In Jquery, How to check empty and duplicate value in Json object?

Question

var data = {
  "obj":[{
    "name": "John",
    "age": "10",
    "Alias": "Person",
    "where":[{"City1":"foo", "City2":"foo2"}]
  },{
    "name": "Mike",
    "age": "",
    "Alias": "Person",
    "where":[{"City1":"test1", "City2":"test2"}]
  }]
}

data.obj[0].Alias and data.obj[1].Alias is duplicate.

Also data.obj[1].age is empty.

if empty or duplicate value exists in JSON object, return false.

How can i check empty and duplicate value?

stackoverflow.com/questions/30735465/… - this post may gonna help you :) — Canet Robern
– Canet Robern, Commented Sep 14, 2017 at 1:36

Anik Islam Abhi · Accepted Answer · 2017-09-14 01:59:44Z

1

you can use filter

It will first check for empty age.
If any empty age, it will send false alert. If it sends false alert, that item will not be in the final.
Else it will try to check for duplicate Alias. If any item exists in the temp list that's mean it's already passed once. it will return false.
If no item exists in the temp list, it will push that item in the temp and return true.
if the total item in the final is not same equal to the data that's mean there is a invalid item in the in the json.

Like this

var data = {
  "obj": [{
    "name": "John",
    "age": "10",
    "Alias": "Person",
    "where": [{
      "City1": "foo",
      "City2": "foo2"
    }]
  }, {
    "name": "Mike",
    "age": "",
    "Alias": "Person",
    "where": [{
      "City1": "test1",
      "City2": "test2"
    }]
  }]
}

var temp = []
var final = data.obj.filter((x, y) => {
  console.log(x)
  if (x.age.length == 0) {
    return false
  } else {
    if (temp.indexOf(x.Alias) > -1){
      return false
    }
    else {
       temp.push(x.Alias)
       return true
    }
  }
})

console.log(final.length == data.obj.length ? "Valid" : "Not valid JSON")

DEMO

edited Sep 14, 2017 at 1:59

answered Sep 14, 2017 at 1:39

Anik Islam Abhi

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1 Comment

Yunhee Over a year ago

i update data.obj[1].age : "11" and data.obj[1].Alias : "Person2". But it still return "not valid Json"...

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