portcheck

Name: portcheck
Author: roystondwork-dev

by roystondwork-devversion 0.14.0i★ 2iRuns on your computer

Registry nameio.github.roystondwork-dev/portcheck

How to install

What it does

See which process holds a port, find free ports, and stop a dev server safely.

Connects Runs on your computer
Account or key No key needed
Category Other

Install

Pick the AI app you use, then copy the settings.

Passed 3/3 checks · Runs on your computer

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "mcpServers": {
    "portcheck": {
      "command": "npx",
      "args": [
        "-y",
        "portcheck-cli",
        "mcp"
      ]
    }
  }
}

Done

Quit Claude and open it again
Done
Try it
Use portcheck and tell me what you can do for me, then show me one thing
✓ If Claude says it is using portcheck or shows a portcheck tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect portcheck yet

portcheck runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect portcheck

Steps for Claude →Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →Install Node.js on your computer first (one time)
Steps for Cursor →Install Node.js on your computer first (one time)
Steps for VS Code →Install Node.js on your computer first (one time)

B · Others in Other that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Hostinger✓ ChatGPT
World Monitor✓ ChatGPT
Svelte MCP✓ ChatGPT

Works with Claude Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --scope user portcheck -- npx -y portcheck-cli mcp

Done

Type /mcp in Claude Code
You should see portcheck listed as connected
Done
Try it
Use portcheck and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using portcheck or shows a portcheck tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use portcheck and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using portcheck or shows a portcheck tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use portcheck and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using portcheck or shows a portcheck tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use portcheck💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user portcheck -- npx -y portcheck-cli mcp

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "portcheck": {
      "command": "npx",
      "args": [
        "-y",
        "portcheck-cli",
        "mcp"
      ]
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "portcheck": {
      "command": "npx",
      "args": [
        "-y",
        "portcheck-cli",
        "mcp"
      ]
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "portcheck": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "portcheck-cli",
        "mcp"
      ]
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 2
Downloads per weeki: 95/wk
Licence i: MIT
Connection: Runs on your computer
Transport: stdio
Latest versioni: 0.14.0
Categoryi: Other
Published to registryi: Nov 11, 2026
Code last changedi: Nov 11, 2026
Maker: roystondwork-dev
Packages: npm: portcheck-cli
Repo: roystondwork-dev/portcheck
Website: roystondwork-dev.github.io
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 12, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account roystondwork-dev, which owns the repo
✓ Pass
Still maintained
Code last changed yesterday
✓ Pass
Has a licence
Uses MIT
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Otheri

More stars than 90% of the other 19298 servers in this category
Published to the registry more recently than 97% of the other 19298 servers in this category
Basic checks equal to or better than 100% of the other 19298 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is portcheck safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed yesterday, and the latest version (0.14.0) reached the registry yesterday.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: World Monitor, Claude Flow, Tldraw

Others in the same category

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

World Monitor

Real-time global intelligence on conflict, markets, energy, trade, shipping and cyber. 102 tools.

by koala73Widely used★ 90.5KUpdated today

Runs in the cloud✓ service owner · worldmonitor.app

Install

Claude Flow

AI orchestration with hive-mind swarms, neural networks, and 87 MCP tools for enterprise dev.

by ruvnetWidely used↓ 13.5K/wk★ 81.5KUpdated 14 months ago

Runs on your computer

Install

Tldraw

Draw and visually collaborate with your agents on tldraw's canvas.

by tldrawWidely used★ 51.4KUpdated 8 months ago

Runs in the cloud

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

portcheck

See what's using your ports, find free ones, free them up, and check remote hosts.

One static binary for macOS, Linux and Windows.

Port already in use?

npx portcheck-cli kill 3000

portcheck shows what holds the port and who started it, asks, then stops it gently (and never touches system processes). It's a safer kill-port, with nothing to install first.

Fixes for the error you're seeing: Node.js, Next.js, Vite · Python, Django, Flask · Docker · Rails, Spring Boot, Go, .NET, PHP · macOS · Windows · Linux

Features

	Command
🔍	`portcheck list -l`	Every listening socket with its process, PID and user
✅	`portcheck 3000`	Is the port free? If not, who holds it? Exit code 0 or 1 for scripts
🆓	`portcheck free 3000-3999 -n 3`	Free ports, verified by actually binding them
🛑	`portcheck kill 8080`	Graceful SIGTERM, then SIGKILL; refuses PID 1, your shell and system processes
🧹	`portcheck servers --older-than 1d`	The dev servers you forgot: your listening processes with their project and uptime, oldest first; `--stop` to clean up
📡	`portcheck scan db.internal -p 5432`	Rate-limited TCP connect checks of remote hosts. No root needed
⏳	`portcheck wait db:5432 -t 60s`	Block until services accept connections, or until a port is free. Built for CI
▶️	`portcheck run --port 3000 --next -- npm run dev`	Start a command on a free port (`$PORT`, `{port}`); take the next one or stop the holder
🩺	`portcheck doctor`	Check the ports listed in `.portcheck.yaml` and get a fix for each problem
🖥️	`portcheck`	Live, sortable, filterable TUI. Stop processes without leaving it
🌐	Browser extension	Edge (and Chrome): which process serves a localhost tab, `off` when nothing listens, stop it from the popup (guide)
🧩	VS Code extension	"Port in use" errors in the terminal become one-click fixes; listening ports in the sidebar (guide)
🤖	`portcheck mcp`	AI assistants (Claude Code, Cursor, Copilot…) check and free ports themselves (guide)
⌨️	Raycast	Search Ports, Check Port, Kill Port and Find Free Port from the Mac launcher
✍️	Neovim	`:Portcheck` picker, check/kill/free, and "port in use" in `:terminal` → stop it
🔌	Menu bar / tray app	Your listening ports in the macOS menu bar or Windows/Linux tray: stop, open, copy in two clicks
🧠	JetBrains plugin	IntelliJ IDEA, WebStorm, PyCharm, GoLand…: "port in use" in Run/Debug → Stop it and rerun; a Ports tool window

