How to POST JSON Data Using Guzzle?

POSTing JSON with Guzzle

Question:

How do I correctly send a POST request with JSON data using Guzzle? The code below results in an internal server error response:

$request = $this->client->post(self::URL_REGISTER, [
    'content-type' => 'application/json',
], [json_encode($_POST)]);

Answer:

Using Guzzle version 5 or later, you can send JSON data in a POST request as follows:

use GuzzleHttp\Client;

$client = new Client();

// Use GuzzleHttp\RequestOptions::JSON
$response = $client->post('url', [
    GuzzleHttp\RequestOptions::JSON => ['foo' => 'bar'],
]);

// or use 'json'
$response = $client->post('url', [
    'json' => ['foo' => 'bar'],
]);

The Guzzle documentation provides more details on JSON request options.

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