node-fs-extra/docs/writeJson.md

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

Writes an object to a JSON file. options are the same that you'd pass to jsonFile.writeFile().

Alias: writeJSON()

Example:

const fs = require('fs-extra')

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

  console.log('success!')
})

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See also: outputJson()