angularnode-inspectornrwl-nx

ng serve: how to change inspector port?

When I start ng serve server on the command line it fails with:

Starting inspector on localhost:7777 failed: address already in use

This is expected, because there is really already another instance running.

So how can I change the inspector port for this instance?

I've tried to set the env-var NODE_OPTIONS to

both had no effect: i.e. it was still failing with 

Starting inspector on localhost:7777 failed: address already in use

Note: I do NOT want to change the application port: e.g. ng serve --port 5600 - it's only about the node-inspector port

Solution

  • tldr;

    Since ng serve server uses nrwl/node:execute I must use the nrwl port option:

    ng serve server --port 7888

    and not the ng serve port:

    ng serve  --port 7888 server

    Details:

    When I start ng serve server, then ng will

    in my case, this is

    "serve": {
  "builder": "@nrwl/node:execute",
  "options": {
    "buildTarget": "server:build"
  }
}

    Thus, ng will just start the @nrwl/node:execute bulder, which supports the option -port

    So to summarize, there are 2 port options available

    ng serve -port 5600 server -port 7888