Parse JSON in JQuery and set in inputs - php

Question

I'm implementing a web and I need to use AJAX+JQuery to complete some fields without recharging the page. I test it and it works correctly but when I tried to use a real JSON (created by MySQL) I'm not be able to parse it.
The format of JSON is this:
[
{
"ID":"5847"
},
{
"Usuari":"admin"
},
{
"Nom":"admin"
},
{
"Cognom1":null
},
{
"Cognom2":null
},
{
"Tipus":"admin"
},
{
"Progres":"0"
}
]
And the AJAX code is this:
$(document).ready(function(){
$("#botoBuscar").click(function(){
$.ajax({url: "http://192.168.1.39/web/api/buscarUser.php?user="+ $("#userInput").val(), success: function(data){
var obj = $.parseJSON(data);
$("#id").val(obj[0]['ID']);
$("#user").val(obj[0]['Usuari']);
$("#nom").val(obj[0]['Nom']);
$("#cognom1").val(obj[0]['Cognom1']);
$("#cognom2").val(obj[0]['Cognom2']);
$("#tipus").val(obj[0]['Tipus']);
$("#progres").val(obj[0]['Progres']);
}});
});
});
If I print only the var "data", it prints correctly the full JSON, but if I try to use data['ID'] or data[0]['ID'], etc.. it doesn't print anything. What I'm doing wrong? Thanks!
If you need, the code to generate JSON is this (PHP):
$sql = "SELECT id, user, nom, cognom1, cognom2, tipus, progres FROM users WHERE user='".$_GET['user']."'";
$result = $db->query($sql);
$row = $result->fetch_array(MYSQLI_ASSOC);
$id = $row['id'];
$user = $row['user'];
$nom = $row['nom'];
$c1 = $row['cognom1'];
$c2 = $row['cognom2'];
$tipus = $row['tipus'];
$progres = $row['progres'];
//build the JSON array for return
$json = array(array('ID' => $id),
array('Usuari' => $user),
array('Nom' => $nom),
array('Cognom1' => $c1),
array('Cognom2' => $c2),
array('Tipus' => $tipus),
array('Progres' => $progres));
echo json_encode($json);
mysqli_close($db);
Thanks!

Answer 1

I found the solution to get the values correctly. The code is the following one:
$(document).ready(function(){
$("#botoBuscar").click(function(){
$.ajax({url: "http://XX.com/api/buscarUser.php?user="+ $("#userInput").val(), success: function(data){
var obj = $.parseJSON(data);
$("#id").val(obj[0]['ID']);
$("#user").val(obj[1]['Usuari']);
$("#nom").val(obj[2]['Nom']);
$("#cognom1").val(obj[3]['Cognom1']);
$("#cognom2").val(obj[4]['Cognom2']);
$("#tipus").val(obj[5]['Tipus']);
$("#progres").val(obj[6]['Progres']);
}});
});
});