Count in Firebase JavaScript

Question

I have a sample JSON object below:

{
  "product" : [ {
    "description" : "This ball has air it.",
    "id" : "product0",
    "name" : "football",
    "price" : 10
  }, {
    "description" : "Can kick upto long distance.",
    "id" : "product1",
    "name" : "soccer boots",
    "price" : 5
  }, {
    "description" : "Long socks",
    "id" : "product2",
    "name" : "stockings",
    "price" : 2
  }, {
    "description" : "This ball has air it.",
    "id" : "product3",
    "name" : "gloves",
    "price" : 3
  }, {
    "description" : "Wear it pls.",
    "id" : "product4",
    "name" : "jersey",
    "price" : 12
  } ]
}

What can be the shortest way to find the number (count) of products in JavaScript? Does Firebase provide any query in JavaScript to find the count in an object?

Firebase has recently released Cloud Functions. Have a look at this [answer](http://stackoverflow.com/a/42713792/5861618) for more details — Rosário Pereira Fernandes, Mar 10 '17 at 08:55

Pugazh · Accepted Answer · 2016-08-02T11:35:03.563

Here is a simple solution. Just get the length of required array from the JSON Object.

var json = {
  "product": [{
    "description": "This ball has air it.",
    "id": "product0",
    "name": "football",
    "price": 10
  }, {
    "description": "Can kick upto long distance.",
    "id": "product1",
    "name": "soccer boots",
    "price": 5
  }, {
    "description": "Long socks",
    "id": "product2",
    "name": "stockings",
    "price": 2
  }, {
    "description": "This ball has air it.",
    "id": "product3",
    "name": "gloves",
    "price": 3
  }, {
    "description": "Wear it pls.",
    "id": "product4",
    "name": "jersey",
    "price": 12
  }]
};

console.log(json.product.length);

Incase of JSON string: Get the length like this

var json = '{  "product" : [ {"description" : "This ball has air it.","id" : "product0","name" : "football","price" : 10  }, {"description" : "Can kick upto long distance.","id" : "product1","name" : "soccer boots","price" : 5  }, {"description" : "Long socks","id" : "product2","name" : "stockings","price" : 2  }, {"description" : "This ball has air it.","id" : "product3","name" : "gloves","price" : 3  }, {"description" : "Wear it pls.","id" : "product4","name" : "jersey","price" : 12  } ]}';

var t = JSON.parse(json);

console.log(t.product.length);

Thank you... This is very simple :) @Pugazh – Pranesh Udumalpet Hanumanth Aug 03 '16 at 07:16 — Pranesh Udumalpet Hanumanth, Aug 03 '16 at 07:16

score 0 · Answer 2 · answered Aug 02 '16 at 11:35

You can save the object on JavaScript variable

var myData = {
  "product" : [ {
    "description" : "This ball has air it.",
    "id" : "product0",
    "name" : "football",
    "price" : 10
  }, {
    "description" : "Can kick upto long distance.",
    "id" : "product1",
    "name" : "soccer boots",
    "price" : 5
  }, {
    "description" : "Long socks",
    "id" : "product2",
    "name" : "stockings",
    "price" : 2
  }, {
    "description" : "This ball has air it.",
    "id" : "product3",
    "name" : "gloves",
    "price" : 3
  }, {
    "description" : "Wear it pls.",
    "id" : "product4",
    "name" : "jersey",
    "price" : 12
  } ]
}

Now you can get length

console.log(myData.product.length);

Count in Firebase JavaScript

2 Answers2