How to parse a json response (e.g. a json array) in ue4 c++ context.

ue4-json-parsing.cpp

/**
 * Include the PrivateDependencyModuleNames entries below in your project build target configuration:
 * PrivateDependencyModuleNames.AddRange(new string[] { "Json", "JsonUtilities" });
 */

#include "Runtime/Online/HTTP/Public/Http.h"
#include "Serialization/JsonSerializer.h"

FHttpResponsePtr Response;

{
    // Single json value (any of supported json types e.g.
    // object with properties, array, bool) at top level of json
    TSharedPtr<FJsonValue> JsonValue;

    // Create a reader pointer to read the json data
    TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(Response->GetContentAsString());

    // Deserialize the json data given Reader and the actual object to deserialize
    if (FJsonSerializer::Deserialize(Reader, JsonValue)) {
        // Get the value of the json object by field name
        bool status = JsonValue->AsObject()->GetBoolField("status");
    }
}

{
    // Array of json objects at top level of json
    TSharedPtr<FJsonObject> JsonObject;

    // Create a reader pointer to read the json data
    TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(Response->GetContentAsString());

    // Deserialize the json data given Reader and the actual object to deserialize
    if (FJsonSerializer::Deserialize(Reader, JsonObject)) {
        // Get the value of the json object by field name
        FString name = JsonObject->GetStringField("name");
    }
}

{
    // Array of json objects at top level of json
    TArray<TSharedPtr<FJsonValue>> JsonArray;

    // Create a reader pointer to read the json data
    TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(Response->GetContentAsString());

    // Deserialize the json data given Reader and the actual object to deserialize
    if (FJsonSerializer::Deserialize(Reader, JsonArray)) {
        //Get the value of the json object by field name
        FString name = JsonArray[0]->AsObject()->GetStringField("name");
    }
}

Thank you very much for this example of json array parsing.

It inspired me, and you saved my day with this.

Thank you too!