Question

150

NodeJS: Good way to write Multiple API Calls in serial

rated 0 times [ 155] [ 5] / answers: 1 / hits: 16144 / 7 Years ago, sun, february 19, 2017, 12:00:00

Is there a better/more beautiful way to call multiple APIs after another (in serial) as in my example?

  var request = require('request');



  request('http://www.test.com/api1', function (error, response, body) {

    if (!error && response.statusCode == 200) {



      request('http://www.test.com/api1', function (error, response, body) {

        if (!error && response.statusCode == 200) {



          request('http://www.test.com/api1', function (error, response, body) {

            if (!error && response.statusCode == 200) {



              //And so on...



            }

          })



        }

      })



    }

  })

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monica

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2 Years ago

answered 7 Years ago tylerdamiena · Accepted Answer

Depending on which version of node you are using, promises should be native...

https://nodejs.org/en/blog/release/v4.0.0/

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise

var request = require('request');



getRequest('http://www.test.com/api1').then(function (body1) {

    // do something with body1

    return getRequest('http://www.test.com/api2');

}).then(function (body2) {

    // do something with body2

    return getRequest('http://www.test.com/api3');

}).then(function (body3) {

    // do something with body3

    //And so on...

});



function getRequest(url) {

    return new Promise(function (success, failure) {

        request(url, function (error, response, body) {

            if (!error && response.statusCode == 200) {

                success(body);

            } else {

                failure(error);

            }

        });

    });

}