Use json objects. Do something like that. Don't write json by hand, you could easily do a mistake.

public JSON() throws JSONException
{
    JSONArray locArr=new JSONArray();
    locArr.put(createLatLng(40.900799, 8.606102));
    locArr.put(createLatLng(42.900799, 9.606102));
    JSONObject main=new JSONObject();
    main.put("locations", locArr);
    Log.d("JSON",main.toString());      
}


public JSONObject createLatLng(double lat, double lng) throws JSONException
{
    JSONObject latLng=new JSONObject();
    latLng.put("lat",lat);
    latLng.put("lon",lng);
    JSONObject latLngWrap=new JSONObject();
    latLngWrap.put("latLng",latLng);
    return latLngWrap;
}

You need to use the cURL library to send this request.

<?php
// Your ID and token
$blogID = '8070105920543249955';
$authToken = 'OAuth 2.0 token here';

// The data to send to the API
$postData = array(
    'kind' => 'blogger#post',
    'blog' => array('id' => $blogID),
    'title' => 'A new post',
    'content' => 'With <b>exciting</b> content...'
);

// Setup cURL
$ch = curl_init('https://www.googleapis.com/blogger/v3/blogs/'.$blogID.'/posts/');
curl_setopt_array($ch, array(
    CURLOPT_POST => TRUE,
    CURLOPT_RETURNTRANSFER => TRUE,
    CURLOPT_HTTPHEADER => array(
        'Authorization: '.$authToken,
        'Content-Type: application/json'
    ),
    CURLOPT_POSTFIELDS => json_encode($postData)
));

// Send the request
$response = curl_exec($ch);

// Check for errors
if($response === FALSE){
    die(curl_error($ch));
}

// Decode the response
$responseData = json_decode($response, TRUE);

// Close the cURL handler
curl_close($ch);

// Print the date from the response
echo $responseData['published'];

If, for some reason, you can't/don't want to use cURL, you can do this:

<?php
// Your ID and token
$blogID = '8070105920543249955';
$authToken = 'OAuth 2.0 token here';

// The data to send to the API
$postData = array(
    'kind' => 'blogger#post',
    'blog' => array('id' => $blogID),
    'title' => 'A new post',
    'content' => 'With <b>exciting</b> content...'
);

// Create the context for the request
$context = stream_context_create(array(
    'http' => array(
        // http://www.php.net/manual/en/context.http.php
        'method' => 'POST',
        'header' => "Authorization: {$authToken}\r\n".
            "Content-Type: application/json\r\n",
        'content' => json_encode($postData)
    )
));

// Send the request
$response = file_get_contents('https://www.googleapis.com/blogger/v3/blogs/'.$blogID.'/posts/', FALSE, $context);

// Check for errors
if($response === FALSE){
    die('Error');
}

// Decode the response
$responseData = json_decode($response, TRUE);

// Print the date from the response
echo $responseData['published'];

For my first go at this I tried the same thing, and figured out pretty quick that JSON and HTMX is a bit of a square peg/round hole thing. You _can_ get this to work, but you should probably just use form/input elements to store the values you want to pass around. From the docs and general vibes, it feels like a more natural way to interface with HTMX. How you go about this depends a bit on your templating language. I'm still working this out myself, so this example could be completely whack (anyone with more exp pls chime in) Disable If the wrapping form messes things up, you can put the input inside the button and use hx-include="this" or something along those lines. If the API is expecting JSON and JSON only, then yeah, you'll need to look more into json-enc. Make sure you're 'installing' the extension, as per README here: https://github.com/bigskysoftware/htmx-extensions/blob/main/src/json-enc/README.md Edit: For anyone else hitting this later needing to send actual JSON, u/langbuilder made a `json-enc` alternative here: https://www.reddit.com/r/htmx/comments/1igqikp/new_htmx_extension/