How do I call .js from another .js file?

This question already has an answer here:

In Node.js, how do I “include” functions from my other files? 20 answers

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You can create a module, and require it the following way.

File A: sql.js

var a = function a(){

};

module.exports.a = a;

Files B, C, D:

var sql = require("./sql");

sql.a();

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require .

for example var sql = require('sql.js');

you need in the sql.js to return an object at the end with module.exports = myobj ;

Example:

module.exports = {
 sql_connection: null,
 connect: function() {
    // connect to db
   this.sql_connection = ... ; // code to connect to the db
 }

};

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