Cannot serialize and immediatly deserialize json to/from bson

[eike-fokken]

What is the issue you have?

When compiling the following code with the latest development branch

#include <iostream>
#include <nlohmann/json.hpp>

using json = nlohmann::json;

int main() {

  json input;
  input["test"] = "toast";

  std::vector<uint8_t> output = json::to_ubjson(input);
  json j = json::from_bson(output);

  std::cout << j << std::endl;

  return 0;
}

I get an error like

libc++abi: terminating with uncaught exception of type nlohmann::detail::parse_error: [json.exception.parse_error.110] parse error at byte 17: syntax error while parsing BSON cstring: unexpected end of input

This code simply combines the examples from json::to_ubson and json::from_ubson.
Therefore I guess one of the following:

1. I made a mistake
2. The examples in these two functions should be updated
3. There is a bug in the library.

What is the expected behavior?

I think, this should work and write out

{
"test:"toast"
}

Which compiler and operating system are you using?

• Compiler: both clang++ 11 and g++ 10
• Operating system: Debian

Which version of the library did you use?

• latest release version 3.9.1
• other release - please state the version: ___
• the develop branch

In case it is 1. from above, please let me know. If it is one of the others, I'm happy to help debug this, if that's useful.

[nlohmann]

You serialize to UBJSON, but then parse the result as BSON. That does not work.

[eike-fokken]

Oh, silly me.
Sorry for bothering you.