Express.js: Async issue while API-call

Question

I really like programming with node.js and especially express.js. Today I run into the typically async issue. I read a lot about these issues and possible solutions, but what is best practice for express.js?

I tried to transfer the callback approach, but it doesn't work. I have to admit, I am a kind of greenhorn in the field and I would appreciate possibly solutions from the community :).

I think the issue in the following code is, that the function call getUserDataFromSpotify(cookieAccessToken) is async and the next row can't get the id of the inputData variable as fast as the function returns a value.

app.get('/landingpage', function(req, res){
  var cookieAccessToken = req.cookies.access_token;
  var inputData = getUserDataFromSpotify(cookieAccessToken);
  res.render('UserProfile', {display_name: inputData.id});
});

function getUserDataFromSpotify(userToken){
 var options = {
   url: 'https://api.spotify.com/v1/me',
   headers: { 'Authorization': 'Bearer ' + userToken },
   json: true
 };
 request.get(options, function(error, response, body) {
      console.log(response.statusCode);
      console.log(body);
      return body;
});
}

You are trying to use a async function as a synchronous function which is wrong in in NodeJS. — Mustafa Mamun, May 21 '18 at 08:34
Thank's for your comment, Mustafa! Is there any solution that works for API calls in this way? — tobsonponte, May 21 '18 at 08:39
I was trying to answer but not possible any more. Try promise, callback or async function structure to resolve the async call first and then do the res.render — Mustafa Mamun, May 21 '18 at 08:43

Express.js: Async issue while API-call

0 Answers0