[#nlohmann-basic_json-0c-accept-02]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/basic_json-0c.adoc[basic_json]::accept
:relfileprefix: ../../
:mrdocs:

check if the input is valid JSON (iterator pair, or iterator+sentinel pair for C++20 ranges support)

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename IteratorType,
    typename SentinelType = IteratorType>
requires detail::can_compare_ne<IteratorType, SentinelType>::value
static
bool
accept(
    IteratorType first,
    SentinelType last,
    bool const ignore_comments = false,
    bool const ignore_trailing_commas = false);
----

== Return Value

whether the input is valid JSON

== Parameters

[cols="1,4"]
|===
| Name| Description
| *first*
| iterator to the start of the input
| *last*
| iterator to the end of the input, or a sentinel value comparable to _first_
| *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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