<itemizedlist>

<listitem>

<para>

<xref linkend="functions-isjson-predicate"/>

<link linkend="functions-isjson-predicate"><literal>IS JSON</literal></link>

</para>

</listitem>

</itemizedlist>

</programlisting>

</para>

<refentry id="functions-isjson-predicate">

<refnamediv>

<refname>IS JSON</refname>

<refpurpose>test whether the provided value is valid JSON data</refpurpose>

</refnamediv>

<sect4 id="functions-isjson-predicate">

<title><literal>IS JSON</literal></title>

<indexterm><primary>is_json</primary></indexterm>

<refsynopsisdiv>

<synopsis>

<replaceable class="parameter">expression</replaceable>

IS <optional> NOT </optional> JSON

<optional> { VALUE | SCALAR | ARRAY | OBJECT } </optional>

<optional> { WITH | WITHOUT } UNIQUE <optional> KEYS </optional> </optional>

</synopsis>

</refsynopsisdiv>

<refsect1>

<sect5>

<title>Description</title>

<para>

</listitem>

</itemizedlist>

</para>

</refsect1>

</sect5>

<refsect1>

<sect5>

<title>Parameters</title>

<variablelist>

</varlistentry>

</variablelist>

</refsect1>

</sect5>

<refsect1>

<sect5>

<title>Examples</title>

<para>

abc | f | t | f | f | f

(5 rows)

</screen>

</refsect1>

</refentry>

</sect5>

</sect4>

</sect3>