Trying to extract information throught a PHP file Undefined - php

Question

I'm trying to extract the information with a XHR request (AJAX) to a php file (this php file gets the information throught json file with Get request too) so when I try to do console.log(Checker) on the console, it returns Undefined and if I put alert(Checker) it returns [object Object]. How can I solve it?
PHP:
<?php
headers('Content-Type', 'application/json')
$jsonContents = file_get_contents('../data/data.json');
echo $jsonContents
?>
JS:
function start() {
$.ajax({
type: 'GET',
url: 'api/domain/showall.php',
dataType: 'json',
success: function(data) {
alert(data)
displayTheData(data)
}
});
}
function displayTheData(data) {
Checker = data;
JSON.stringify(Checker)
console.log(Checker)
window.Checker = Checker;
}
JSON:
[{"name":"Google","url":"google.es","id":1}]

Answer 1

Here you are strigify data but not store value i any var.
function displayTheData(data) {
Checker = data;
var displayChecker = JSON.stringify(Checker) /// add displayChecker
console.log(displayChecker ) // print it
window.Checker = Checker;
}
There is not displayTheData() function so first call it and pass response params.

Answer 2

You need to echo the JSON Response ! Change return $jsonContents; to echo $jsonContents; it will work !!!

Answer 3

You must parse data into body (not returning it which has no meaning outside a function) and, optionnaly but much better, fill some headers. A very minimalistic approach could be :
<?php
headers('Content-Type', 'application/json');
$jsonContents = file_get_contents('../data/data.json');
echo $jsonContents // echo JSON string
?>