This repository contains two JSON files to map shinjitai (新字体) characters to kyūjitai (舊字體) characters, and vice versa. The data source is from the Jōyō Kanji Table (常用漢字表) from the Agency for Cultural Affairs (文化庁) of Japan.
The kyujitai.json file contains a large table as an JSON object. The keys
are kyūjitai characters (e.g., "體") and each value is its corresponding
shinjitai character (e.g., "体") or null if it's the same form to the
kyūjitai one (e.g., "字": null).
Note that, since some shinjitai characters merged multiple kyūjitai characters into a single character, there are duplicated shinjitai values across different kyūjitai keys.
The kyūjitai keys of this table only consist of characters in the Jōyō Kanji Table.
The shinjitai.json file contains a large table as an JSON object. The keys
are shinjitai characters (e.g., "弁") and each value is an array of its
corresponding kyūjitai characters (e.g., ["辨", "瓣", "辯"]) or null
if it's the same form to the shinjitai one (e.g., "字": null). Every value
must not be an empty array or contain the same character form to the shinjitai
key.