'testing if client can see if port is listening but not sure how to find port or if my connection is possible

I have tried to run this code to create a Websocket but i think i cannot either because sue i don’t know my port number or i have not downloaded something.

const Websocket = require('ws')

const wss = new Websocket.Server({
    port:5500
})

Console.log(`Say hi to websocket on port 5500`)

Error: Cannot find module '/Users/mad/Websockets-UDEMY/index.js'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
node.jswebsocketjava-websocket


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