Parse json array using javascript

Question

I have a json arry

 var students = {"apResults":[{"offid":"267","item_name":"","offer_name":"fsdfsf","stlongitude":"77.5945627","stlatitude":"12.9715987"},
{"offid":"265","item_name":"","offer_name":"vess offer shops","stlongitude":"","stlatitude":""},
{"offid":"264","item_name":"","offer_name":"vess ofer shop","stlongitude":"","stlatitude":""},
{"offid":"263","item_name":"","offer_name":"ofer frm vess","stlongitude":"77.5943760","stlatitude":"12.9716060"},
{"offid":"262","item_name":"","offer_name":"offer hungamma","stlongitude":"77.5943760","stlatitude":"12.9716060"},
{"offid":"261","item_name":"","offer_name":"offer hungamma","stlongitude":"77.5943760","stlatitude":"12.9716060"},
{"offid":"260","item_name":"","offer_name":"offer1","stlongitude":"77.5943760","stlatitude":"12.9716060"},
{"offid":"259","item_name":"","offer_name":"offer","stlongitude":"77.5943760","stlatitude":"12.9716060"}]}

How i can parse this json arry using json.parse. I have tried this code

 for(i=0;i<students.apResults.length;i++)
{
 var contact = JSON.parse(students.apResults);
 var offid = contact.offid;
 alert(offid) 
}

But its giving an error JSON.parse: unexpected character.Edited my question

• danwellman: What's the error? Which browser?
• Nemoy: What is the use of parsing it. it is already a javascript object use students.Maths[i].Name to access name of each student
• SkonJeet: @danwellman - I think you're after quick upvotes here for requesting more information when in fact more information was not required had you have just read the post. Despite the fact it's considered good practice to also provide more details of the error (and often crucial) I don't think it was here.
• danwellman: @Skonjeet I was asking for more info simple because saying 'I have an error' and then not stating what the error is is like walking into a shop and saying 'I want something' and then stading still and waiting. I am not looking for quick upvotes. Do you even get rep from comment upvotes?
• danwellman: @SkonJeet. I deleted the comment that you upvoted, not because I don't stand by what I said but because I do not need or want any form of rep from you.

Answer 1

That's not a json string, that's a regular javascript variable:

for(i=0;i<students.Maths.length;i++)
{
 var contact = students.Maths[i];
 var fullname = contact.Name;
 alert(fullname) 
}

• Shinu Thomas: if i remove Maths and Science is it a json string?
• ZER0: It's still an object. Here the JSON string representation: alert(JSON.stringify(students))
• SkonJeet: @THOmas - you need to read more on JSON mate. Think of typical JSON as a big string that can then be interpreted (parsed) by javascript into an actual javascript object. What you have is already the object, you'd be taking a huge step back if you were to want to deal with JSON from an object you already have in order to parse it back as an object.

Answer 2

for(i=0;i<students.apResults.length;i++)
{
 var contact = JSON.parse(students.apResults[i].offid);
 alert(contact) 
}

Answer 3

JSON parses strings, not objects/arrays.

why need parsing when you can access it like students.Maths[i].Name

Answer 4

students is not a JSON array, it's an actual array. You don't have to parse because it's not a string. So you can access directly to the data you need:

for(i=0;i<students.Maths.length;i++) {
 var contact = students.Maths[i];
 var fullname = contact.Name;
 alert(fullname) 
}

Answer 5

You can't parse students because is not a JSON. It's simple object.

However this will work:

var students = JSON.stringify(students); // if you want to send data
students = JSON.parse(students); // after receiving make a object from it
//use like any object 
for(i=0;i<students.Maths.length;i++)
{
 var contact = students.Maths[i];
 var fullname = contact.Name;
 alert(fullname) 
}

Of course it doesn't make sense to write it that way unless you send students data to other site or program.

Edit: You don't need JSON in this code at all. But if you want to test JSON.parse() do it this way:

var students = { ... } // your data
var students = JSON.stringify(students); // students is `object`, make it `string`
students = JSON.parse(students); // now you can parse it, `students` is object again 
for(i=0;i<students.apResults.length;i++) {
 var contact = students.apResults; // no JSON
 var offid = contact.offid;
 alert(offid) 
}

That should work.

Answer 6

What you have is a javascript object. So, you won't need the JSON.parse

for(i=0;i<students.Maths.length;i++)
{
 var contact = students.Maths[i]);
 var fullname = contact.Name;
 alert(fullname) 
}

this should be ok

Answer 7

The idea of JSON is for the exchange of objects represented as a structured string (in a nutshell). What you've got there is simply an object. It's unnecessary (and impossible) to parse and object that isn't JSON into a javascript object; what you have is the outcome of what you would expect from a parsed JSON string.