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I am trying to print out the key and value names from the data below e.g. "Player 1' - 'ball' 'hat' and "Player 2 - 'ball, 'hat'. So keys have multiple value names but im not sure how i print these out.** I am getting '[object Object]' as a response**. Can someone help me with this understanding please and trying to resolve the matter.

Data

{
    "Player1": {
        "ball": 1,
        "hat": 2

    },
    "Player2": {
        "ball": 1,
        "hat": 2,
    }
}

JavaScript

$.getJSON('data.json', function (data) {
    var response = data;
    for (key in response){
        alert("key: " + key + "value :" + response[key]);
    }
});

Use JSON.stringify(response[key]) when printing the object.

[Solved] [object Object ] error in Sending and Receiving JSON , First of all it alerts [object Object] because the error is an object and the alert Besides, usually an API will return an object (JSON), so you will only be able to Because the browser adds it automatically but javascript won't. JavaScript Object Notation, better known as JSON, is a human-readable text format, commonly used to transfer data across the web. The basic structure of JSON consists of objects , which are sets of string: value pairs surrounded by curly braces:


The simplest way to do this in any modern browser would be to use Object.keys() and just join the result into a string, like this:

for (key in response){
    alert("key: " + key + " value :" + Object.keys(response[key]).join(' '));
}

Result:

key: Player1 value :ball hat key: Player2 value :ball hat

You can test it out here.

[object Object] error, All JavaScript error objects are descendants of the Error object, or an inherited object therein. The SyntaxError object is inherited from the Error object. The JSON Parse error is a specific type of SyntaxError object. The JavaScript exception "cyclic object value" occurs when object references were found in JSON. JSON.stringify () doesn't try to solve them and fails accordingly.


$.getJSON('data.json', function (data) {
    var response = data;
    for (key in response){
        alert("key: " + key + "value :" + JSON.stringify(response[key]));
    }
});

or use response[key].ball, response[key].hat

JavaScript Error Handling, The JSON.stringify() method converts JavaScript objects into strings. When sending data to a web server the data has to be a string. Browser Support. Some common solutions to display JavaScript objects are: Displaying the Object Properties by name; Displaying the Object Properties in a Loop; Displaying the Object using Object.values() Displaying the Object using JSON.stringify()


The stringify function of JSON comes to rescue here. Since most internal functions take data parameters as string or sometimes buffer. Thus you can use the following code:-

    var response = {
    "Player1": {
        "ball": 1,
        "hat": 2

    },
    "Player2": {
        "ball": 1,
        "hat": 2,
    }
}

var dataString = JSON.stringify(response);

Now use dataString for sending and receiving over different calls.

JavaScript JSON stringify() Method, Convert a JavaScript object into a string with JSON.stringify() . Stringify a JavaScript Object. Imagine we have this object in JavaScript: var obj = { name:� Try adding JSON.stringify (result) to convert the JS Object into a JSON string. From your code I can see you are logging the result in error which is called if the AJAX request fails, so I'm not sure how you'd go about accessing the id/name/etc. then (you are checking for success inside the error condition!).


Here's one way of printing the content of the object. Object.keys() method is used to access player's "items" and get those in array format. Updated.

var response = {
    "Player1": {
        "ball": 1,
            "hat": 2

    },
        "Player2": {
        "ball": 1,
            "hat": 2,
    }
};
for (player in response) {

    var items = Object.keys(response[player]);

    var itemText = "";
    for (i = 0; i < items.length; i++) {
        itemText += " '" + items[i] +  "'";
    }

    console.log(player +  " -" + itemText);
    
    //alternative way, suggested by NickCraver
    console.log(player +  " - "+ Object.keys(response[player]).map(function(k) { return '\''+k+'\''; }).join(' ') );
}

JSON.stringify(), Make sure the text is written in JSON format, or else you will get a syntax error. Use the JavaScript object in your page: Example. <p id="demo">� as a sidenote, for (property in obj) will list all properties, even the inherited ones. So you will get a lot of extraneous one cominng for Object.prototype and any 'mother class'. This is unconvenient with json objects. You have to filter them with hasOwnProperty() to get only the properties that this object owns. – BiAiB Feb 8 '11 at 12:55


JSON.parse(), parse() method parses a string and returns a JavaScript object. The string has to be written in JSON format. The JSON.parse() method can optionally transform the � Converting a JSON Text to a JavaScript Object. A common use of JSON is to read data from a web server, and display the data in a web page. For simplicity, this can be demonstrated using a string as input. First, create a JavaScript string containing JSON syntax:


JavaScript JSON parse() Method, The JSON.stringify() method converts a JavaScript object or value to a JSON string, optionally replacing values if a replacer function is specified� The Object class represents one of JavaScript's data types. It is used to store various keyed collections and more complex entities. Objects can be created using the Object() constructor or the object initializer / literal syntax.


JSON.stringify(), The JavaScript exception "cyclic object value" occurs when object references were found in JSON. JSON.stringify() doesn't try to solve them and fails accordingly. Error type. TypeError� JSON.Stringify() and toString()¶ The JSON.stringify() method converts an object or value to a JSON string. JSON.stringify skips some JavaScript-specific objects, such as properties storing undefined, symbolic properties, and function properties. The toString( ) method is called without arguments and should return a string. The string you