This WaniKani script automatically adds user synonyms to all your unlocked kanji using meaning synonyms collected from Jim Breen's WWWJDIC database.

If you have any pre-existing user synonyms, the script attempts to preserve them. However, WaniKani only allows a maximum of 8 user synonyms per kanji. Any more synonyms beyond that are ignored by the script.

Tampermonkey

1. Install @rfindley 's WaniKani Open Framework according to these instructions.
2. Install this script from Greasyfork at https://greasyfork.org/en/scripts/39692-wanikani-bulk-add-kanji-user-synonyms

Navigate to your dashboard (i.e. either https://www.wanikani.com/ or https://www.wanikani.com/dashboard) and the script will automatically update your user synonyms.

You can set DISABLE_ALL_LOGGING to false and open your browser console to see what the script is doing.

Here is the console output, when I ran this on my account at WaniKani level 19.

• 1.0.0: Initial release
• 1.0.1: Default to not log anything
• 1.0.2: Fix handling of ampersands in WWWJDIC synonyms
• 1.0.3: Redirect to forum page if wkof is not installed.
• 1.0.4: Update description
• 1.0.5: Update script metadata
• 1.0.6: Tweak WKOF user installation prompt code