How Do I Make a JSON Pretty Printer App Using PHP for Development/Debugging Use as a Coder?

Ya'll know you don't wanna be posting your app's JSON responses, which may include sensitive information, to some third party website which could easily or accidentally log this info... think, decrypted passwords might be in your response, API keys, the name of your app. Lot's of stuff ain't nobody but you should see. So here, make your own JSON PRETTY PRINTER using PHP and RUN IT LOCALLY on your comp. Yea boi! Get it!

<?php
$str = <<<'EOT'
{"name_first":"John"}
EOT;
echo json_encode(json_decode($str), JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);

^ Save the file. Name it something such as json-pretty-printer.php and then run it on the command line by typing 'php' then the path to your script. Hit enter. Boom.