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levelup

Fast & simple storage - a Node.js-style LevelDB wrapper

  • 0.5.0-1
  • Source
  • npm
  • Socket score

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Weekly downloads
960K
increased by14.95%
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What is levelup?

LevelUP is a Node.js library that provides a simple interface for interacting with LevelDB, a fast key-value storage library. It allows for efficient storage and retrieval of data, making it suitable for applications that require high-performance data operations.

What are levelup's main functionalities?

Basic Put and Get

This feature allows you to store and retrieve key-value pairs in the database. The `put` method is used to store a value with a specific key, and the `get` method is used to retrieve the value associated with a key.

const level = require('level');
const db = level('./mydb');

// Put a key-value pair
await db.put('name', 'LevelUP');

// Get the value for a key
const value = await db.get('name');
console.log(value); // 'LevelUP'

Batch Operations

Batch operations allow you to perform multiple put and delete operations in a single atomic action. This is useful for making multiple changes to the database efficiently.

const level = require('level');
const db = level('./mydb');

// Perform batch operations
await db.batch()
  .put('name', 'LevelUP')
  .put('type', 'database')
  .del('oldKey')
  .write();

Streams

Streams provide a way to read and write data in a continuous flow. The `createReadStream` method allows you to read all key-value pairs in the database as a stream, which is useful for processing large datasets.

const level = require('level');
const db = level('./mydb');

// Create a read stream
const stream = db.createReadStream();

stream.on('data', ({ key, value }) => {
  console.log(`${key} = ${value}`);
});

Sublevel

Sublevel allows you to create isolated sub-databases within a LevelDB instance. This is useful for organizing data into different namespaces.

const level = require('level');
const sublevel = require('subleveldown');
const db = level('./mydb');
const subdb = sublevel(db, 'sub');

// Put and get in sublevel
await subdb.put('name', 'SubLevelUP');
const value = await subdb.get('name');
console.log(value); // 'SubLevelUP'

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Package last updated on 09 Jan 2013

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