[#nlohmann-basic_json-0c-accept-07]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/basic_json-0c.adoc[basic_json]::accept
:relfileprefix: ../../
:mrdocs:

check if the input is valid JSON

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard, deprecated]]
static
bool
accept(
    /* implementation-defined */::span_input_adapter&& i,
    bool const ignore_comments = false,
    bool const ignore_trailing_commas = false);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]: Since 3.8.0; use accept(ptr, ptr + len). Use of this entity is allowed but discouraged.
====
== Return Value

whether the input is valid JSON

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *i*
| input to check
| *ignore_comments*
| whether comments should be ignored and treated like whitespace (`true`) or yield a parse error (`false`)
| *ignore_trailing_commas*
| whether trailing commas in arrays and objects should be ignored (`true`) or yield a parse error (`false`)
|===


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