How to write to a json file

1- Call the filesystem

var fs = require('fs')

2- Define the object to be added to the JSON file

var data = {
  name: "rafael"
}

3- Use filesystem's writeFile() function to write into a custom "data.json" file

fs.writeFile("./data.json", JSON.stringify(data), (err) => {
  console.log("write successful", err)
})

Where: JSON.stringify function saves the data as a string

That's it!