How to change value of process.env.PORT in node.js?

For just one run (from the unix shell prompt):

$ PORT=1234 node app.js

More permanently:

$ export PORT=1234$ node app.js

set PORT=1234

In Windows PowerShell:

$env:PORT = 1234

node.js environment-variables

$ cross-env PORT=1234

node.js environment-variables

use the below command to set the port number in node process while running node JS programme:

set PORT =3000 && node file_name.js

The set port can be accessed in the code as

process.env.PORT

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