I Created a URL Shortner

"Also add an option for people to view the target of a URL before they click it, such as adding a + to the end."

Mmm, I like that feature. Will create that.

you need to deal with a lot of edge cases, have a look in your saved URLs.

Also add an option for people to view the target of a URL before they click it, such as adding a + to the end.

But also understand that URL shorteners are considered unsafe due to the lack of transparency on the target.