From 7da7c43fcecdea4d40c573f5aba33fada93f4dae Mon Sep 17 00:00:00 2001
From: Ilya Diallo <ilya.diallo@gmail.com>
Date: Mon, 22 Feb 2016 22:40:01 +0100
Subject: [PATCH] #510 Detect when the port you are trying to run the server on
 is already in use.

---
 src/index.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/index.js b/src/index.js
index 36f94284..344bac89 100644
--- a/src/index.js
+++ b/src/index.js
@@ -188,6 +188,17 @@ function ParseServer({
 
   api.use(middlewares.handleParseErrors);
 
+
+  process.on('uncaughtException', (err) => {
+    if( err.code === "EADDRINUSE" ) { // user-friendly message for this common error
+      console.log(`Unable to listen on port ${err.port}. The port is already in use.`);
+      process.exit(0);
+    }
+    else {
+      throw err;
+    }
+  });  
+
   return api;
 }