Snack4 JSON Streaming Parser & Auto-Repair Deep Guide

Snack4 is a high-performance Java JSON library designed for demanding scenarios. Its core component JsonReader uses a non-recursive state machine architecture, natively supporting Streaming Parse and Auto-Repair , making it ideal for handling unstable LLM outputs and large NDJSON files. 1. Streaming Parse: From Bulk to Incremental Traditional parsers require JSON to be complete and loaded into memory at once. Snack4 supports extracting valid data in chunks (Nodes) while the data is flowing. 1.1 Core Scenarios LLM Real-time Rendering : Parse while generating, update UI without waiting for the conversation to end. NDJSON/JSONL : Process multi-line JSON objects from log streams or database exports. Low Memory Processing : When processing GB-level files, memory usage stays at KB-level buffer size. 1.2 Key APIs JsonReader reader = new JsonReader ( jsonStream ); // Method A: Iterator pattern (recommended, most elegant syntax) for ( ONode node : reader . iterableNext ()) { process ( node ); }