Node-red running port to variable

General
1

Hello! How can I retrieve the port that node-red is running on (ex. 1880) and use it as any form of variable inside the editor? I am eventually looking to have several instances running with same settings and userDir (node-red -p 1881 and so on..), I have a python script that is called within node-red that returns data back to node-red via the HTTP (post) node, I need to feed this python script the correct port so it knows which instance to report back to. Thanks!

2

If you set an env var and use that in the node-red start up, it will be accessible in a function as env.get('xxx') or an inject using the environment variable selection and in JSONata as $env('xxx')

NOTE: I am faily certain if you set PORT=1889 in the env starting node-red (without the -p param) node-red will use PORT and you can access env.get('PORT') in a function (or as described above)

2 Likes
3

Your solution in your NOTE section works perfectly, and I am able to retrieve the port with env var inside the editor, I am running node-red under windows currently:

set PORT=1881
node-red
11 Mar 13:42:03 - [info] Server now running at http://127.0.0.1:1881

Thank you Steve-Mcl.

2 Likes
4

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.