Filter Json Using Javascript

Question

Hello Can you help me to filter such Json Object:

{
    "data": {
        "statuses": [{
            "entities": {
                "urls": [],
                "user_mentions": [{
                    "screen_name": "name1"
                }]
            },
            "entities": {
                "urls": [],
                "user_mentions": [{
                    "screen_name": "name2"
                }]
            },
            "entities": {
                "urls": [],
                "user_mentions": [{
                    "screen_name": "name3"
                }]
            }
        }]
    }
}

I need to get array with values of each key screen_name. For example: array = ["name1","name2","name3"] How i can do it without frameworks with only JS?

Thanks for your help. I have updated Json to such like this:

var obj = {
"data": {
    "statuses": [{
        "urls": [],
        "user_mentions": [{
            "indices": [
                3,
                16
            ],
            "id_str": "626444770",
            "id": 626444770,
            "name": "katheryn",
            "screen_name": "sella_sandra"
        }, {
            "indices": [
                "***",
                "***"
            ],
            "id_str": "21447363",
            "id": 21447363,
            "name": "KATY PERRY",
            "screen_name": "katyperry"
        }, {
            "indices": [
                "***",
                "***"
            ],
            "id_str": "21447363",
            "id": 21447363,
            "name": "KATY PERRY",
            "screen_name": "floyd"
        }]
    }]
}

I'm wanna to get array of screen_names.I wrote such code.But when i use for.It doesn't work here:

console.log (statuses[0].user_mentions[i].screen_name) I't silly mistake but I cannot find out how correct that. Help guys!

var statuses = obj.data.statuses;
for (var i=0; i<statuses.length; i++ )

 { if ( typeof statuses[0].user_mentions !== "undefined")
            {    
               for (var i=0; i<statuses.length; i++){
                  console.log (statuses[0].user_mentions[i].screen_name);
            }
        } 

    else console.log ="No senders";
}

statuses still makes no sense. "statuses":[{"entities": {...}, "entities": {...}, "entities": {...}}] — Andreas
– Andreas, Commented Jan 20, 2016 at 19:07
Possible duplicate of How to Extract values from nested json object and concatenate them? — Roy Falk
– Roy Falk, Commented Jan 20, 2016 at 19:23
It was realy not clever.Error was in 'statuses.length'.Thanks everyone for help — frostrock
– frostrock, Commented Jan 26, 2016 at 14:59

gurvinder372 · Accepted Answer · 2016-01-20 18:52:31Z

2

Your syntax is incorrect, since inside statuses array you cannot have another key value data.

Removing the entities key name assuming that it is simply an array of objects then try this

var obj = { "data": {
  "statuses": [
    {
      "urls": [],
      "user_mentions": [{
        "screen_name": "name1"
      }]
    },
    {  
      "urls": [],
      "user_mentions": [{
        "screen_name": "name2"
      }]
    },
    {  
      "urls": [],
      "user_mentions": [{
        "screen_name": "name3"
      }]
    }
  ]
} };

var statuses = obj.data.statuses;
var names = [];
for (var counter = 0; counter < statuses.length; counter++ )
{
   names.push( statuses[ counter ].user_mentions[0].screen_name ); 
}
console.log( names );

edited Jan 20, 2016 at 18:52

answered Jan 20, 2016 at 18:43

gurvinder372

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6 Comments

Mike Cluck Over a year ago

That's not valid syntax.

frostrock Over a year ago

Array "statuses" has a lot of keys not only "entities".I wrote such way to show what i need but array can consist much more keys.

gurvinder372 Over a year ago

@frostrock array cannot have keys, array can only have items. Please check your array by running it on console and correct the same.

Mike Cluck Over a year ago

@gurvinder372 You can't start an object like you did. Run your code in the console and you'll see a syntax error. Also, you can validate JSON easily using this tool.

frostrock Over a year ago

How i can request user_mentions[0]? Because when I use console.log(statuses.user_mentions[0]).I get response :Cannot read property '0' of undefined

|

Daniel Beck · Accepted Answer · 2016-01-26 16:07:55Z

Given your updated data object, this returns an array of screen_names (with any duplicates removed. If you want to keep duplicates, declare names as an array and push to it instead.) I used a relatively verbose coding style to make it easier to see what's going on.

var obj = {
    "data": {
        "statuses": [{
            "urls": [],
            "user_mentions": [{
                "indices": [3,16],
                "id_str": "626444770",
                "id": 626444770,
                "name": "katheryn",
                "screen_name": "sella_sandra"
            }, {
                "indices": ["***","***"],
                "id_str": "21447363",
                "id": 21447363,
                "name": "KATY PERRY",
                "screen_name": "katyperry"
            }, {
                "indices": ["***","***"],
                "id_str": "21447363",
                "id": 21447363,
                "name": "KATY PERRY",
                "screen_name": "floyd"
            }]
        }]
    }
};

var names = {};
for (var i=0; i<obj.data.statuses.length; i++) {
  if (obj.data.statuses[i]["user_mentions"]) {
    var mentions = obj.data.statuses[i]["user_mentions"];
    for (var j=0; j<mentions.length;j++) {
      if (mentions[j]["screen_name"]) {
        names[mentions[j]["screen_name"]] = 1;
      }
    }
  }
}

var arrayOfScreenNames = Object.keys(names);
console.log(arrayOfScreenNames);

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