json array of objects example

Use a JSON array with objects with javascript

stackoverflow.com › questions › 2799283 › use-a-json-array-with-objects-with-javascript

This isn't a single JSON object. You have an array of JSON objects. You need to loop over array first and then access each object. Maybe the following kickoff example is helpful:

var arrayOfObjects = [{
  "id": 28,
  "Title": "Sweden"
}, {
  "id": 56,
  "Title": "USA"
}, {
  "id": 89,
  "Title": "England"
}];

for (var i = 0; i < arrayOfObjects.length; i++) {
  var object = arrayOfObjects[i];
  for (var property in object) {
    alert('item ' + i + ': ' + property + '=' + object[property]);
  }
  // If property names are known beforehand, you can also just do e.g.
  // alert(object.id + ',' + object.Title);
}

If the array of JSON objects is actually passed in as a plain vanilla string, then you would indeed need eval() here.

var string = '[{"id":28,"Title":"Sweden"}, {"id":56,"Title":"USA"}, {"id":89,"Title":"England"}]';
var arrayOfObjects = eval(string);
// ...

To learn more about JSON, check MDN web docs: Working with JSON .

Answer from BalusC on Stack Overflow

PTC Community

community.ptc.com › t5 › ThingWorx-Developers › Working-with-JSON-and-Arrays › td-p › 836109

Solved: Working with JSON and Arrays - PTC Community

November 9, 2022 - To me "Input" and "localJSON" should be the exact same type, both JSON objects with an array called "PlatformData". But it is only possibly to use .push() on one of the arrays, on the one variable declared in the code.

Stack Overflow

stackoverflow.com › questions › 2799283 › use-a-json-array-with-objects-with-javascript

Use a JSON array with objects with javascript - Stack Overflow

Top answer

1 of 7

74

This isn't a single JSON object. You have an array of JSON objects. You need to loop over array first and then access each object. Maybe the following kickoff example is helpful:

var arrayOfObjects = [{
  "id": 28,
  "Title": "Sweden"
}, {
  "id": 56,
  "Title": "USA"
}, {
  "id": 89,
  "Title": "England"
}];

for (var i = 0; i < arrayOfObjects.length; i++) {
  var object = arrayOfObjects[i];
  for (var property in object) {
    alert('item ' + i + ': ' + property + '=' + object[property]);
  }
  // If property names are known beforehand, you can also just do e.g.
  // alert(object.id + ',' + object.Title);
}

If the array of JSON objects is actually passed in as a plain vanilla string, then you would indeed need eval() here.

var string = '[{"id":28,"Title":"Sweden"}, {"id":56,"Title":"USA"}, {"id":89,"Title":"England"}]';
var arrayOfObjects = eval(string);
// ...

To learn more about JSON, check MDN web docs: Working with JSON .

2 of 7

18

This is your dataArray:

[
   {
      "id":28,
      "Title":"Sweden"
   },
   {
      "id":56,
      "Title":"USA"
   },
   {
      "id":89,
      "Title":"England"
   }
]

Then parseJson can be used:

$(jQuery.parseJSON(JSON.stringify(dataArray))).each(function() {  
    var ID = this.id;
    var TITLE = this.Title;
});

Discussions

Create JSON with Arrays of different types?

Let's go a bit out of order: Does indentation matter in JSON? No. The only things that matter in JSON are the few symbols it uses, it ignores whitespace outside of strings. But also: I don't know how to format it to have every variable listed in the correct spot. Order does not matter in JSON. That's why every property has a name. For the rest of it, here's a quick crash course. You didn't say how you're "making a JSON file". Usually in C# these days, we use a "serialization library". MS has one in I think the System.Text namespace, but before that existed everyone used a package called Newtonsoft.JSON. They both work roughly the same: they convert C# objects to and from JSON. So if I wrote a class like this: public class Example { public int Value { get; set; } } I'd write code (sort of, I'm not double-checking) like this with Newtonsoft: var example = new Example(); example.Value = 10; var json = JsonConvert.SerializeObject(example); The JSON I'd get in return would look like: { "Value": 10 } These libraries support a lot of types by default. We can go backwards from JSON back to C#. Suppose I saw JSON like this: { "examples": [ { "Value": 10 } ] } Think about it by reading from top to bottom. This is: An object with properties: "examples", an array of objects that have these properties: "Value", an integer I see two objects in the definitions, so I need to write two classes: // "an object with an 'examples' property" // Note the name DOES NOT MATTER, because JSON objects do not have type names. public class Examples { // "an array of objects" // Note I can use a capital letter even though the JSON used lowercase, the serializer // is smart enough to handle that. public Example[] Examples { get; set; } } // "an object with a 'Value' property" public class Example { public int Value { get; set; } } The important thing to note is the serializer is smart enough to see that since Examples has an array of Example, it should try to parse the "inner" objects to fit the Example class. My second example intentionally looks a lot like your JSON. You have an object with an "APInvoices" property that is an array of other objects. THOSE objects have many properties, including some like "Images" that are arrays of OTHER objects. To serialize/deserialize your JSON, you're going to need to write 7 or 8 total C# classes. More on reddit.com

r/csharp

7

2

October 13, 2022

api design - Representing a large list of complex objects in JSON - Software Engineering Stack Exchange

As an aside, if you're moving a lot of data, also consider JSONL or paginated results. Pagination can be especially helpful for web clients, as it places natural pauses in the processing, providing a degree of "organic" protection against UI lockups. ... A list of objects is easier to work with. You can use append, map, filter... All the nice things JS Arrays ... More on softwareengineering.stackexchange.com

softwareengineering.stackexchange.com

June 14, 2021

Convert JSON file to Typescript Array of Objects

The interface has an iD field and the json has a date field. They need to be the same types. You also might need to use JSON.parse(stringValue) depending on how you are getting the JSON data.

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