Failed to start language worker process for node

[sunxinhuan]

Ibiza portal URL: https://aka.ms/antuxstage
Runtime version: 2.0.12134.0 (~2)
Browser: Chrome
Hosting Plan: Consumption

For V2 function app, failed to start language worker process for node.

Please refer to the snapshot:

Repro steps:
1. Open a V2 function app;
2. Add the app setting to running JS scenarios in Azure: FUNCTIONS_WORKER_RUNTIME=node
3. Add a HttpTrigger template;
4. Click "Run" button and Verify the Logs.

[ammanifold]

@sunxinhuan what is the value of your app setting: WEBSITE_NODE_DEFAULT_VERSION ?

[RudyLu]

+1,
The value of WEBSITE_NODE_DEFAULT_VERSION for my setup is 6.5.0.
But if I changed it into 8.12.0, it would show a different error msg.

Updated

it turns out to be ok if I changed it to 8.11.1.
I referenced this answer to find out what node versions are available on the platform.

[stillnet]

I'm getting this error. My node version (by default, I haven't changed it), is 11.something. I don't think the solution is to change it back to 8.11.1, right? That was the solution for people who where on an older version (6.x). Any other ideas?

[rene78]

Same problem here.
Funnily after one more successful call of the function from my webapp it stopped working with "Error: Failed to start language worker process for: node. node exited with code -1". Node default version: 8.11.1

Update: 7h later everything works fine again without me doing anything. A bug like that might be acceptable for a hobby app like mine, but definitely not a customer facing software.

[tobybrad]

For the brave souls who have gone the Linux route:

ls /opt/nodejs from the console or Kudu will show you available versions. At the time of writing 10.1.0 is the highest available version and this one works for me.

[brunoogata]

Every time this error appears, I change the node version and refresh the page. This is a efemerous repair but allows me to keep working.

[oreporan]

What a stupid bug...
Changing the version and refreshing fixed for me as well

[ChrisL108]

Same thing here. Refreshing Node version did the trick.
Agree with @rene78, this would be unacceptable for a production level app.

[A142838]

Same happens for us after each deployment
Runtime version of function
Runtime version: 2.0.12382.0 (~2)
Node Version set : WEBSITE_NODE_DEFAULT_VERSION -> 8.11.1
Runtime versions on the app service plan has 8.11.1 available
Error message : error failed to start language worker process for node. the operation has timed out

[tsmorton]

I've started seeing this as well post deploy for one of my function apps. Changing any application setting appears to resolve this which is easier than messing around with the set of valid values for WEBSITE_NODE_DEFAULT_VERSION. Just restarting the function app doesn't appear to work.

[soninaren]

Several folks are having different issues from different symptoms. Please open a new issue if you can still reproduce the issue. The supported node versions are version 8.x and 10.x. As of today we have support for WEBSITE_NODE_DEFAULT_VERSION -> ~8 and ~10 as version values.