Unable to access response object data outside the function in node js

问题

I am using node js and making a call to spotify API and receive the response in body object, as shown in below code:

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

This gives me output:

But now when I try to access the body object outside the function I get undefined. I think the problem is that I am making an asynchronous call and so before the response is received the statements where I make use of body variable outside function are executed. But I am a bit confused about how to get to the solution.

Any help is appreciated

Edit:

    request.get(options, function(error, res, body) {
        console.log(body)
        response.render('user_account.html', {
                data: body
        })
    });

And it gives the output:

回答1:

Use promise.

You can try following:

const apiCall = () => {
  return new Promise((resolve, reject) => {
    var options = {
          url: 'https://api.spotify.com/v1/me',
          headers: { 'Authorization': 'Bearer ' + access_token },
          json: true
    };
    request.get(options, function(error, res, body) {
          if(error) reject(error);
          console.log(body);
          resolve(body);
    });
  });
}

apiCall().then((body) => {
    // do your things here
})
.catch((err) => console.log(err));

来源：https://stackoverflow.com/questions/52258510/unable-to-access-response-object-data-outside-the-function-in-node-js