Gets all item groups of minecraft crafteable items. Requires the decompiled source (https://github.com/PrismarineJS/minecraft-jar-extractor)

minecraft-item-groups.js

const path = require('path')
const fs = require('fs')

const recipesPath = path.join(__dirname, './decompiled/assets/minecraft/recipes/')

const recipeFileNames = fs.readdirSync(recipesPath)

const recipes = recipeFileNames.map(recipeFileName => {
  return ({
    name: recipeFileName,
    data: JSON.parse(fs.readFileSync(path.join(recipesPath, recipeFileName), 'utf-8'))
  })
})

let groups = {

}
for (const recipe of recipes) {
  if (recipe.data.group) {
      if (!groups[recipe.data.group]) groups[recipe.data.group] = []
      groups[recipe.data.group].push(recipe.name)
    }
}

fs.writeFileSync('out.txt', JSON.stringify(groups, null, 2))