VS Code extension

When a dev server fails because its port is taken, the extension says who holds it and fixes it: stop it and re-run, or re-run on the next free port.

Install Portcheck - Port in Use Fixer from the VS Code Marketplace (search "portcheck" in VS Code) or Open VSX (VSCodium, Cursor, Windsurf). portcheck is built in.

JetBrains plugin

In IntelliJ IDEA, WebStorm, PyCharm, GoLand and the other JetBrains IDEs, when a run configuration fails because its port is taken, a notification names the process and offers Stop it and rerun; the Ports tool window lists every listening port.

▶ Watch the 20-second demo

Install portcheck-jetbrains- .zip from the latest release (Settings → Plugins → ⚙ → Install Plugin from Disk…); it is in review on JetBrains Marketplace (guide).

Browser extension

On every localhost tab, a badge names the process serving it, or says off when nothing is listening; the popup shows who started it and stops it safely.

Install Portcheck - Localhost Port Inspector from Microsoft Edge Add-ons, then run portcheck browser install once. For Chrome, Brave and Chromium, load the zip from the latest release (guide).

Highlights

Same commands and output on every OS. It replaces lsof -i, netstat -ano, ss -ltnp and kill.
Built for scripts. --json follows a versioned schema, exit codes are stable, and results go to stdout while messages go to stderr.
Container- and WSL-aware. Ports published by Docker/Podman or forwarded from WSL show the container or distro, and kill tells you how to stop it there instead of killing the proxy.
Honest about permissions. Hidden owners are shown as hidden, with a hint on how to see them.
A Go library too. See pkg/.

Install

# Homebrew (macOS, Linux)

brew install roystondwork-dev/tap/portcheck

winget (Windows; the package is waiting for Microsoft's review)

winget install roystondwork-dev.portcheck

Scoop (Windows)

scoop bucket add portcheck https://github.com/roystondwork-dev/scoop-bucket scoop install portcheck

npm (any OS): run it without installing

npx portcheck-cli 3000

PyPI (any OS)

pipx install portcheck-tool

Go 1.26+

go install github.com/roystondwork-dev/portcheck/cmd/portcheck@latest

.deb, .rpm, .apk and archives for amd64/arm64 are on the releases page. The checksum file covering every artifact is signed with cosign (keyless), and releases ship SBOMs and SLSA provenance; see verifying downloads.

Quickstart

$ portcheck 3000

PORT PROTO STATUS PID PROCESS USER 3000 tcp in-use 42379 node alice

$ portcheck kill 3000 About to terminate: PID 42379 node (port 3000) Proceed? [y/N] y PID PROCESS RESULT DETAIL 42379 node terminated

$ portcheck free 3000-3999 -n 2 -o plain PORT 3000 3001

$ portcheck list -l --json | jq '.data.sockets[] | {port: .localPort, name: .process.name}'

📖 Documentation: https://roystondwork-dev.github.io/portcheck/ (quickstart · guides · CLI reference · permissions by OS · FAQ)

Use as a Go library

res, err := inspect.NewSystem().List(ctx, inspect.Filter{Ports: portspec.Single(3000), ListeningOnly: true})

if err != nil { log.Fatal(err) } for _, s := range res.Sockets { if s.Process != nil { // nil when the owner is hidden from your user fmt.Println(s.PID, s.Process.Name) } }

See the library guide for portspec, inspect, freeport, killer, scan, waitfor and containers.

Responsible use

portcheck scan makes ordinary TCP connections and has no stealth features. Only scan hosts and networks you own or are authorized to test.

Contributing

Contributions are welcome! See CONTRIBUTING.md for setup and standards (every change is tested on Linux, macOS and Windows, with a 100% coverage gate on the library), and TASKS.md for the roadmap and status. Please follow the Code of Conduct, and report vulnerabilities privately as described in SECURITY.md.

portcheck

What it does

Install

Install Node.js

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Otheri

Common questions

Others in the same category

World Monitor

Claude Flow

Tldraw

README from the maker

Port already in use?

Features

VS Code extension

JetBrains plugin

Browser extension

Highlights

Install

winget (Windows; the package is waiting for Microsoft's review)

Scoop (Windows)

npm (any OS): run it without installing

PyPI (any OS)

Go 1.26+

Quickstart

Use as a Go library

Responsible use

Contributing

License