Access function in another module.export in a separate file

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I have several javascript files that contain different parts of my node application. They are required using the logic below. I want to access a function in one file1.js from file2.js, but have had little success so far. Any help would be appreciated, thanks.

app.js: This is the file where I start my server and include all the express routes.

require(path_to_file+'/'+file_name)(app, mongoose_database, config_file);  //Require a bunch fo files here in a loop.

file1.js: This is an example file that is required using the code above.

module.exports = function(app, db, conf){
  function test() {  //Some function in a file being exported.
    console.log("YAY");
  }
}

file2.js: This is another file required using the code above. I want to access a function in file1.js from within this file (file2.js).

module.exports = function(app, db, conf){
  function performTest() {  //Some function in a file being exported.
    test();
  }
}
file1.js
module.exports = function(app, db, conf){
  return function test() {
    console.log("YAY");
  }
}

Note you need to return the function.

file2.js
module.exports = function(app, db, conf){
  return function performTest() {
    var test = require('./file1')(app, db, conf);
    test();
  }
}
(some other file)
var test = require('./file2')(app, db, conf);
test();

or

require('./file2')(app, db, conf)();

How to use module.exports in Node.js, A module is a discrete program, contained in a single file in Node.js. able to import this module and access its functionality from another module. As you can see, this is not that different from how we exported functions and variables before. How to use functions from another file in Node.js using module.exports. Understanding Node.js Require and Exports. In Node.js, all variables, functions, classes are visible to each other only within the same file. We are able to call functions from any other file. To do this, we will use require and module.exports.

The function you have right now in file1 is scoped only to the function within the exports. Instead, you want to export an object with each function being a member of that object.

//file1.js
module.exports = {
    test: function () {
    }
};


//file2.js:
var file1 = require('./file1.js');
module.exports = {
    performTest: function () {
        file1.test();
    }
}

Node.js Modules: Learn how to Import and use Functions from , To access the module functions, we have to export the functions and import To include functions defined in another file in Node.js, we need to import the functions and values, and also different types of modules in Node.js. If you want to name the function in its own file. This is probably the best option in general, if only because you may want to put more than one function in a single file. Next, let’s make our function in the file fun.R: mult - function(x, y) { x*y} If you get the warning message “In readLines(file) : incomplete final line found on ‘fun.R

In ECMAScript6 and above editions you can do it by export and import keywords.

First,implement and export an arrow function in a separate js file:

//file1.js
export const myFunc = () => {
    console.log("you are in myFunc now");
}

Then,import and call it in other files:

//otherfile.js

import { myFunc } from 'file1';

myFunc();

If you want to more about Arrow functions

How to use functions from another file in Node.js using module.exports, We are able to call functions from any other file. To do this, we will use require and module.exports . First, create 2 files with which we work, server� My call function is shown below.I would like to pass the x=0.4 to the function above and obatin a new x value.The new x value should be able to override the old x value used.How do I go about it with wrapping the x=a*x*(1-x) in a for loop?

Understanding module.exports and exports in Node.js, Different Module Formats. As JavaScript Then in the index.js file, we're importing this function and executing it. Also notice that in the require� Module exports are the instruction that tells Node.js which bits of code (functions, objects, strings, etc.) to “export” from a given file so other files are allowed to access the exported code. (Don’t worry, we’ll cover importing code in the next section.)

Everything you should know about 'module' & 'require' in Node.js, Node.js treats each JavaScript file as a separate module. enclosed within different functions, these functions will not be able to access the code of each other. The five parameters — exports , require , module , __filename� The export statement is used when creating JavaScript modules to export live bindings to functions, objects, or primitive values from the module so they can be used by other programs with the import statement. Bindings that are exported can still be modified locally; when imported, although they can only be read by the importing module the value updates whenever it is updated by the exporting

JavaScript modules, Throughout this article, we've used .js extensions for our module files, but in The first thing you do to get access to module features is export them. different functions of the same name into the same top-level module file,� In this way, you can export and import a local module created in a separate file under root folder. Node.js also allows you to create modules in sub folders. Let's see how to load module from sub folders. Load Module from the Separate Folder. Use the full path of a module file where you have exported it using module.exports.

Comments
  • Thanks for the reply. This method works if I have one function in a module.export, however if I have multiple functions in a file all in a module.export, how do I access those. Is there a way to access the functions like this: var file1 = require('./file1')(app,db,conf); and then file1.test()
  • Sure. Just have your exported function return an object with the property test whose value is a function. The discussion from this question may be helpful.
  • Hey I tried playing around with this method, but I couldn't get it to work. If I use your exact syntax I get an error point at the unexpected parenthesis () after the word funtion
  • Should note that you need a compiler. It won't just "work".