How to validate data?

[Agnostion]

How can I check on the backend side whether the received content matches the editor settings?

For example, with indents. If I set a step of 40px, then how can I check on the backend side in the right way that the user received exactly 40px in indentation? Is there some way out of the box so that I can create an editor on the back side with specific settings, load content into it and check it for compliance with the settings?

If this is not the case, then I will be glad to receive any advice or examples from your experience, thank you.

Thank you for your editor and the time spent on it, it is very valuable!

[Witoso]

How can I check on the backend side whether the received content matches the editor settings? For example, with indents. If I set a step of 40px, then how can I check on the backend side in the right way that the user received exactly 40px in indentation?

Could explain the why? It's cannot grasp the use case here. What do you mean by: the user received exactly 40px in indentation?