Get Count of True Values in Json With JavaScript

Get count of true values in JSON with javascript

Use reduce to iterate over the values of each object, extract the active property from each, and add that boolean to the accumulator, which will coerce it to a number:

const obj = {  filters: {    module: {      value: "All",      active: false    },    dates: {      value: [],      active: true    },    foo: {      value: "All",      active: false    },    bar: {      value: [],      active: true    }  }};
console.log(  Object.values(obj.filters).reduce((a, { active }) => a + active, 0));

How to count values in JSON object?

You can do it like this if all you want is to count them.

 var count = 0;
for (var key in obj.row) {
  if (key.dimension) {
   count++;
  }
}
console.log(count);

Javascript: Get count of values in JSON

First of all, convert your JSON array to an array object:

var json_ar = '[100, 100, 101, 100, 101, 101, 101, 101]';
var ar = JSON.parse(json_ar);

From then on, it's simply counting, which depends a little bit on what the objects in your array actually are. If they're numbers, a simplistic

var counts = {};
ar.forEach(function(v) {
    counts[v] = counts[v] ? counts[v] + 1 : 1;
});

will get you counts = {'100': 3, '101': 5}.

Count number of elements with certain properties inside JSON

You can use the filter function to filter an array of objects :

var data = {...}

data.humans.filter(function(o) { return o.hairs == 2 }).length
//Return the number of humans who have 2 hairs

Take a look fiddle

Count number of values in json Angular 5

You can use filter() to get the array and then use length:

The filter() method creates a new array with all elements that pass
the test implemented by the provided function.

var obj = {  "tasks": [    {      "name": "Moj Zadatak",      "finished": true,      "id": 1    },    {      "name": "Moj Zadatak",      "finished": true,      "id": 2    },    {      "name": "Novo",      "finished": true,      "id": 3    },    {      "name": "Prepravka",      "finished": true,      "id": 4    },    {      "name": "Prepravka",      "finished": true,      "id": 5    },    {      "name": "Najnovije",      "finished": false,      "id": 6    },    {      "name": "Hajde",      "finished": false,      "id": 7    },    {      "name": "Hajde",      "finished": false,      "id": 8    },    {      "name": "Novi Task",      "finished": false,      "id": 9    }  ]}

let finishedValues = obj.tasks.filter(n => n.finished).length;let unfinishedValues = obj.tasks.filter(n => !n.finished).length;
console.log(finishedValues);console.log(unfinishedValues);

Count the number of items in json with conditions

Well, you can do this without any 3rd party library and also without looping:

array.filter(function(value) { return value.age === 23 }).length;

And with ES6 it even becomes more terse

array.filter(value => value.age === 23).length;

Counting instances of key value pairs in JSON file in JavaScript

You can use a key/value hash of type names/counts, and then iterate over your collection of objects, incrementing each count as you go. For example:

var counts = {};
var objects = [/*array of your objects*/];

objects.forEach(function (o) {
    // add the type to the hash if it is missing;
    // set initial count to 0
    if (!counts.hasOwnProperty(o.type)) {
        counts[o.type] = 0;
    }
    // increment the count based on the type
    counts[o.type] += 1;
});

console.log(counts);

Get Count of True Values in Json With JavaScript