How can I get the key value in a JSON object?

How do I get the key value in a JSON object and the length of the object using JavaScript?

For example:

[
  {
    "amount": " 12185",
    "job": "GAPA",
    "month": "JANUARY",
    "year": "2010"
  },
  {
    "amount": "147421",
    "job": "GAPA",
    "month": "MAY",
    "year": "2010"
  },
  {
    "amount": "2347",
    "job": "GAPA",
    "month": "AUGUST",
    "year": "2010"
  }
]

Here, length of this array is 3. For getting, value is fine ([0].amount), in index[0] it has three name value pairs.

So, I need to get the name (like amount or job... totally four name) and also how do I count how many names there are?

First off, you're not dealing with a "JSON object." You're dealing with a JavaScript object. JSON is a textual notation, but if your example code works ([0].amount), you've already deserialized that notation into a JavaScript object graph. (What you've quoted isn't valid JSON at all; in JSON, the keys must be in double quotes. What you've quoted is a JavaScript object literal, which is a superset of JSON.)

Here, length of this array is 2.

No, it's 3.

So, i need to get the name (like amount or job... totally four name) and also to count how many names are there?

If you're using an environment that has full ECMAScript5 support, you can use Object.keys (spec | MDN) to get the enumerable keys for one of the objects as an array. If not (or if you just want to loop through them rather than getting an array of them), you can use for..in:

var entry;
var name;
entry = array[0];
for (name in entry) {
    // here, `name` will be "amount", "job", "month", then "year" (in no defined order)
}

Full working example:

(function() {
  
  var array = [
    {
      amount: 12185,
      job: "GAPA",
      month: "JANUARY",
      year: "2010"
    },
    {
      amount: 147421,
      job: "GAPA",
      month: "MAY",
      year: "2010"
    },
    {
      amount: 2347,
      job: "GAPA",
      month: "AUGUST",
      year: "2010"
    }
  ];
  
  var entry;
  var name;
  var count;
  
  entry = array[0];
  
  display("Keys for entry 0:");
  count = 0;
  for (name in entry) {
    display(name);
    ++count;
  }
  display("Total enumerable keys: " + count);

  // === Basic utility functions
  
  function display(msg) {
    var p = document.createElement('p');
    p.innerHTML = msg;
    document.body.appendChild(p);
  }
  
})();

How can I get the key value in a JSON object?, you can use below codes: const keys = Object. keys(jsonObject); const values = Object. values(jsonObject); I'm not looking for the keys that this object contains but the key of the object itself (the key in the array containing the object). I have this JSON: { "Object name (text)": {

JSON content is basically represented as an associative array in JavaScript. You just need to loop over them to either read the key or the value:

    var JSON_Obj = { "one":1, "two":2, "three":3, "four":4, "five":5 };

    // Read key
    for (var key in JSON_Obj) {
       console.log(key);
       console.log(JSON_Obj[key]);
   }

How to get Key and Value from JSON object in Javascript(Postman , var score = object. get("score"); // score=987 var mode = object. get("mode"); // mode="easy" var premiumUser = object. // Get GeoPoints from the "location1" and "location2" keys. var objLoc1 = object. getGeoPoint("location1"); var objLoc2 = object. // Get a value of a JSON object. var jsonObject = object. Use Object.entries (obj) to get an array of key/value pairs from obj. Use array methods on that array, e.g. map. Use Object.fromEntries (array) on the resulting array to turn it back into an object. For example, we have an object with prices, and would like to double them:

You may need:

Object.keys(JSON[0]);

To get something like:

[ 'amount', 'job', 'month', 'year' ]

Note: Your JSON is invalid.

Getting a Key-value Pair, The value of the key at the first level of the JSON document hierarchy will be obtained. getString("mode"); // mode="easy" boolean premiumUser = object. Oh its very easy. As told its an associate array i.e dictionary. You will do the same thing that you do when you want to get the value from dictionary that is var value = JsonObj[key] – Anand Nov 5 '14 at 11:13

Try out this

var str ="{ "name" : "user"}";
var jsonData = JSON.parse(str);     
console.log(jsonData.name)

//Array Object

str ="[{ "name" : "user"},{ "name" : "user2"}]";
jsonData = JSON.parse(str);     
console.log(jsonData[0].name)

JavaScript JSON Parsing, In JSON, property names or keys are always strings, while the value can be a string , number , true or false , null or even an object or an array . Strings must be � JSON objects are surrounded by curly braces {}. JSON objects are written in key/value pairs. Keys must be strings, and values must be a valid JSON data type (string, number, object, array, boolean or null). Keys and values are separated by a colon. Each key/value pair is separated by a comma.

When you parse the JSON representation, it'll become a JavaScript array of objects.

Because of this, you can use the .length property of the JavaScript array to see how many elements are contained, and use a for loop to enumerate it.

JSON Object, JSON objects are written in key/value pairs. JSON objects are surrounded by curly braces { } . Keys must be strings, and values must be a valid JSON data type � The Map object is a simple key/value map. Object: Default values for url parameters. nil keys and values are ok. on What you need is it in form of a json object. ) JSON is a set of key value pairs. 1 Installation. Each object contains 2 lots of data (name/value pair) also separated with a comma. Properties properties) // convert java.

org.json.JSONObject.keys java code examples, next(); // get the value of the dynamic key JSONObject currentDynamicValue = questionMark.getJSONObject(currentDynamicKey); // do something here with the � \$\begingroup\$ @user1613163 In JS, we can use objects, like your JSON, as associative arrays, so we don't need to search the keys. We can just index in using the property name. So if selUser is "User02", myObj[selUser] will pull up the data for user 02. \$\endgroup\$ – cbojar Aug 25 '14 at 22:06 |

Read values from json object using keys, Hi, I have a requirement where in i need to parse a json object without knowing the keys i get in the payload. I found a way to get the keys using new JSON(). I would like to obtain the list of keys only as a simple array.(Parsing the first object in the array is enough to get this as all other objects have the same keys) In case of the above output, I would like the simple array to look as ["date","value","volume"]

An Introduction to JSON, These objects and arrays will be passed as values assigned to keys, and typically will be comprised of key-value pairs as well. Nested Objects. In� JSON Values. In JSON, values must be one of the following data types: a string; a number; an object (JSON object) an array; a boolean; null; In JavaScript values can be all of the above, plus any other valid JavaScript expression, including: a function; a date; undefined; In JSON, string values must be written with double quotes:

Comments
  • That’s not valid JSON as the keys aren’t quoted.
  • see this question stackoverflow.com/questions/558981/…
  • thanks for all, given your answers.
  • use jQuery and getJSON method.
  • It's also advisable to check that the property isn't coming from the prototype. Inside the for loop use if (entry.hasOwnProperty(name)) {... do stuff...}
  • @Darren: Yeah, I just added a note about that although in this case it's completely unnecessary unless someone is mucking about with Object.prototype, which they really shouldn't be.
  • how to find the length of "JsonObj"?
  • What if i wanna get Value into For loop ?*
  • Oh its very easy. As told its an associate array i.e dictionary. You will do the same thing that you do when you want to get the value from dictionary that is var value = JsonObj[key]
  • I am getting TypeError: Object.keys is not a function