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How to check if a value is JSON in Laravel validation?

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To check if a value is a valid JSON string in Laravel validation, you can use the json validation rule. Here’s an example of how to use the json rule:

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

public function validateJson(Request $request)
{
    $validator = Validator::make($request->all(), [
        'json_data' => 'required|json',
    ]);

    if ($validator->fails()) {
        // Handle validation error
        // ...
    }

    // If validation passes, continue with the application logic
    // ...
}

In this example, we’re using the json validation rule to check if the json_data field is a valid JSON string. If the validation fails, we handle the validation error. If the validation passes, we can continue with the application logic.

Note that the json validation rule only checks if the value is a valid JSON string. If you need to check if the JSON string has specific keys or values, you can use the json:keys or json:values validation rules. For example:

$validator = Validator::make($request->all(), [
    'json_data' => 'required|json',
    'json_data.key1' => 'required|string',
    'json_data.key2' => 'required|integer',
]);

In this example, we’re using the json validation rule to check if the json_data field is a valid JSON string, and then using the dot notation to validate that it contains the key1 and key2 keys with the correct data types.

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