I am trying to run two node.js application in my development machine but the second application throwing the following exception while running.
Is there any way to run these two applications in parallel way ?
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3Are both applications trying to run on port 3000?Tom– Tom2014-08-27 12:53:30 +00:00Commented Aug 27, 2014 at 12:53
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Explaining the actual error: EADDRINUSE means 'error, address in use'. See gnu.org/software/libc/manual/html_node/Error-Codes.html for the meanings of all these errors.mikemaccana– mikemaccana2014-08-27 12:59:17 +00:00Commented Aug 27, 2014 at 12:59
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3 Answers
You need to use a different port since 3000 is already in use.
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(3001, "127.0.0.1");
Comments
Address is already in use, you should change the port from for example 3000 to 3001 for the second instance of the script.
Comments
You can't bind two sockets on the same port. Hence the error.
The usual good practice is to rely on the PORT environment variable so as to be able to quickly change the listening port from the command line.
var http = require('http');
var port = process.env.PORT || 3000;
http.createServer().listen(port);
Then launch your application:
$ PORT=8080 node app.js
See here for cross-platform instructions on how to define environment variables from the command line.
