use JSON schema to validate params

defaults.yml

validation_schemata:
  data:
    type: array
    minItems: 1
    maxItems: 1000
    items:
        type: integer
        format: int64
        minimum: 1

Model.pm

sub update {
    my $self = shift;

    my $data = $self->req->json;
    return $self->render(
        json => {
            success => \0,
            error   => "No data provided",
        }
    ) unless $data;

    my @validation_errors = data_validator()->validate($data);
    return $self->render(
        json => {
            success => \0,
            error   => "@validation_errors",
        }
    ) if scalar @validation_errors;
    # ...
}

sub data_validator {
    state $validator = (sub {
        my $instance = JSON::Validator->new;
        $instance->schema( YourCompany::Config->validation_schemata->{data} );
        $instance;
    })->();
    $validator;
}