bfj

What is bfj?

The bfj (Big Friendly JSON) npm package is designed to handle large JSON files efficiently. It provides functions to parse and stringify JSON asynchronously, which helps in managing large datasets without blocking the Node.js event loop. This is particularly useful for server-side applications where performance and non-blocking operations are critical.

What are bfj's main functionalities?

Parse JSON asynchronously

This feature allows asynchronous parsing of JSON files. The 'read' method returns a promise that resolves with the parsed JSON data, making it suitable for large files that could block the event loop if parsed synchronously.

const bfj = require('bfj');
bfj.read('./large-file.json').then(data => {
  console.log(data);
}).catch(err => {
  console.error('Error parsing JSON!', err);
});

Stringify JSON asynchronously

This feature allows for asynchronous JSON stringification. The 'write' method writes JSON data to a file asynchronously and returns a promise, which is useful for handling large amounts of data without freezing the server.

const bfj = require('bfj');
const data = { large: 'data' };
bfj.write('./output.json', data).then(() => {
  console.log('Data has been written successfully');
}).catch(err => {
  console.error('Error writing JSON!', err);
});

Stream JSON data

This feature supports streaming JSON data using 'walk', which processes a stream of JSON data and returns a promise. It is ideal for processing data that is too large to fit into memory all at once.

const bfj = require('bfj');
const fs = require('fs');
const stream = fs.createReadStream('large-input.json');
bfj.walk(stream).then(data => {
  console.log('Streamed JSON data:', data);
}).catch(err => {
  console.error('Error streaming JSON!', err);
});

Other packages similar to bfj

jsonstream

jsonstream is a package that provides similar functionalities to bfj, focusing on streaming JSON objects. Unlike bfj, which offers both parsing and stringifying, jsonstream primarily deals with transforming streams of JSON data.

stream-json

stream-json offers tools for parsing and streaming JSON files in a memory-efficient manner. It is similar to bfj but provides more granular control over the streaming process, such as filtering and mapping streams of JSON objects.

README

BFJ

Big-friendly JSON. Work in progress, proper release being published soon.