PORT 8787 / TCPDev & LocalhostExposure Risk: Low

Port 8787: Cloudflare Workers (Wrangler Dev) — Cloudflare Wrangler Local Edge Runtime (workerd)

Default local development port when running `npx wrangler dev` for Cloudflare Workers and Pages Functions.

Default Service

Cloudflare Workers (Wrangler Dev)

Process: workerd / node

Transport Protocol

TCP

IANA Registered Port 8787

Docker Port Flag

-p 8787:8787

Container to Host Mapping

How to Check & Kill Process on Port 8787 (EADDRINUSE Fix)

macOS & Linux (lsof / kill)

# Find process using port 8787
sudo lsof -i :8787

# Instantly kill process on port 8787
lsof -ti:8787 | xargs kill -9

Windows (PowerShell & CMD)

# Find PID listening on port 8787
netstat -ano | findstr :8787

# Force kill by PID
taskkill /PID <PID_NUMBER> /F

Cross-Platform Node.js One-Liner

# Kill port 8787 via npx
npx kill-port 8787

# Or diagnose via Castov CLI
npx castov fix "EADDRINUSE :::8787"

Linux Firewall (UFW) & Connectivity Test

# Test if port 8787 is reachable
nc -zv localhost 8787

# Allow or deny port 8787 in UFW
sudo ufw allow 8787/tcp

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Frequently Asked Questions about Port 8787

What is Port 8787 used for?

Port 8787 is the standard network port for Cloudflare Workers (Wrangler Dev) (Cloudflare Wrangler Local Edge Runtime (workerd)) operating over TCP. The typical system daemon or process is workerd / node.

How do I kill a process running on Port 8787 (EADDRINUSE)?

On macOS and Linux, run: lsof -ti:8787 | xargs kill -9 (or npx kill-port 8787). On Windows PowerShell/CMD, run: netstat -ano | findstr :8787 and then taskkill /PID <PID> /F.