can function dump() return string in the order I push in the json object ?

[zyinter2008]

the program like this:
json obj = { {"result", "OK"}, {"model", "AAA" } };
string str = obj.dump();
which i want get { {"result", "OK"}, {"model", "AAA" } }, but it always return { {"model", "AAA" }, {"result", "OK"} }

[nlohmann]

This is not possible. JSON objects are, by definition, unordered set of key-value pairs. In the library, I use a std::map to store objects, so the keys are always ordered alphabetically. You may want to try if you use https://github.com/nlohmann/fifo_map as object_t.

[ivakyb]

How to replace std::map with fifo_map?

[ivakyb]

See https://github.com/nlohmann/json#notes, last item about insertion order of object elements.