I am currently having issues adding additional values to an array of objects.
The iteration seems to work somehow,
but I think I have to use the cjson_arrayforeach function differently
or get rid of some loops.
This my experimental code:

 cJSON *json = cJSON_Parse(buffer);
if (json == NULL) {
const char *error_ptr = cJSON_GetErrorPtr();
if (error_ptr != NULL) {
printf("Error: %sn", error_ptr);
}
cJSON_Delete(json);
return 1;
}

cJSON *iterate = NULL;
cJSON *iterate = NULL;
cJSON_ArrayForEach(iterate,json) {
int count = 0 ;
while(count == 0) {

        cJSON *valuea = cJSON_GetObjectItemCaseSensitive(iterate,"valuea");
        cJSON *valueb = cJSON_GetObjectItemCaseSensitive(iterate, "valueb");
        for(int a = 0; a < cJSON_GetArraySize(json);a++) {

            if(cJSON_IsNumber(valuea)&&cJSON_GetNumberValue(valueb)==58) {

                int va = valuea->valueint;
                int va1 = va >> 8;
                int va2 = va & 256;
                if(a == 0) {
                    cJSON_AddNumberToObject(json->child,"va1",va1);
                    cJSON_AddNumberToObject(json->child,"va2",va2);


                }
                else {
                    cJSON_AddNumberToObject(json->child->next,"va1",va1);
                    cJSON_AddNumberToObject(json->child->next,"va2",va2);

                }
        

            }
        }
        count++;
    }
}

And this is what was added to my JSON file

[{ "valuea":    5434, "Bytes":  1,
 "valueb":  58, "va1":  21, 
"va2":  256, "va1": 240, "va2": 0 },
 { "valuea":    61578, "Bytes": 1, "valueb":    58, 
"va1":  21, "va2":  256, "va1": 21,
 "va2": 256, "va1": 240, "va2": 0,
 "va1": 240, "va2": 0 }, { "valuea":    61258, 
"Bytes":    2, "valueb":    56 }]

There should be just one line of va1 & va2 per object.

I am trying to modify a JSON in C and want to do a calculation for each JSON object.
But the loop runs multiple times.