CODEWITHSUNDEEP
javascriptnode.js
rksh
rksh

Reputation: 4050

Javascript object returns undefined NodeJs

I'm trying to get Facebook user profile info using the Graph API in nodejs where I am making the following request.

    var url = 'https://graph.facebook.com/v2.6/' + id
    var qs = {fields:'first_name,last_name',access_token:token}

    request({
        url: url,
        method: 'GET',
        qs
    }, function(err, response, body){
        var name = body.first_name
        var message = "Hey there " + name
    })
}

The request response from the server looks like this

{
  "first_name": "Peter",
  "last_name": "Chang"
}

However, the name is returned as undefined. But if I make the call like this.

    var url = 'https://graph.facebook.com/v2.6/' + id
    var qs = {fields:'first_name,last_name',access_token:token}

    request({
        url: url,
        method: 'GET',
        qs
    }, function(err, response, body){
        var name = body
        name = JSON.jsonstringify(body)
        var message = "Hey there " + name
    })
}

It gives an output like this,

   Hey there {"statusCode":200,"body":"{\"first_name\":\"Peter\",\"last_name\":\"Chang\"}"}

So why is the name is returned as undefined in the first example. What am I doing wrong? Please can someone explain. Thanks

Upvotes: 0

Views: 727

Answers (3)

MrWillihog
MrWillihog

Reputation: 2646

I believe you have to tell request that you're dealing with a JSON response. You can use the json: true property in your request.

request({
  url: url,
  method: 'GET',
  qs,
  json: true
}, function (err, res, body) {
  var name = body.first_name
  var message = "Hey there " + name
});

From the request docs:

json - sets body to JSON representation of value and adds Content-type: application/json header. Additionally, parses the response body as JSON.

Upvotes: 1

Walle Cyril
Walle Cyril

Reputation: 3247

You need to parse the body. To do that you can use the body-parser module

see

https://www.npmjs.com/package/body-parser#examples

Upvotes: 0

Ant Kennedy
Ant Kennedy

Reputation: 1240

I would say it is because the response has not been parsed and is therefor sill a string. Are you using nodes http module?

var url = 'https://graph.facebook.com/v2.6/' + id
var qs = {fields:'first_name,last_name',access_token:token}

request({
  url: url,
  method: 'GET',
  qs
}, function(err, response, body){
  var data = JSON.parse(body);
  var name = data.first_name
  var message = "Hey there " + name
});

Upvotes: 1

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