export function with promise in nodejs - node.js

Question

I am trying to import a function from an external file I have, which contains a promise.
The resolution of the promise is what should be returned, but I get an error message:
The requested module './functions.js' does not provide an export named 'getOkapiToken'
The POST request works fine when I run it directly in the server, but I need it in a separate file as it will be used by several different files in the future.
This is also the first time I'm using promises, so I'm not sure I handled it properly (though I can't get any errors registered until I deal with the first one).
The functions.js file is built as follows:
import post from 'axios';
export function getOkapiToken(url, user, password) {
//Get username and password for API
const auth = {
"username": user,
"password": password
};
//Create headers for POST request
const options = {
method: 'post',
data: auth,
headers: {
'Content-Type': 'application/json',
'Content-Length': auth.length,
'X-Okapi-Tenant': 'diku'
}
};
//Make API post call
post(url+':9130/authn/login', options)
.then(response => {
return(response.headers['x-okapi-token'])
}).catch((err) => {
return(`There was an error 2: ${err}`)
})
}
And I try to import it as follows:
import { getOkapiToken } from './functions3.js'
import settings from './jsons/config.json';
let OkapiKey = await new Promise((resolve,reject) => {
//Call function to make API post call
let keytoken = getOkapiToken(settings.url,settings.userauth,settings.passauth)
console.log(`There was an error: ${keytoken}`)
if (keytoken.length == 201) {
resolve(keytoken)
} else {
reject('There was an error')
}
})
OkapiKey.then((data) => {
console.log(data)
})
.catch((err) => {
console.error('I have an error:'+err.code);
})

Answer 1

There are three ways to handle asynchronous task in Javascript and wit Node.JS
Pass in a Callback to run in the asynchronous code
Use a Promise that will either resolve or reject the promise
Use the async keyword in front of the function and place await in front of the asynchronous code.
With that said I was able to get the code to work by running a simple node server and I modified your code just a bit to get a response back from the server.
index.js
const { getOkapiToken } = require('./functions.js')
const settings = require('./settings.json')
var OkapiKey = getOkapiToken(settings.url,settings.userauth,settings.passauth)
OkapiKey
.then((data) => {
console.log('I have data'+ data.toString())
})
.catch((err) => {
console.error('I have an error:'+err.code);
})
functions.js
const post = require('axios');
const getOkapiToken = (url, user, password) =>
new Promise(function (resolve, reject) {
//Get username and password for API
const auth = {
"username": user,
"password": password
};
//Create headers for POST request
const options = {
method: 'post',
data: auth,
headers: {
'Content-Type': 'application/json',
'Content-Length': auth.length,
'X-Okapi-Tenant': 'diku'
}
};
post('http://localhost:3000/', options)
.then(response => {
resolve(response.data)
// if (response.headers['x-okapi-token']) {
// resolve(response.headers['x-okapi-token']);
// } else {
// reject((error));
// }
}).catch((err) => {
console.error('Response Error:'+err)
})
})
exports.getOkapiToken = getOkapiToken;