streaming_json_parsing

📥 Stream Large JSON Payloads Efficiently

When working with big JSON files, loading the entire content into memory can cause performance bottlenecks or even OOM errors. By using JSON.load on an IO object or a streaming parser like Oj, you can process chunks incrementally without blowing up memory usage.

# Using stdlib JSON to stream from a file
File.open('huge_data.json') do |file|
  JSON.load(file) do |obj|
    # process each top-level object or array element
    handle_record(obj)
  end
end

# Using Oj for event-based streaming
require 'oj'
handler = Class.new do
  def initialize; end
  def hash_start; puts "New object:"; end
  def hash_end; end
  def array_start; end
  def array_end; end
  def add_value(value); handle_record(value); end
end.new

Oj.sc_parse(handler, File.read('huge_data.json'))

This approach lets you parse and process JSON incrementally, reducing peak memory usage.