Export a variable from a function in Javascript

Question

All I want is take userId variable's value to use anything.

async function getMyData(){
    const token = '';
    spotifyApi.setAccessToken(token);
    
    const data = await spotifyApi.getMe();
    let userId = data.body.id;

    return userId;
}

const userId = getMyData();
console.log(userId)

console.log(userId) saying me this: {Promise <pending<}

Because I will export getMyData function to another .js file and then i will run getMyData to learn user's spotify id. — questiontoansw
– questiontoansw, Commented May 10, 2021 at 20:23
var getMyData = require('getMyData') ||||||| console.log(getMyData) |||| results: {promise <pending>} (it didnt work too) — questiontoansw
– questiontoansw, Commented May 10, 2021 at 20:27
when i use await getMyData() results are saying: "SyntaxError: await is only valid in async functions and the top level bodies of modules" ): — questiontoansw
– questiontoansw, Commented May 10, 2021 at 20:31

Mak · Accepted Answer · 2021-05-10 20:34:34Z

3

With any async functions, don't forget to use await before function execution


/// ./getMyData.js
export async function getMyData(){
    // ...

    return userId;
}

/// ./otherFile.js

import {getMyData} from './getMyData.js'

(async function () {
   const userId = await getMyData();
   console.log(userId)
})()

edited May 10, 2021 at 20:34

answered May 10, 2021 at 20:26

Mak

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2 Comments

questiontoansw Over a year ago

This is error when i try your code : (SyntaxError: await is only valid in async functions and the top level bodies of modules)

Mak Over a year ago

@questiontoansw because you should call this await getMyData() also in async scope

Nisanth Reddy · Accepted Answer · 2021-05-10 20:28:48Z

2

you are using async await features in your code.

Thus the return type of your getMyData would actually be a Promise object. More about Promises here

Now, heres how you can use your function in another file without having to use the await keyword.

import { getMyData } from '%your file path%';

getMyData().then(function(userId) {
   // use the value of userId here
   console.log(userId);
}

answered May 10, 2021 at 20:28

Nisanth Reddy

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