I was trying to print the HTML contained in a prop, using dangerouslySetInnerHTML, while I got this error in the browser console:

Warning: Prop `dangerouslySetInnerHTML` did not match.

This was a Next.js project, but the solution applies to any React code.

The string I was trying to print appeared for a while, and then disappeared. Quite strange!

It was even stranger when I tried to print a fixed HTML string, like this:

<p
  dangerouslySetInnerHTML={{
    __html: '<p>test</p>'
  }}></p>

The error message is cryptic but after a while, I realized I could not set a p tag inside another p tag.

Switching to:

<div
  dangerouslySetInnerHTML={{
    __html: '<p>test</p>'
  }}></div>

worked like a charm.

Lessons in this unit:

0:	Introduction
1:	How to handle errors in React
2:	Fix the “Objects are not valid as a React child” error
3:	Fix Uncaught Error Objects are not valid as a React child
4:	How to use useEffect callback with event callbacks
5:	How to debug a React application
6:	▶︎ How to fix the dangerouslySetInnerHTML did not match error in React
7:	React, how to fix the TypeError: resolver is not a function error
8:	How to fix the "cannot update a component while rendering a different component" error in React
9:	Testing React components
10:	How to configure HTTPS in a React app on localhost