JsonThrowOnErrorRector

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Adds JSON_THROW_ON_ERROR to json_encode() and json_decode() to throw JsonException on error

-json_encode($content);
-json_decode($json);
+json_encode($content, JSON_THROW_ON_ERROR);
+json_decode($json, null, 512, JSON_THROW_ON_ERROR);

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Php73\Rector\FuncCall\JsonThrowOnErrorRector;

return RectorConfig::configure()
    ->withRules([
        JsonThrowOnErrorRector::class,
    ]);