# writeJson(file, object, [options, callback])

Writes an object to a JSON file.

**Alias:** `writeJSON()`

- `file` `<String>`
- `object` `<Object>`
- `options` `<Object>`
  - `spaces` `<Number|String>` Number of spaces to indent; or a string to use for indentation (i.e. pass `'\t'` for tab indentation). See [the docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#The_space_argument) for more info.
  - `replacer` [JSON replacer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#The_replacer_parameter)
  - Also accepts [`fs.writeFile` options](https://nodejs.org/api/fs.html#fs_fs_writefile_file_data_options_callback)
- `callback` `<Function>`

## Example:

```js
const fs = require('fs-extra')

fs.writeJson('./package.json', {name: 'fs-extra'}, err => {
  if (err) return console.error(err)

  console.log('success!')
})

// With Promises
fs.writeJson('./package.json', {name: 'fs-extra'})
.then(() => {
  console.log('success!')
})
.catch(err => {
  console.error(err)
})
```

---

**See also:** [`outputJson()`](outputJson.md)