[#nlohmann-operator_lshift-01]
= xref:nlohmann.adoc[nlohmann]::operator<<
:relfileprefix: ../
:mrdocs:

serialize to stream

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::ostream&
operator<<(
    std::ostream& o,
    xref:nlohmann/basic_json-00.adoc[basic_json] const& j);
----

== Return Value

Reference to the current output stream

== Parameters

[cols=2]
|===
| Name
| Description
| *o*
| An output stream
| *j*
| The object to output
|===


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