CODEWITHSUNDEEP
javascriptarraysnode.jsfor-loopasynchronous
Matias Rodriguez
Matias Rodriguez

Reputation: 35

For each Request from an array Node.js

I have this example array

[{
  "car": "Toyota",
  "ID": "1",
  "Doors": "4",
  "price": "0"
}, {
  "car": "Chevrolet",
  "ID": "2",
  "Doors": "2",
  "price": "0"
}, {
  "car": "Dodge",
  "ID": "3",
  "Doors": "2",
  "price": "0"
}]

How can I do a request for all ID in array, and the results of all IDs return it in the array price.

request(
  'http://steamcommunity.com/market/priceoverview/?currency=1&appid=730&market_hash_name='+ID,
  function (e, r, body){
    var req_data = JSON.parse(body);
  }
)

Thank you!

Upvotes: 0

Views: 2185

Answers (2)

Patrick Roberts
Patrick Roberts

Reputation: 51866

You can use any of the interface wrappers recommended by request and Promise.all(). For example, using native promises and following this example:

const request = require('request-promise-native')

Promise.all(array.map(({ ID }) => request({
  uri: `http://steamcommunity.com/market/priceoverview/?currency=1&appid=730&market_hash_name=${ID}`,
  json: true
})).then(data => {
  // each of the response objects in the same order as initial array
  data.forEach(objRes => console.log(objRes))
}).catch(error => {
  // handle the first rejected error here
})

Upvotes: 1

Jason Sperske
Jason Sperske

Reputation: 30416

You can use async.map to do this. Using your code as a starting point it might look like this (I changed the URL to a site that I know echoes JSON):

var request = require('request');
var async = require('async');
var data = [{
              "car": "Toyota",
              "ID": "1",
              "Doors": "4",
              "price": "0"
            }, {
              "car": "Chevrolet",
              "ID": "2",
              "Doors": "2",
              "price": "0"
            }, {
              "car": "Dodge",
              "ID": "3",
              "Doors": "2",
              "price": "0"
            }];

async.map(data , function(item, callback) {
  request("https://randomvictory.com/random.json?id="+item.ID,
           function(error, response, body) {
             if(!error) {
               //having checked there was no error, you pass 
               //the result of `JSON.parse(body)` as the second
               //callback argument so async.map can collect the
               //results
               callback(null, JSON.parse(body));
             }
           });
}, function(err, results) {
  //results is an array of all of the completed requests (note
  //that the order may be different than when you kicked off
  //the async.map function)
  console.log(err, results);
});

Upvotes: 4

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