Retrieve JSON POST data in CodeIgniter

I had the exact same problem. CodeIgniter doesn't know how to fetch JSON. I first thought is about the encoding Because I use fetch.js and not jQuery. Whatever I was doing I was getting an notting. $_POST was empty as well as $this->input->post(). Here is how I've solved the problem.

Send request (as object prop -- because your js lib might vary):

method: 'POST',headers: {  'Accept': 'application/json',  'Content-Type': 'application/json'},body: JSON.stringify({  ready: 'ready'})

Node: I encode my data of type object into json. jQuery does this by itself when you set the dataType: 'JSON' option.

CodeIgniter (3.1 in my case):

$stream_clean = $this->security->xss_clean($this->input->raw_input_stream);$request = json_decode($stream_clean);$ready = $request->ready;

Note: You need to clean your $this->input->raw_input_stream. You are not using $this->input->post() which means this is not done automatically by CodeIgniter.

As for the response:

$response = json_encode($request);header('Content-Type: application/json');echo $response;

Alternatively you can do:

echo $stream_clean;

Note: It is not required to set the header('Content-Type: application/json') but I think it is a good practice to do so. The request already set the 'Accept': 'application/json' header.

So, the trick here is to use $this->input->raw_input_stream and decode your data by yourself.

I had the same problem but I found the solution.

This is the Json that I am sending [{"name":"JOSE ANGEL", "lastname":"Ramirez"}]

$data = json_decode(file_get_contents('php://input'), true);echo json_encode($data);

This code was tested and the result is [{"name":"JOSE ANGEL","lastname":"Ramirez"}]

Although OP seems satisfied, choosen answer doesn't tell us the reason and the real solution . (btw that post_array is not an array it's an object indeed ) @jimasun's answer has the right approach. I will just make things clear and add a solution beyond CI.

So the reason of problem is ;

Not CI or PHP, but your server doesn't know how to handle a request which has an application/json content-type. So you will have no $_POST data. Php has nothing to do with this. Read more at : Reading JSON POST using PHP

And the solution is ;Either don't send request as application/json or process request body to get post data.

For CI @jimasun's answer is precise way of that.

And you can also get request body using pure PHP like this.

$json_request_body = file_get_contents('php://input');