How To Install Express, a Node.js Framework, and Set Up on a VPS...Part 4: The Server Code

Following the tutorial mentioned above, part 4, rewriting app.js, I get this error, any suggestion on how to correct it? /root/socketio-test/app.js:9 var app = express(); ^ TypeError: object is not a function at Object.<anonymous> (/root/socketio-test/app.js:9:11) at Module.compile (module.js:456:26) at Object.Module.extensions…js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Function.Module.runMain (module.js:497:10) at startup (node.js:119:16) at node.js:902:3


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express() can be used to create a server in express 3.x.x but in earlier versions the command would be

var app = express.createServer();

That would be the most common reason for the issue you’re seeing. The other possibility is that express was not installed properly via npm, re-doing the install may correct this if changing the express() call does not.