passes method

@override FutureOr<bool> passes(ValidationContext context)

Validates the value using the given context.

Returns true if valid, otherwise false.

Implementation

@override
FutureOr<bool> passes(ValidationContext context) {
  final value = context.value;
  if (value == null) return false;
  if (value is! String) return false;

  try {
    jsonDecode(value);
    return true;
  } catch (e) {
    return false;
  }
}