I often type the japanese pronunciation instead of of the english meaning (also the other way round, but usually that doesn’t get accepted). I’d say that accounts for about 1/3 of my incorrect answers and it would be great if there were just a prompt to alert you to the mistake and let you input again!
You can use the Double Check script to re-type your answer! If you’re on your smartphone, I think both Flaming Durtles for Android and Tsurukame for iOS (apps) have build in undo functionality.
Script: WaniKani Lesson User Synonyms 2
Adds User Synonyms to the lesson page.
Adds User Synonyms and Notes to unlearned item pages.
Quote from the original thread:
Because User Synonyms and Notes cannot be read from the WK server until lesson quiz completion anything input with this script is stored in local browser storage. This means of course that it only works if you use a single browser for WK. It is intended for use on items for which you will complete the lesson quiz relatively soon…