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How to read the values inside the json array

I have a json like
var obj={
"address":{
"addlin1":"",
"addlin2":""
},
"name":"sam",
"score":[{"maths":"ten",
"science":"two",
"pass":false
}]
}
Now when Iam trying to modify the json iam try an array variable and passing above json to that like
var data=JSON.parse(obj);
var json={};
json['name']=data['name'];
json['address']={};
json['address']['addressline1']=data['address']['addlin1'];
json['address']['addressline2']=data['address']['addlin2'];
json['marks']={};
json['maths']=data['score']['maths'];
For name and address I was able to form the json as i was expecting.But for marks I was unable.May be in obj json score values are in [ ]
So,when i console the json it is in this way
"name":"sam",
"address":{
"addresslin1":"",
"addresslin2":""
},
"score":{}
}
So how can I also read the values inside [] array.
Can someone help me
Thanks

json['maths']=data['score'][0]['maths'];
if you're not sure that data['score'] has any elements you can check prior to reading maths key:
if (data['score'].length) {
json['maths']=data['score'][0]['maths'];
}

data['score'] is an array, so you can't read it like that
json['maths']=data['score']['maths'];
you have to read it like that:
json['maths'] = data['score'][0].maths;
Also, obj is not a JSON, but a JavaScript object. You can use it directly.
json['maths'] = obj['score'][0].maths;
A JSON is a string, like that:
JSON.stringify(obj)
var json = "{"address":{"addlin1":"","addlin2":""},"name":"sam","score":[{"maths":"ten","science":"two","pass":false}]}";

create another json2 to contain score data then assign to json.
for example :
var json={};
json2 = {}
json2[0] = 1;
json2[1] = 2;
json[0] = json2;

Extract Lat/Long data from the javascript array

I want to extract Lat/Long values from the below mentioned array. Please help me.
var products = {"PolygonCords":"[[51.65040675460229,0.034332275390625],[51.613752957501,0.028839111328125],[51.61034179610213,0.1812744140625],[51.642737480428536,0.157928466796875]]"};

Parse the json string using JSON.parse() and iterate over array using forEach
var products = {
"PolygonCords": "[[51.65040675460229,0.034332275390625],[51.613752957501,0.028839111328125],[51.61034179610213,0.1812744140625],[51.642737480428536,0.157928466796875]]"
};
JSON.parse(products.PolygonCords).forEach(function(v) {
console.log(v[0], v[1])
})

Javascript: How to parse a json array without knowing the key name?

I want to parse the following json:
{"key_410441":{"hashId":"hash123","tube_id":"4accdefk31"}}
Where key_410441 is the entry's name representing the object's value, and the following array is the object's data.
How can I retrieve it's value?
function defined(json) {
for (var i in json) {
var objId = json[i]. ????
}
}

Like Robo Robok said, use Object.keys(object)
if your json look like {"key_410441":{"hashId":"hash123","tube_id":"4accdefk31"}}
function defined(json) {
var hashId = json[Object.keys(json)[0]].hashId
var tube_id = json[Object.keys(json)[0]].tube_id
}
}
you can use shortcut json[Object.keys(json)] because you have olny one object
key_410441

Object keys are returned in form of an array by Object.keys(object)

I suppose you are using jquery and ajax to get a json from an external file. Then the piece of code would be:-
$.getJSON("aa.json", function(data) {
var obj = Object.keys(data),
json = data[obj];
for(var s in json) {
console.log(json[s]);
}
});

How to get array elements from json using javascript

I am trying to extract an array from my json string. Please help me. I have the following javascript code,
function lookup(inputString,autoSuggestionsList,TextFieldName)
{
autoSuggestionsListMain=autoSuggestionsList;
inputTextField=TextFieldName;
if(inputString.length == 0)
{
$('#suggestions').hide();
}
else
{
$.post("show_location_hint.php",
{ queryString: ""+inputString+"" },
function(data) { if(data.length >0) { } });
}
}
my show_location_hint.php file will echo the following json string
{"root": {"success":"1","message":"","data":{"locations":[a,b,c]}}}
how can I get the elements from the array locations?
please help me
Thanks

You can parse it to an array using JSON.parse():
var dataArray = JSON.parse(jsonString)
Then just simply do stuff like:
alert(dataArray.root.message)

Try this:
$.post("show_location_hint.php", { queryString: inputString }, function(data) {
if (data) {
var locations = data.root.data.locations;
}
});
Note however that your JSON format is not valid as, a, b, and c should be wrapped in double quotes. I'm guessing this is just a sample of your actual data though.

First your json is well formed. It should be:
{"root": {"success":"1","message":"","data":{"locations":["a","b","c"]}}}
and you can get data like this using jQuery:
var data = {"root": {"success":"1","message":"","data":{"locations":["a","b","c"]}}};
console.log(data.root);
console.log(data.root.success);
console.log(data.root.data);
$.each(data.root.data,function(index,item){
console.log(item);
});
Fiddle DEMO

Get json data from a file

I wan't to get data from a json file without knowing exacly where the data is:
I have this json
var names= [
{
"category":"category1" ,
"name1":"david",
"name2":"jhon",
"name3":"peter"
},
{
"category":"category2" ,
"name1":"Smith" ,
"name2":"Anna",
}
]
suppose i have a string variable:
var str='category2';
how can i get category2.name1 using the variable?
I don't want to use names[1].name1 because i don't know whats in str and i want to avoid using for loop.

There are some build-in functions that may help you. For example:
var matchingElements = names.filter(function(object, index, array) {
return object.category == str;
});
What you're looking for will always be in matchingElements[0].name1 if matchingElements.length > 0.