Receiving Data from PHP script to JS

JavaScript
1

I was hoping for some help on how to handle these object in case of errors. I want to ensure each object has data that I can process before I send it to the functions. What I am finding that in the case something is up with object1 execution goes to catch statement even thought I could have doTwo function run normally.

  try {
    const response = await fetch('my_script.php');
    const data = await response.json();
    let object_1 = [JSON.parse(data['first'][0]), JSON.parse(data['first'][1])];
    let object_2 = [JSON.parse(data['second'][0]), JSON.parse(data['second'][1])];
    let object_3 = [JSON.parse(data['third'][0]), JSON.parse(data['third'][1])];
    let object_4 = [JSON.parse(data['forth'][0]), JSON.parse(data['forth'][1])];
    doOne(object_1, object_2);
    doTwo(object_3, object_4);

  }
  catch (error) {
  console.log("catch");
  console.error('This is the error -> :', error)
  }
2

You… shouldnt need to JSON.parse anything here, unless for some reason your json from the server was carrying json strings inside it?

3

yes it is the string

4

So you put JSON data strings… inside your JSON response data?

Why didnt you just… put the data in the response to begin with?

5

This is how I sent it from PHP and this is data from 4 different API calls.

$result = array(
  'first'  => array ($response1[0],$response1[1]),
  'second' => array ($response2[0],$response2[1]),
  'third'  => array ($response3[0],$response3[1]),
  'forth'  => array ($response4[0],$response4[1])
);
echo json_encode($result);
6

So $response1[0] is a JSON string, and $response1[1] is a JSON string, etc.?

Okay… i’m… not sure if json_encode is going to process that cleanly… what’s it look like when your server sends it out?

7

yes and $response1[1] is http code which i can use for error checking. everything works as it should and I am mostly curious about how to handle the part of the code that I shared above. I was hoping to still be able to do something with other objects in case one has error

8

Wait… if response1[1] is an HTTP code, not a JSON string, and you try to JSON.parse it, it will throw an error. This is why i specifically asked you if all of those are JSON strings…are they?

9

it is a number as string. is it not?

  $response = curl_exec($ch);
  $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

  // Check for errors
  if ($httpCode >= 400) {
      // Handle error, for example, log it or throw an exception
      return array (false, $httpCode);
  }

  // Close cURL session
  curl_close($ch);
 
  //return data from the API call as a string
  return array ($response, $httpCode);
10

No, a JSON string defines an object. "{\"thisis\":\"an object\"}" is a JSON string. "400" is not a JSON string.

11

Ok make sense. Thank you

12

ok have to go get little refresher…
java script calls php script which makes 4 api calls

api calls returns the string and http code as an integer
I put those two into an array and each of these 4 arrays are put into associative array in PHP and send it out via echo statement echo json_encode()

Does that make sense?