node package manager


Save and load JSON to and from disk.

Build Status


Save and load JSON to and from disk.

jsave adds a non enumerable save method to objects and arrays. Once you call jsave({}), the object then has a save method. This means you can treat your data like you normally would, and when you're ready to save your changes to disk, just call save(). It's really that simple.

You can also load data from an existing file by calling jsave.load(filePath);.

Both save and load are unobtrusive. The file path you provide will be created in the event it doesn't exist. Attempting to save or load to a directory will throw an error.

Because jsave adds a save method to your data, only objects and Arrays are allowed. Allowing primitives doesn't make much sense, but if you can find a way to make it so, please issue a pull request!


Saving data

Here you can see that jsave does not change the way you interact with your data. jsave adds a non enumerable #save method to objects and arrays.

var jsave = require('jsave');
var file = '/tmp/some-file';//some-file doesn't exist yet 
var myData = {};
jsave(myData).to(file);//now some-file exists and is empty 
myData.sushi = 'rolled';;//some-file now contains '{"sushi":"rolled"}'; 

Loading a new file

Here we'll load a file that doesn't exist yet. jsave will create the file for us and return an object. Once we save the object, future calls to this file will load our data.

var jsave = require('jsave');
var myData = jsave.load('/tmp/file-i-want');
  myData.burritos = [];
  myData.burritos.push({name:'Beacon', type:'breakfast'});
// /tmp/file-i-want now contains: 

Loading an existing file

Here we'll load some existing JSON that's already on disk.

var jsave = require('jsave');
var myData = jsave.load('/tmp/some-other-file'); = 'ahhhh';;//as you would expect, /tmp/some-other-file now has boo ahhhh :) 


The MIT License (MIT)
Copyright (c) 2014 Joseph Spencer
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.