kv30

A local key/value storage with change watching

Installation

npm i --save kv30

Usage

const kv30 = require('kv30');

await kv30.init();

// load json from ./data/settings.json
const data = await kv30.get('settings'); 

// use and change data
data.newProp='123';

//...
// kv30 will automatically save changes 
// in next 30 seconds to ./data/settings.json
// ...

Motivation for this module

I needed simple and dependence-free data storage for my prof-of-concept projects, that can be replaced with DB or something later. Also I don't mind if I loose data for the last 30 secons.

Technically it is in-memory cache with disk persistance, that watches data change and flushes it to disk.

Readonly case

const data = await kv30.get('settings', {readonly:true}); // returns deeply freezed object

Configuration

const kv30 = require('kv30');
const storageFile = require('kv30/storage.file');
storageFile.setProps({
    dataFolder:'./', // change data folder
});
kv30.init({
    savePeriod: 10, // flush changes every 10 seconds 
    logger: ()=>{}, // no logs about load/save/errors
    readonly: true, // all data is readonly (cannot change and save)
});

Check data health

let data = await kv30.get('settings');

// handling data status
//    readonly  - readonly data
//    changed   - data was changed and it is not saved yet
//    loadError - loading falied; will not save changes
//    saveError - saving failed
//    initError - not initialized (get/set was not called)
if (kv30.getStatus('settings').loadError) {
    data = await kv30.set('settings', {data:[]}); // set default value
}

Custom storage

You can use custom storage, that exports connect, load, save methods (looks at storage.file.js)

await kv30.init({storage: customStorage})

License

MIT