garethgillman

This plugin prettifies/beautifies/highlights source code placed inside <code><pre class="prettyprint"></code> tags. It is a light plugin with only 2 files.
New in 3.2.2 – use the hammer icon in the editor to paste your code and automatically have it converted to pretty code.

Syntax Highlighter Lite

This plugin prettifies/beautifies/highlights source code placed inside `` tags. It is a light plugin with only 2 files.

anilpeter75

This plugin adds a “JSON Formatter” tool under the Tools menu in your WordPress admin. It allows you to quickly paste unformatted JSON, click a button, and get beautified, validated output without leaving your site.
For more information or to use the original web-based tool, please visit the <a href="https://formatjsononline.com/" rel="nofollow ugc">official website</a>.

Format JSON Online

A simple tool to format and validate JSON online within your WordPress admin.

Syntax Highlighter Lite vs Format JSON Online