How to handle json files?

[himanshub16]

I tried handling files, but it lead to runtime errors. Could you please help me figure out the bug?

#include <iostream>
#include <fstream>
#include "json.hpp"

using json = nlohmann::json;
using namespace std;
int main()
{
ifstream file ("data.json", ios::in | ios::ate);
if (!file.is_open()) return 1;

streampos size = file.tellg();
file.seekg(0, ios::beg);
char *memblock = new char[size];
file.read(memblock, size);
file.close();

json data = json::parse(memblock);

// another approach
string s = memblock;
json data = json::parse(s);
// or
json data = json::parse(s.c_str());
...

All three methods to initialize json give runtime error :
terminate called after throwing an instance of 'std::invalid_argument' what(): parse error - unexpected number literal; expected string literal [1] 8754 abort (core dumped) ./a.out

The json file is
{ 1 : { "name": "himanshu" }, 2 : { "name":"shekhar" } }

[himanshub16]

Got it. My JSON files are syntactically wrong.
It should be :
{ "1" : { .. } , "2" : { ... } }

They should be strings. 😞

Sorry to bother you guys.