I think should implement an parser function

[mlkt]

I see an issue #801

I think should implement an parser function, for example:
char* data = ....; //read from network or other data source;
size_t data_len = ....; //known when read data.
json j = parse_json(data, data_len);

call parse_json() is zero-copy, no need to convert to std::string.

[nlohmann]

We already have this, but it may be a bit hidden. You would need to write

json j = parse_json({data, data_len});

Explanation: We use input adapters for the parser, and {data, data_len} constructs one with the signature

input_buffer_adapter(const char* b, const std::size_t l)

It uses the buffer and does not make copies.

I really need to improve the documentation on this...

[mlkt]

OK, it looks well, thank you!