If you want to parse more than 4GB of JSON in a browser, ArrayBuffer versus string isn't the most important criteria - you shouldn't parse a 4GB ArrayBuffer as

If you want to parse more than 4GB of JSON in a browser, ArrayBuffer versus string isn't the most important criteria - you shouldn't parse a 4GB ArrayBuffer as a single chunk either. You can always convert between an ArrayBuffer and a string, but you'll want to compare parsers according to the ability to stream, as well as performance and memory efficiency.