ng serve: how to change inspector port?

Question

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

Possible duplicate https://stackoverflow.com/questions/37154813/angular-cli-server-how-to-specify-default-port ? — Oriol_IL, Oct 24 '19 at 07:51
@Oriol_IL no, that would change the port that the application will listen on - not the inspector port — TmTron, Oct 24 '19 at 07:57
Think inspector is backend related, not Angular therefore doesn't have anything with ng serve command — mxr7350, Oct 24 '19 at 08:01

TmTron · Accepted Answer · 2021-05-19T07:14:46.370

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

I am using nx as Fullstack single repo framework and your answer help me to set the inspector port of a Nest application because it was changing on every run "serve": { "builder": "@nrwl/node:execute", "options": { "buildTarget": "api:build", "inspect": true, "port": 9229 } } — 80sax, May 07 '20 at 17:51

score -1 · Answer 2 · answered Oct 24 '19 at 07:57

-1

ng serve --port 4202 --host 192.175.0.48 --open

answered Oct 24 '19 at 07:57

Ayush Sahu

no, that will change the application port - my question is about the inspector port – TmTron Oct 24 '19 at 08:01

2 Answers2