Firebase serve error: Port 5000 is not open. Could not start functions emulator

For Mac/Linux, use the Terminal/Shell to find the Process ID (PID), then kill the process.

sudo lsof -i :5000
sudo kill -9 PID

In MacOS Monterey, port 5000 may be claimed by a new "AirPlay Receiver". This can be disabled in Settings -> Sharing:

Disabling the AirPlay Receiver (if you do not need it) frees up port 5000.

Update 2024: In MacOS Sonoma, the setting for disabling the AirPlay Receiver moved to Settings -> General -> AirDrop & Handoff:

Alternatively use a different port, it is a simple solution.

firebase serve -p 5001

For Windows Users:

netstat -ano|findstr "PID :5000"

And then with the Process ID (PID) found at the end of the line.

taskkill /pid FOUNDPID /F

Command taskkill does not work from within terminal of VS Code context. It needs an (elevated) CMD-prompt or equivalent Powershell environment in order to successfully terminate the listening on 127.0.0.1:5000.

lsof -t -i tcp:5000 | xargs kill

A one-line alternative for Mac users that pipes the the process ID directly to kill. h/t @manav

Original question was for Windows, but might be useful for others as question is now ranked highly in search results.

Port 5000 and 7000 are taken by airplay on MacOS Monterey.

Switch off Airplay Receiver as suggested here or

update firebase.json with a different port

"emulators": {
   
    "hosting": {
      "port": 5004
    }
}

The thing here is your port No 5000 is running with some process. So, first, you need to kill that process.

Find process id in Ubuntu

sudo lsof -i :5000

Suppose you get PID 14541

Kill the process

sudo kill -9 14541

A similiar problem has recently been reported in the official github repo: https://github.com/firebase/firebase-tools/issues/1606.

It is caused by a bug in a dependency (node portfinder), as you can see here. https://github.com/http-party/node-portfinder/pull/86

A quick fix to edit it might be to use the old version of node portfinder (v 1.0.21). Alternatively, you can do it by editing node_modules/firebase-tools/lib/emulator/controller.js and changing yield pf.getPortPromise({ port, stopPort: port }) to yield pf.getPortPromise({ port, stopPort: port + 1 }).

EDIT: As suggested by Mladen Skrbic, in order to find the firebase-tools folder, you should run npm root -g and find the firebase-tools folder in there.

This should fix the issue!

This worked for me.

Just restart your system.

just run command

firebase serve --only functions --host 0.0.0.0

Running this command did the trick for me:

firebase emulators:start --only firestore

also close this window:

Try this way:

firebase serve --only functions -p 5002

macOS Monterey 12.2 user here. I've simply changed the port to 5005 and it worked like a charm.

{
  "hosting": {
    "public": "functions/browser",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ],
    "rewrites": [
      {
        "source": "**",
        "function": "ssrapp"
      }
    ]
  },
  "emulators": {
    "hosting": {
      "port": "5005"
    }
  }
}

Instead of latest firebase-functions(which is 3.2.0 currently), forcing it to stay at 3.0.2 solved in my case.

    "dependencies": {
        "firebase-admin": "^8.2.0",
        "firebase-functions": "3.0.2",
        ...
    }

(Also I am using firebase-tools version 7.0.2 atm, didnt check it with latest. If it doesnt work try reverting firebase-tools to 7.0.2)

A quick fix

npm i -g [email protected]

SOLUTION TO:

Firebase serve error: Port 5000 is not open. Could not start functions emulator

If you get one of the following error messages when you run Firebase, you can easily resolve the problem by switching to another version of Firebase tools.

If you are using version 6 of Firebase Tools, you might switch to latest version (6.12.0), or you might try v7.2.2. To change to Firebase Tools version run to following node package manager command:

npm install -g [email protected]

{
  "firestore": {
    "rules": "firestore.rules",
    "indexes": "firestore.indexes.json"
  },
  "functions": {
    "source": "functions"
  },
  "hosting": {
    "public": "public",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ]
  },
  "emulators": {
    "auth": {
      "port": 9099
    },
    "functions": {
      "port": 5001
    },
    "firestore": {
      "port": 8080
    },
    "hosting": {
      "port": 5005
    }
  }
}

I'm using macOS Monterey 12.6 , I just changed the hosting port to "5005" , and it's working fine to me

If firebase serve --host 127.0.0.1 solves it for you; maybe you haven't set up your hosts file. Linux - Network configuration

As suggested here https://github.com/firebase/firebase-tools/issues/2856#issuecomment-902411134

Upgrading Node.js is working.

I just upgraded Node to 14.17.5. This solves the problem. I just press Ctrl+C to stop all emulators.

close everything, delete your "prefetch" and "%temp%" in "run" option and restart your PC. that worked for me

first, close all tab restart VS code then just go in firebase.json file then change ui port number then start again, it will work!

    "ui": {
      "enabled": true,
      "port": "enter any number"
    }

I faced the same issue not quite long ago.

I found out I had firebase running on another terminal on my computer.

So before you try firebase serve, check if it is running on another terminal.

I hope it solves your problem just like mine.

firebase serve --only functions --port

For me, it wasn't working when a VPN was on.