Brandon

<p><strong>This plugin is now deprecated, please use WordPress Access Control for access to new features, such as restrict to members or non-members, restrict to certain roles and specify a redirect URL. This name didn’t suite the version 2.0.</strong></p>
<p>https://wordpress.org/extend/plugins/wordpress-access-control/</p>
<p>This plugin allows you to mark a page as “Members Only”. Once this is done, the user must login to view the page. However, you can still add the page to the menu, and it will then ONLY show up if the user is authenticated. That way you can have more items for logged in members on your website.</p>
<p>This plugin is designed for people using WordPress as a CMS. It’s extremely easy to use. You install the plugin, and activate it. Whenever you create or edit a page there is a checkbox on the sidebar that allows you to mark that page as members only.</p>
<p>This plugin now fully supports wp_nav_menu and wp_page_menu for older sites, so it should be compatible with older versions of WordPress, as well as wp_list_pages for certain themes.</p>
<p>It automatically sets the walker class to the one we custom made so theme developers don’t need to do anything</p>


Members Only Menu Plugin

This plugin allows you to mark a page as "Members Only" and still add it to menus (Only visible if logged in)

Braad

<p>Got a WordPress install that serves only as the data layer and/or admin UI of your web application?</p>
<p>This plugin will effectively turn off all default front end output, redirect all front end urls to the main site url, and optionally display a message of your choice. The message can be a simple plain text message or you can use the included filters to completely control the HTML output.</p>
<p>All activity in the wp-admin and all requests for assets like images, scripts, files, etc. will be unaffected by this plugin. Only requests that go through the <code>template_redirect</code> action will be affected.</p>
<h4>Message Output</h4>
<p>Rather than contaminate the data structures you might be using for your application (like posts and pages) this plugin includes a settings page with a simple textarea box where you can save any basic message you want to show. The message content is stored in the options table, and the textarea supports all the same HTML that you can use in post content.</p>
<p>You can use the <code>only_rest_api_page_content</code> filter to include any custom HTML output you want inside the <code><body></code> tags, or you can use the <code>only_rest_api_page_html</code> filter to completely replace all HTML output of the message page, including the <code><html></code> and <code><head></code> tags.</p>
<p>There is also an <code>only_rest_api_page_css</code> filter that allows you to override the 5 lines of CSS this plugin includes to center the message on the page.</p>
<p>If you want a hook added or have a feature request let me know. Pull requests are welcome <a href="https://github.com/BraadMartin/only-rest-api" title="Only REST API on Github" rel="nofollow ugc">on Github</a>.</p>
<h4>Filter Examples</h4>
<p>Use custom HTML inside the <code><body></code> tags:</p>
<pre><code>add_filter( 'only_rest_api_page_content', 'xxx_page_content' );
function xxx_page_content( $content ) {

    $content = '<div class="custom-output">Sorry, I Only Speak REST. Please try again at a proper endpoint.</div>';

    return $content;
}
</code></pre>
<p>Add custom CSS to the default output:</p>
<pre><code>add_filter( 'only_rest_api_page_css', 'xxx_page_css' );
function xxx_page_css( $css ) {

    $css .= '.page-content { color: red; font-size: 72px; }';

    return $css;
}
</code></pre>
<p>Replace the entire HTML output for the page:</p>
<pre><code>add_filter( 'only_rest_api_page_html', 'xxx_page_html' );
function xxx_page_html( $html ) {

    ob_start();

    ?>
    <!doctype html>
    <html lang="">
        <head>
            <meta charset="utf-8">
            <meta http-equiv="x-ua-compatible" content="ie=edge">
            <title>Call me back over the REST API yo!</title>
            <meta name="description" content="">
            <meta name="viewport" content="width=device-width, initial-scale=1">
            <link rel="stylesheet" type="text/css" href="your-awesome-stylesheet.css">
            <script type="text/javascript">
                // Do neat stuff...
            </script>
        </head>
        <body>
            <div class="page-content">
                Ain't nobody got time for non-REST API requests. Please try again at a proper endpoint. :)
            </div>
        </body>
    </html>
    <?php

    $html = ob_get_clean();

    return $html;
}
</code></pre>


Only REST API

Redirects all front end, non-REST API requests to a single page.

Members Only Menu Plugin vs Only REST API