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Seems like everyone who's written a Node app has also written a JSON file storage module. I guess I'm no exception. Here's my rationale for publishing jdrop:

  • It supports updating only a portion of a JSON file without overwriting changes a concurrent user may have made in another portion of the file.
  • Escapes HTML
  • Uses promises instead of callbacks
  • You can choose an error handling option:
    • Catch a rejected promise
    • Let jdrop autocatch errors
    • Provide your own autocatch handler


const jdrop = require('jdrop')({
        path: 'data',
        autocatch: true
let data = {
    post: {
        body: 'hello'
// save data 
jdrop.put('posts', data).then(posts => {
    // stuff here runs after data is saved 
// update part of a file 
jdrop.put('posts', 'HI!', 'post.body').then(posts => {
    // stuff here runs after data is saved 
// get data 
jdrop.get('items').then(items => {
    // do stuff with items... 
// delete part of a file 
jdrop.del('items', 'key.example[3].item').then(items => {
    // stuff here runs after the file is altered 
// delete a file 
jdrop.del('items').then(() => {
    // stuff here runs after the file is deleted 


When you initialize jdrop, you can pass a config object with two optional settings.

path is the directory in which to store JSON files. The keys you use to access files are paths relative to this directory. The default path is data.

autocatch controlls error handling behavior. The default behavior uses a promise rejection, which you can handle thusly:

jdrop.get('items').then(items => {
    // do stuff... 
}).catch(err => {

If you set autocatch to true, jdrop will no longer reject promises. Instead, it will log the error and end the process with exit code 1.

Alternatively, you can supply a function to the autocatch setting. This function will be passed any error objects that arise. You can use this to send an error to the client without crashing.