Working with JSON

What is JSON

JSON stands for Javascript Object Notation and is a key/value format for saving data on the file system and transferring data between services

// config.json
{
  "location": "us-west",
  "days": 7,
  "levels": ["error", "warn"]
}

Reading JSON

To work with JSON as a javascript object, we use JSON.parse()

js

// read data
const path = new URL('./config.json', import.meta.url)
const data = await fs.readFile(path)

// parse into js object
const obj = JSON.parse(data)
console.log(obj)

output

{
  location: 'us-west',
  days: 7,
  levels: ['error', 'warn']
}

Writing JSON

To write a javascript object to a json file, we use JSON.stringify()

// stringify and write an object to a .json file
await fs.writeFile(path, JSON.stringify(obj))