Use variables in WebSocket requests

You can use Postman variables in the URL of a WebSocket connection or the body of a message. For example, you can create a variable named my_host, set the value to example.com, and then use ws://{{my_host}}/api/example as a URL. If you enter {{ in either the URL box or message editor, you can autocomplete your variables.

See Store and reuse values using variables for more information.