Javascript Require

Question

include.js file contain

var test = function(){
    console.log("log from included file");
};

main.js file contain

require('./include.js');
test();

when i tried to run main.js using node main.js command it shows

module.js:340
    throw err;
          ^
Error: Cannot find module 'include.js'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (d:\Nishada\test\main.js:1:63)
    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)

what is the reason for this error ?

Answer 1

You will need to export the test function in order to use it in main.js

var test = function(){
    console.log("log from included file");
};

module.exports = test

And in main.js add require as follows

require('./include.js'); // assuming include.js is in same directory as main.js

If you do require('include.js') then node will search include in global packages

Answer 2

The error refers to a file not being found, make sure your file is in the same directory as main.js and try:

include.js

module.exports = {
    test: function(){
        console.log("log from included file");
    }
}

main.js

var myInclude = require('include.js');
myInclude.test();

Answer 3

You will have to give relative path of include.js while require .

If both are in same directory write it like bellow

var include = require('./include.js');
include.test();

and from include.js you can define them as function for exports

exports.test = function(){
    console.log("log from included file");
};

Even Better

export just one object having multiple functions from include.js instead of exporting each separate function.

Like bellow

include.js

exports.test = obj;
obj.func1 = function(){};
obj.func2 = function(){};

main.js

var test = require('./include.js').test;
test.func1();
test.func2();