[#nlohmann-basic_json-0c-parse-08]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/basic_json-0c.adoc[basic_json]::parse
:relfileprefix: ../../
:mrdocs:

deserialize from a compatible input

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard, deprecated]]
static
xref:nlohmann/basic_json-0c.adoc[basic_json]
parse(
    /* implementation-defined */::span_input_adapter&& i,
    xref:nlohmann/basic_json-0c/parser_callback_t.adoc[parser_callback_t] cb = nullptr,
    bool const allow_exceptions = true,
    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 parse(ptr, ptr + len). Use of this entity is allowed but discouraged.
====
== Return Value

deserialized JSON value, or a discarded value if `allow_exceptions` is `false` and a parse error occurred

[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 read the JSON value from
| *cb*
| a parser callback function of type xref:nlohmann/basic_json-0c/parser_callback_t.adoc[`parser_callback_t`] which is used to control the deserialization by filtering the parsed values
| *allow_exceptions*
| whether to throw exceptions in case of a parse error
| *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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