Attach header to all response()->json()->send() laravel;

Create a middleware SetHeader.php

then

<?php

namespace App\Http\Middleware;

use Closure;

class setHeader
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $request->headers->set('X-Header-One', 'Header Value');
        return $next($request);
    }
}

like that you can add as may as headers and apply to those routes which you want to send

Well, the answer to this question is already given, But I suggest using the power of the middleware concept. Middleware is not just working for requests but also works for the response.

By using the response macro we have to change the reference to use a custom function instead of json.

Here is the middleware code.

SetResponseHeaders.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;

class SetResponseHeaders
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        $response = $next($request);
        $response->header('X-Header-One', 'XValue');
        return $response;
    }
}

and don't forget to register the middleware.

Http/Kernel.php

protected $middleware = [
    // other middlewares
    \App\Http\Middleware\SetResponseHeaders::class,
]

Special notes:- If you are using the CORS concept then you have the cors.php file under the config folder. In my case, I am using fruitcake/laravel-cors package. so you have to expose the header otherwise you will not get the value.

cors.php

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | Cross-Origin Resource Sharing (CORS) Configuration
    |--------------------------------------------------------------------------
    |
    | Here you may configure your settings for cross-origin resource sharing
    | or "CORS". This determines what cross-origin operations may execute
    | in web browsers. You are free to adjust these settings as needed.
    |
    | To learn more: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
    |
    */

    // other config

    'exposed_headers' => ['X-Header-One'],
]

In your Controller.php

Add a function and call it whatever you want

EG

public function MyCustomResponse()
{
  ... 
}

Then allow that to take in the params you want, in your case it is an array and an int, (data and status)

public function MyCustomResponse(array $data, int $status)
{
  ... 
}

Then handle the logic in there

public function MyCustomResponse(array $data, int $status)
{
  response()->json($data, $status)->header('X-Header-One', 'Header Value')->send();
}

Now when you want to use it, ensure that you are extending the controller where you have placed this code and just do

return $this->myCustomResponse($data, 200);

A better option depending on your need is to use a middleware

public function handle($request, Closure $next)
{
    $request->headers->set( ... );
    return $next($request);
}

And apply to your route