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jsonfile (4.0.0)

Published 2026-02-24 13:59:23 +00:00 by atheaadmin

Installation

Setup this registry in your project .npmrc file:

registry=

To install the package using npm, run the following command:

npm install jsonfile@4.0.0

or add it to the package.json file:

"jsonfile": "4.0.0"

For more information on the npm registry, see the documentation.

About this package

Node.js - jsonfile

Easily read/write JSON files.

Why?

Writing JSON.stringify() and then fs.writeFile() and JSON.parse() with fs.readFile() enclosed in try/catch blocks became annoying.

Installation

npm install --save jsonfile

API

readFile(filename, [options], callback)

options (object, default undefined): Pass in any fs.readFile options or set reviver for a JSON reviver.

• throws (boolean, default: true). If JSON.parse throws an error, pass this error to the callback. If false, returns null for the object.

var jsonfile = require('jsonfile')
var file = '/tmp/data.json'
jsonfile.readFile(file, function(err, obj) {
  console.dir(obj)
})

readFileSync(filename, [options])

options (object, default undefined): Pass in any fs.readFileSync options or set reviver for a JSON reviver.

• throws (boolean, default: true). If an error is encountered reading or parsing the file, throw the error. If false, returns null for the object.

var jsonfile = require('jsonfile')
var file = '/tmp/data.json'

console.dir(jsonfile.readFileSync(file))

writeFile(filename, obj, [options], callback)

options: Pass in any fs.writeFile options or set replacer for a JSON replacer. Can also pass in spaces and override EOL string.

var jsonfile = require('jsonfile')

var file = '/tmp/data.json'
var obj = {name: 'JP'}

jsonfile.writeFile(file, obj, function (err) {
  console.error(err)
})

formatting with spaces:

var jsonfile = require('jsonfile')

var file = '/tmp/data.json'
var obj = {name: 'JP'}

jsonfile.writeFile(file, obj, {spaces: 2}, function(err) {
  console.error(err)
})

overriding EOL:

var jsonfile = require('jsonfile')

var file = '/tmp/data.json'
var obj = {name: 'JP'}

jsonfile.writeFile(file, obj, {spaces: 2, EOL: '\r\n'}, function(err) {
  console.error(err)
})

appending to an existing JSON file:

You can use fs.writeFile option {flag: 'a'} to achieve this.

var jsonfile = require('jsonfile')

var file = '/tmp/mayAlreadyExistedData.json'
var obj = {name: 'JP'}

jsonfile.writeFile(file, obj, {flag: 'a'}, function (err) {
  console.error(err)
})

writeFileSync(filename, obj, [options])

options: Pass in any fs.writeFileSync options or set replacer for a JSON replacer. Can also pass in spaces and override EOL string.

var jsonfile = require('jsonfile')

var file = '/tmp/data.json'
var obj = {name: 'JP'}

jsonfile.writeFileSync(file, obj)

formatting with spaces:

var jsonfile = require('jsonfile')

var file = '/tmp/data.json'
var obj = {name: 'JP'}

jsonfile.writeFileSync(file, obj, {spaces: 2})

overriding EOL:

var jsonfile = require('jsonfile')

var file = '/tmp/data.json'
var obj = {name: 'JP'}

jsonfile.writeFileSync(file, obj, {spaces: 2, EOL: '\r\n'})

appending to an existing JSON file:

You can use fs.writeFileSync option {flag: 'a'} to achieve this.

var jsonfile = require('jsonfile')

var file = '/tmp/mayAlreadyExistedData.json'
var obj = {name: 'JP'}

jsonfile.writeFileSync(file, obj, {flag: 'a'})

License

(MIT License)

Copyright 2012-2016, JP Richardson jprichardson@gmail.com

Dependencies

Development Dependencies

ID	Version
mocha	2.x
rimraf	^2.4.0
standard	^10.0.3

Optional Dependencies

ID	Version
graceful-fs	^4.1.6

Keywords

read write file json fs fs-extra

Details

npm

2026-02-24 13:59:23 +00:00

0

JP Richardson

Project Site

MIT

5.1 KiB

Assets (1)

jsonfile-4.0.0.tgz 5.1 KiB

Versions (2) View all

4.0.0 2026-02-24

6.2.0 2026-02-24