@nickadam/kv
v1.1.8
Published
A node key value store backed by sqlite that supports expiring keys
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@nickadam/kv
A simple key value database backed by sqlite3
Features
- Auto-expiring entries
- Wildcard matching
- Synchronous and asynchronous formats
- In-memory database (great for testing)
- Store and retrieve native objects (no need to serialize)
Installation
npm install @nickadam/kv
Usage
Examples
Sync
const kv = require('@nickadam/kv')('/path/to/file.db')
kv.set('mykey', {stuff: 'things'})
const data = kv.get('mykey')
console.log(data) // {stuff: 'things'}
kv.quit()
Async
const kv = require('@nickadam/kv')('/path/to/file.db')
kv.set('mykey', {stuff: 'things'}, err => {
if(err) return err
kv.get('mykey', (err, data) => {
kv.quit()
console.log(data) // {stuff: 'things'}
})
})
Set entries to expire using the ttl
option.
kv.set('mykey', {stuff: 'things'}, {ttl: 10}) // expires in 10 seconds
Get a list of values matching keys with the wildcard *
.
kv.set('mykey', {stuff: 'things'})
kv.set('yourkey', 100)
const data = kv.get('*key')
console.log(data) // [{stuff: 'things'}, 100]
Get the metadata associated with entries using the metadata
option.
kv.set('mykey', {stuff: 'things'})
const data = kv.get('mykey', {metadata: true})
console.log(data)
/*
{
k: 'mykey',
v: { stuff: 'things' },
ttl: -1,
timestamp: '2021-06-06 12:27:58'
}
*/
Delete entries
kv.del('mykey')
kv.del('mykey', err => {
// check err and do stuff
})
Use an ephemeral in-memory database with the path :memory:
const kv = require('@nickadam/kv')(':memory:')
More information
*
are not permitted in key names.
Expired entries are deleted at startup. For long running applications, a background job will delete expired entries once a minute - so long as you do not execute kv.quit()
. Expired entries that have not yet been deleted will not return.
Values are encoded and decoded using JSON.stringify
and JSON.parse
.
This database was built using these amazing projects: