将变量值从 index.js 访问到 nodejs 上的另一个 js 文件

Question

I am new to nodejs and I have index.js file which is called when I start my nodejs express server using nodemon index command.

In this index.js file I am connecting to google drive and getting jwtClient object when the connection is successful.

I want to use this jwtClient object in product.js file to upload image to google drive.

In index.js file once I have value in jwtClient variable I am doing module.exports = jwtClient; and I am accessing jwtClient in product.js as const jwtClient = require('../index'); which is not working.

What are the ways I can access jwtClient in product.js from index.js without creating new object and having the same object reference.

In index.js file:

// configure a JWT auth client
let jwtClient = new google.auth.JWT(
    privatekey.client_email,
    null,
    privatekey.private_key,
    ['https://www.googleapis.com/auth/drive']);
//authenticate request
jwtClient.authorize(function (err, tokens) {
    if (err) {
        console.log(err);
        return;
    } else {
        console.log("Successfully connected to gdrive!");
    }
});

module.exports = jwtClient;

In product.js file

const jwtClient = require('../index');

Answer 1

The problem may be that when you examine your jwtClient variable, the jwtClient.authorize did not execute yet. Make sure that in product.js file you wait till it happen. The easyest (but not best) way to do that is

const jwtClient = require('../index/jwtClient');

setTimeout(function() {
  console.dir(jwtClient);
}, 1000);

Answer 2

The issue was that I was exporting literal instead of Object. So the code module.exports = jwtClient; exports literal but jwtClient is object so I used exports.jwtClient = jwtClient; in index.js file and then I access it in product.js file as

const index = require('../index.js');
console.log(index.jwtClient);

reference https://www.tutorialsteacher.com/nodejs/nodejs-module-exports