NickName:mitmath514 Ask DateTime:2019-01-02T03:54:08

Node.js Express: TypeError: object is not a function

When I run the following code:

var app = require('express')();
var http = require('http').Server(app);

app.get('/', function(req, res){
    res.send('<h1>Hello world</h1>');
});

http.listen(3000, function(){
    console.log('listening on *:3000');
});

I get the following error:

/var/www/html/test.me/public_html/giftcard/index.js:1
rts, require, module, __filename, __dirname) { var app = require('express')();
                                                                           ^
TypeError: object is not a function
    at Object.<anonymous> (/var/www/html/test.me/public_html/giftcard/index.js:1:91)
    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

What does this error mean? Is the path to express incorrect? I have one directory with packages.json, index.js (the file above), and node_modules, and I have express installed. Where is the error coming from?

Copyright Notice：Content Author:「mitmath514」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/53998493/node-js-express-typeerror-object-is-not-a-function

Answers

quirimmo 2019-01-01T20:11:06

The error should be at this line: \n\nvar http = require('http').Server(app);\n\nFor what you are trying to do, you simply need express without http\n\nconst app = require('express')();\n\napp.get('/', function(req, res){\n res.send('<h1>Hello world</h1>');\n});\n\napp.listen(3000, () => console.log('listening on 3000'));\n\n\nIf you want to use also http, try using this syntax:\n\nconst app = require('express')();\nconst server = require('http').createServer(app);\nserver.listen(3000);\n",

gaaaaaa 2019-01-01T20:01:53

Why are you using this:\n\nvar app = require('express')();\nvar http = require('http').Server(app);` \n\n\nwhile you can do like this :\n\nvar app = new require('express')();\n\napp.get('/', function(req, res){\n res.send('<h1>Hello world</h1>');\n});\n\napp.listen(3000, function(){\n console.log('listening on *:3000');\n});\n\n\nHowever, your code works perfectly on my node.js .\n\nvar app = new require('express')();\nvar http = require('http').Server(app);\n\napp.get('/', function(req, res){\n res.send('<h1>Hello world</h1>');\n});\n\nhttp.listen(3000, function() {\n console.log('listening on *:3000')\n});\n",