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()

Sync: writeJsonSync(), writeJSONSync()

Example:

var fs = require('fs-extra')
fs.writeJson('./package.json', {name: 'fs-extra'}, function (err) {
  console.log(err)
})

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See also: outputJson()