Use this tag for questions related to nlohmann JSON C++ library
nlohmann JSON is a header-only JSON class for Modern C++ (C++11)
Latest release: 3.9.1 released on 2020-08-06
See the github project
Questions tagged [nlohmann-json]
248 questions
0
votes
1 answer
nlohmann JSON C++ Include issue
I'm currently having an issue to where visual studio code is not recognizing the include of the json.hpp file no matter what I do in the IDE, I don't admittedly know if the issue is being caused by the IDE, my own silly mistake, or by the way the…
tommy61157
- 164
- 2
- 13
0
votes
0 answers
Why is the 2nd time I try to change my JSON to string not working(the output window won't show up, even I have breakpts or getchar)?.
I am trying to convert my JSON object to a string in test case 1 and 4. When test case 4 is removed, the code works properly, like the output shows up. But when I include test case 4, the code won't run. VS Code says segmentation error. I tried…
RSA
- 1
0
votes
2 answers
How to read JSON content as it is in C++?
I am trying read a text file which has Valid JSON content but not string. The below code works fine if it is a string dump. For example - if file contents are like this "{ \"happy\": true, \"pi\": 3.141 }" then it will parse without errors. Now I…
ajayramesh
- 3,576
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- 75
0
votes
2 answers
JSON parsing using nlohmann json
I am trying to parse the JSON structure using nlohmann's json.hpp
. But I am not to create the JSON structure from the string. I have tried all the way, but still it is failing.
My requirement is to:
1) Create the JSON structure from the…
Hemant Yadav
- 307
- 1
- 4
- 19
0
votes
1 answer
c++ return type of function returning json array via nlohmann json.hpp
I am parsing a json file using nlohmann's json.hpp. The part of the json file I am concerned with looks like this:
"image_captureOptions": {
"captureInterval" : 1000,
"captureLimit" : 5,
"imageExtension" : "jpg",
"imageResizeDims" :…
interwebjill
- 920
- 13
- 38
0
votes
2 answers
C++ nonlohmann json read child object
i'm actually working on a little program and i need to read a json file.
i'm using C++ and the nlohmann json libraries.
My current code
int main(int argc, const char** argv){
ifstream ifs("Myjson.json");
json j = json::parse(ifs);
cout…
user8639911
0
votes
2 answers
How to properly parse JSON objects in a Java+C++ TCP connection?
So I want to have a TCP connection between a Java client and a C++ server. Think of the client as an input device and the C++ server should receive JSON objects, parse them and use them in a game.
It seems like the connection is established…
Joana
- 23
- 3
-1
votes
1 answer
-1
votes
1 answer
nlohmann json insert object in array
The json file is:
{
"vis.DataSet": [],
"backup": []
}
I want to insert 2 objects {a=1,b=2,c=3} and {a=4,b=5} to "vis.DataSet" key.
Then the json become as
{
"vis.DataSet": [
{
"a" : 1,
"b" : 2,
"c" : 3
},
{
"a" : 4,
…
minjiew
- 1
- 1
-1
votes
1 answer
How to insert an object into an object with nlohmann json library
I am unable to insert a JSON object into another object using c++ library “nlohmann json”. An array is inserted instead of an object. I want to get And it turns out
The code I am using:
playersSkins.push_back(json::object_t::value_type(playerName,…
Er2n
- 1
- 2
-1
votes
1 answer
erasing nlohmann::json object during iteration causes segmentation fault
I have a simple database consisting of objects with strings containing unix time as keys and strings containing instructions as values
I want to iterate though the database and erase any object who's key is smaller that current time ( so erase…
Serfer
- 3
- 1
-1
votes
1 answer
How to get size of nlohmann json object in memory?
How do I get the size of nlohmann object in memory in bytes?
The .size() operator gives the number of elements.
I have a lot of sub keys and elements.
What can I do to find it?
Sreeraj Chundayil
- 5,548
- 3
- 29
- 68
-1
votes
1 answer
Converting to data structure using from_json
I have the below program where I am trying to parse one json into a structure.
See that I am the structure Address which I am trying to load from the json string.
However there is some exception.
#include
#include
using…
Soumyajit Roy
- 463
- 2
- 8
- 17
-1
votes
1 answer
Loop over json array items
I have a C++ code with an nlohmann::json array-type object. So it kinda looks…
conni
- 67
- 6
-1
votes
1 answer
Writing to a JSON file using c++?
Suppose I have a JSON object as follows :
{
"Tickets": [
{
"Name" : "Alice Parker",
"Age" : "21",
}
]
}
The above text is from a Names.json file.
I want to append more objects into Tickets…
Kartikey Vaish
- 5
- 2