# NLOHMANN_JSON_NAMESPACE_NO_VERSION - JSON for Modern C++
Author: Niels Lohmann

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# NLOHMANN_JSON_NAMESPACE_NO_VERSION

    #define NLOHMANN_JSON_NAMESPACE_NO_VERSION /* value */

If defined to `1`, the version component is omitted from the inline namespace. See `nlohmann` Namespace for details.

## Default definition

The default value is `0`.

    #define NLOHMANN_JSON_NAMESPACE_NO_VERSION 0

When the macro is not defined, the library will define it to its default value.

## Examples

Example

The example shows how to use `NLOHMANN_JSON_NAMESPACE_NO_VERSION` to disable the version component of the inline namespace.

    #include <iostream>

    #define NLOHMANN_JSON_NAMESPACE_NO_VERSION 1
    #include <nlohmann/json.hpp>

    // macro needed to output the NLOHMANN_JSON_NAMESPACE as string literal
    #define Q(x) #x
    #define QUOTE(x) Q(x)

    int main()
    {
        std::cout << QUOTE(NLOHMANN_JSON_NAMESPACE) << std::endl;
    }

Output:

    nlohmann::json_abi

## See also

- `nlohmann` Namespace
- `NLOHMANN_JSON_NAMESPACE`
- `NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END`

## Version history

- Added in version 3.11.2.

January 1, 2026