Why is the data not being written to the file?

Question

JavaScript

Hello! Please help me figure out why it is not possible to write data to the file.
The data.json file is in the same folder as the script.
The console gives a null response.
Why does not write down, I'll never know.

const fs = require("fs-extra");
fs.outputJson("./data.json", {name: 'JP'}, err => console.log(err))

data.json

[
  {
    "input": "абвгдеёжзийклмнопрстуфхцчшщъыьэюя",
    "output": "normal"
  },
  {
    "input": "абвгдеёжзийклмнопрстуфхцчшщъыьэюя",
    "output": "normal"
  }
]

Answer 1

In general, I figured it out. The function works, the problem was in the file path.

Answer 2

Here there is an example that returns null and which, apparently, write data