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= cowboy_req:body_length(3)
== Name
cowboy_req:body_length - Body length
== Description
[source,erlang]
----
body_length(Req :: cowboy_req:req()) -> undefined | non_neg_integer()
----
Return the length of the request body.
The length is not always known before reading the body.
In those cases Cowboy will return `undefined`. The body
length is available after the body has been fully read.
== Arguments
Req::
The Req object.
== Return value
The length of the request body, or `undefined` if it is
not known.
== Changelog
* *2.0*: Only the length is returned, it is no longer wrapped in a tuple.
* *1.0*: Function introduced.
== Examples
.Get the body length
[source,erlang]
----
Length = cowboy_req:body_length(Req).
----
== See also
link:man:cowboy_req(3)[cowboy_req(3)],
link:man:cowboy_req:has_body(3)[cowboy_req:has_body(3)],
link:man:cowboy_req:read_body(3)[cowboy_req:read_body(3)],
link:man:cowboy_req:read_urlencoded_body(3)[cowboy_req:read_urlencoded_body(3)],
link:man:cowboy_req:read_part(3)[cowboy_req:read_part(3)],
link:man:cowboy_req:read_part_body(3)[cowboy_req:read_part_body(3)]
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