How to check if key present in nested json in c++ using nlohmann
There is a member function contains that returns a bool indicating whether a given key exists in the JSON value.
Instead of
auto subjectIdIter = response.find("subject_id");if (subjectIdIter != response.end()){ cout << "it is found" << endl;}else{ cout << "not found " << endl;}You could write:
if (response.contains("subject_id"){ cout << "it is found" << endl;}else{ cout << "not found " << endl;}
use find including images and candidates and check:
if (response["images"]["candidates"].find("subject_id") != response["images"]["candidates"].end())
Candidates is an array, so you just need to iterate the objects and call find.
bool found = false;for( auto c: response.at("images").at("candidates") ) { if( c.find("subject_id") != c.end() ) { found = true; break; }}