVersion && contains(siteConfig.linuxFxVersion, '18')].[name, resourceGroup]" -o table

If your function apps are not using Linux, you can modify the query to check for the WEBSITE_NODE_DEFAULT_VERSION setting instead:

az functionapp list --query "[?siteConfig.appSettings[?name=='WEBSITE_NODE_DEFAULT_VERSION' && contains(value, '18')]].[name, resourceGroup]" -o table

Please let us know the output.
Emil Kjær Eriksen 1 Reputation point

2025-04-23T11:06:20.02+00:00

Hi @Anonymous

Thanks for your reply! The output in both cases is empty

Answer 1

Hi Emil Kjær Eriksen

Thanks for using the Q&A platform.

This is a common scenario when Azure notifies you about deprecations like Node.js 18 usage, even if you don’t recall creating or can’t locate any Function App using it.

Using retired language versions in Azure Functions may expose your apps to security vulnerabilities, performance degradation, and potential service interruptions. Although the Azure Functions team provides advanced notices through the portal, email alerts, and in-app warnings, pinpointing which Function Apps are impacted.

Kindly follow the steps provided here to check if you have any function apps < Node 20: https://techcommunity.microsoft.com/blog/appsonazureblog/keep-your-azure-functions-up-to-date-identify-apps-running-on-retired-versions/4398187

If for any reason you don't find any app, consider this notification as an awareness for all Microsoft clients.

If the response was helpful, please feel free to mark it as “Accepted Answer” and consider giving it an upvote. This helps others in the community as well.

Regards,

Obinna

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Unknown Node.js 18 function app

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