Extract one or more values from a buffer of json without parsing the whole thing.

var extract = require('binary-extract');

var buf = new Buffer(JSON.stringify({
  foo: 'bar',
  bar: 'baz',
  nested: {
    bar: 'nope'  
  } 
}));

var value = extract(buf, 'bar');
// => 'baz'

var values = extract(buf, ['foo', 'nested'])
// => ["bar", {"bar":"nope"}]

With the object from bench.js, extract() is ~2-4x faster than JSON.parse(buf.toString()). It is also way more memory efficient as the blob stays out of the V8 heap.

The big perf gain comes mainly from not parsing everything and not converting the buffer to a string.

$ npm install binary-extract

Extract the value of keys in the json buf.

The value can be any valid JSON structure.

If keys is a String, returns a value. If keys is an Array of keys, returns an array of values.

This module is proudly supported by my Sponsors!

Do you want to support modules like this to improve their quality, stability and weigh in on new features? Then please consider donating to my Patreon. Not sure how much of my modules you're using? Try feross/thanks!

MIT