how to delete the element in json Array

You can use splice function of Array

var data = [
{
    "sno": 1,
    "brandName": "EPIDOSIN 8 MG INJECTION",
    "price": "Rs. 17",
    "packagingOfProduct": "1 vial(s) (1 ML injection each)",
    },
{
    "sno": 2,
    "brandName": "ALTACEF 1.5 GM INJECTION",
    "price": "Rs. 327",
    "packagingOfProduct": "1 vial(s) (1 injection each)",

}]

data.splice(1, 1);

where first argument is index and second argument is number of element need to remove

Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

Update: If you want to delete particular attribute of object, here is example to delete brandName from each object inside array

data.forEach( obj => delete obj.brandName);

let tab = [ {
    "sno": 1,
    "brandName": "EPIDOSIN 8 MG INJECTION",
    "price": "Rs. 17",
    "packagingOfProduct": "1 vial(s) (1 ML injection each)",
    }, {
    "sno": 2,
    "brandName": "ALTACEF 1.5 GM INJECTION",
    "price": "Rs. 327",
    "packagingOfProduct": "1 vial(s) (1 injection each)",

}]

to remove the second element try using :

tab.pop(tab[1])

or

delete(tab[1])

You can use lodash.js for nodejs.

var _ = require('lodash');
var data = [
{
        "sno": 1,
            "brandName": "EPIDOSIN 8 MG INJECTION",
                "price": "Rs. 17",
                    "packagingOfProduct": "1 vial(s) (1 ML injection each)",
                        },
{
        "sno": 2,
            "brandName": "ALTACEF 1.5 GM INJECTION",
                "price": "Rs. 327",
                    "packagingOfProduct": "1 vial(s) (1 injection each)",

}];
_.remove(data, {
        sno: 2
});
console.log(data);

Please refer below link for more details

How can I remove an element from a list, with lodash?