[#boost-urls-url_view_base-params-069]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url_view_base.adoc[url_view_base]::params
:relfileprefix: ../../../
:mrdocs:

Return the query as a container of parameters

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/url_view_base.hpp#L2066[boost/url/url_view_base.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_view.adoc[params_view]
params() const noexcept;
----

== Description

This function returns a bidirectional view of key/value pairs over the query. The returned view references the same underlying character buffer; ownership is not transferred. Any percent‐escapes in strings returned when iterating the view are decoded first.

== Example
[,cpp]
----
params_view pv = url_view( "/sql?id=42&name=jane%2Ddoe&page+size=20" ).params();
----
== Complexity
Constant.

== Exception Safety
Throws nothing.

== BNF
[,cpp]
----
query           = *( pchar / "/" / "?" )

query-param     = key [ "=" value ]
query-params    = [ query-param ] *( "&" query-param )
----
== Specification
* https://datatracker.ietf.org/doc/html/rfc3986#section-3.4[]
* https://en.wikipedia.org/wiki/Query_string[]

== Return Value

A bidirectional view of key/value pairs.

== See Also

xref:boost/urls/url_view_base/encoded_params.adoc[`encoded_params`], xref:boost/urls/url_view_base/encoded_query.adoc[`encoded_query`], xref:boost/urls/url_view_base/has_query.adoc[`has_query`], xref:boost/urls/url_view_base/query.adoc[`query`].


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