Error 302: type must be number, but is it number

[askraskr]

Description

Just compiled and installed the last version of nlohmann_json library with CMake.
I was reading JSON documents from Mongo. Converted Mongo documents to nlohmann_json::jsons.

after compiling and running it, I got this error: type must be number, but is it number.

Reproduction steps

std::vector<nlohmann::json> jsonv;
for (auto cursor = client[db][cl].find(make_document(kvp("_id", make_document(kvp("$gt", bsoncxx::oid(some_id)))))); const auto &doc: cursor) {
        json = std::move(nlohmann::json::parse(bsoncxx::to_json(doc)));
        jsonv.push_back(std::move(json));
    }

Expected vs. actual results

I expected an integer to be printed. As simple as that.

Minimal code example

sample json document from Mongo without _id:
{
    "Latitude": 0,
    "Longitude": 0,
    "PassedTime": 1715948646000,
    "post_timeout_ms": 15000,
    "redirect_count": 0,
}

std::cout << record["PassedTime"].template get<long>() << std::endl;

Error messages

terminate called after throwing an instance of 'nlohmann::json_abi_v3_11_3::detail::type_error'
  what():  [json.exception.type_error.302] type must be number, but is number

Compiler and operating system

Debian with g++-11

Library version

3.11.3

Validation

• The bug also occurs if the latest version from the develop branch is used.
• I can successfully compile and run the unit tests.

[nlohmann]

Can you try with unsigned long?

[askraskr]

I did. After a few hundred records read from Mongo, it failed again with the same error. BTW, all PassedTime values are greater than zero (0).

P.S. How does nlohmann::json work with numbers? What makes a the type of a number nlohmann::json::value_t::number_integer or nlohmann::json::value_t::number_unsigned?

[Ranj8521Kumar]

I want to tackle this issue, please assign this issue to me.

[nlohmann]

Go ahead!

[nlohmann]

I cannot reproduce the issue. Here is my try:

#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;

int main() {
    json record = R"({
"Latitude": 0,
"Longitude": 0,
"PassedTime": 1715948646000,
"post_timeout_ms": 15000,
"redirect_count": 0
})"_json;

    std::cout << record["PassedTime"].template get<long>() << std::endl;
}

Output:

1715948646000