Get specific value from json

Question

I have this json. I only care about the uniqueIDs.

How can I get ONLY the uniqueID values delivered back to me as a comma separated list, ie, 11111, 22222? (I need to create my own array.) I can't edit the json below - I am just trying to parse the value I care about out of it....

{
        products: [{
            type: "Unique",
            name: "Joe",
            description: "Joes Description",
            uniqueID: "11111"
        }, {
            type: "Unique",
            name: "Jane",
            description: "Janes Description",
            uniqueID: "22222"
        }]
}

Thought it would be this easy but its not...

$data['uniqueID'][0]

If I'm not wrong, this is a JSON file and you've included this from the HTML file, yes? — Awol, Aug 13 '16 at 16:31
Check [this fiddle](https://jsfiddle.net/py21wco2/10/). The json is printed in console, as it would be returned from the server, using `JSON.stringify`, that converts a JavaScript value ( the object in my case for creating a `JSON`) to a `JSON string`. — Stefan.B, Aug 13 '16 at 17:09
Updated [fiddle](https://jsfiddle.net/py21wco2/14/), not really a big difference. — Stefan.B, Aug 13 '16 at 17:41

Arun Ghosh · Answer 1 · 2016-08-13T16:29:50.333

0

Use map function:

var foo = {
  metadata: {
    products: [{
      type: "Unique",
      name: "Joe",
      description: "Joes Description",
      uniqueID: "11111"
    } {
      type: "Unique",
      name: "Jane",
      description: "Janes Description",
      uniqueID: "22222"
    }]
  }
}
var ids = foo.metadata.products.map(x => x.uniqueID);

And if you are not familiar with arrow function:

var ids = foo.metadata.products.map(function(x){
    return x.uniqueID;
});

edited Aug 13 '16 at 16:29

answered Aug 13 '16 at 16:20

Arun Ghosh

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says metadata not defined :( – user3390251 Aug 13 '16 at 16:25
What is your main variable name? Can you put the full code? – Arun Ghosh Aug 13 '16 at 16:27
There is no variable... the file I am referencing is only the json and begins with { metadata.... – user3390251 Aug 13 '16 at 16:33

score 0 · Answer 2 · edited Jun 20 '20 at 09:12

The Underscore Way

You can use underscore js _.pluck() or _.map() function.

var data = {
  metadata: {
    products: [{
      type: "Unique",
      name: "Joe",
      description: "Joes Description",
      uniqueID: "11111"
    },
    {
      type: "Unique",
      name: "Jane",
      description: "Janes Description",
      uniqueID: "22222"
    }]
  }
};


//Use plunk method
var uniqueIDArr = _.pluck(data.metadata.products, 'uniqueID'); 

console.log(uniqueIDArr);
//=> ["11111", "22222"]

//Use map function
var uniqueIDArr = _.map(data.metadata.products, function(obj) {
  return obj.uniqueID;
}); 
console.log(uniqueIDArr);
//=> ["11111", "22222"]

<script src="https://cdn.jsdelivr.net/underscorejs/1.8.3/underscore-min.js"></script>

Yosvel Quintero · Answer 3 · 2016-08-13T17:25:10.787

You can use Array.prototype.map() to create a new array and chain a Array.prototype.join() to get the uniqueIDsString in a single line:

var obj = {metadata: {products: [{type: "Unique",name: "Joe",description: "Joes Description",uniqueID: "11111"}, {type: "Unique",name: "Jane",description: "Janes Description",uniqueID: "22222"}]}},
    uniqueIDsString = obj
        .metadata
        .products
        .map(function(product) {
            return product.uniqueID;
        })
        .join(', ');

console.log(uniqueIDsString);

Get specific value from json

3 Answers3

The Underscore Way