v7 equivalent of validateJson

[higaski]

The v6 documentation contains a small validateJson snippet which I have always found immensely useful:

bool validateJson(const char* input) {
  StaticJsonDocument<0> doc, filter;
  return deserializeJson(doc, input, DeserializationOption::Filter(filter)) == DeserializationError::Ok;
}

Now, the v7 documentation contains an equivalent snippet, but I've red that Static- and DynamicJsonDocument got merged into a single class which now always allocates in 1kB blocks. Does this mean that validateJson now allocates 2x1kB?

bool validateJson(const char* input) {
  JsonDocument doc, filter;
  return deserializeJson(doc, input, DeserializationOption::Filter(filter)) == DeserializationError::Ok;
}

[bblanchon]

Hi @higaski,

The current implementation allocates the memory pools lazily, so an empty JsonDocument doesn't require any heap allocation.

You can confirm that by replacing the allocator:
https://wandbox.org/permlink/p07bfdAXL9johHby

Best regards,
Benoit

[higaski]

Thanks for clearing that up!