Json提取和使用数据（node.js）

Question

How can I access this data?

Here is my Json:

 {
  "6a768d67-82fb-4dd9-9433-d83dbd2f1b78": {
    "name": "Bahut",
    "11": {
      "timestamp": 1380044486000,
      "value": "false"
    }
  },
  "4f4a65e4-c41b-4038-8f62-76fe69fedf60": {
    "name": "Vit",
    "11": {
      "timestamp": 1380109392000,
      "value": "false"
    }
  },
  "a12d22cc-240e-44d6-bc58-fe17dbb2711c": {
    "name": "Cuis",
    "11": {
      "timestamp": 1379883923000,
      "value": "false"
    }
  }
}

I'm trying to read and extract for each entries the id (xxxxxxxx-xxxx-...-xxxxxxxxx) and the "name" to put then in an array.

But I didn't manage to do.

trying :

var nameid = json.'XXXXX-....-XXXX'.name;

or replace '-' by ''

var nameid = json.XXXXXXXXX.name;

didn't work too.

Answer 1

You need to use array-style access to get the subobject associated with the id key:

var nameid = json["a12d22cc-240e-44d6-bc58-fe17dbb2711c"].name; // or ["name"]
// nameid => "Cuis"

This is because hyphens are not a valid character for dot-style access (can't use them in variable names in JavaScript).

In order to extract all of the you will need to loop through the object, and add them to an array, like so:

var arr = [];
for (var id in json) {
    arr.push(json[id]["name"]);
}

Which will give you an array of all the names in that JSON object.

Answer 2

If you want to loop through the data, use a for in loop:

for (var key in obj) { //obj is your data variable
    console.log(key); //xxxx-x-xx-x-x-xxxx
    console.log(obj[key].name); //the name for each
}

Answer 3

You could use Object.keys to get an array of properties.

var js = JSON.parse(json);
var props = Object.keys(js);

var result = props.map(function(prop) {
  return {
    id: prop,
    name: js[prop].name;
  };
});

The final result is an array of objects with 2 properties: id , name

Answer 4

Access the JSON like you would an array, eg:

data["a12d22cc-240e-44d6-bc58-fe17dbb2711c"].name

jsfiddle

Answer 5

not a common way of looping, but in this case you could loop over the json object

for (var prop in json){
     print("prop",json[prop].name);
}