Couldn't parse data file 'heaviest_core:azurenths_mace' from 'heaviest_core:recipe/azurenths_mace.js

I'm getting this error, and I don't know how to resolve it. The recipe generator didn't give the option to check for components in an ingredient. So I tried something myself. I might be wrong on that.
"ingredients": [
  {
    "item": "minecraft:heavy_core",
    "components": {
      "minecraft:custom_data": {
        "heaviest_core": 1
      }
    }
  },
  {
    "item": "minecraft:lightning_rod"
  }
],