simdjson is a high-performance, header-only C++ library designed for parsing, querying, and serializing JSON data with minimal memory overhead. It functions as a hardware-aware data processing engine that leverages vector instructions to achieve gigabyte-per-second parsing speeds. By detecting host processor capabilities at runtime, the library automatically selects the most efficient instruction sets to accelerate structural analysis and validation.
The library distinguishes itself through a focus on extreme efficiency and resource management. It utilizes memory mapping and padded buffer alignment to minimize data copying, while its lazy parsing capabilities allow for the extraction of values without requiring a full document tree to be built in memory. For large-scale workloads, it supports incremental stream processing and provides result-based error handling to ensure predictable, safe operations without the use of exceptions.
Beyond its core parsing engine, the library offers a comprehensive suite of tools for data navigation and manipulation. Users can interact with JSON content through DOM-based structures, standard iterators, or direct path-based access. It also includes utilities for programmatic document construction, custom type mapping, and serialization, all while maintaining strict constraints on memory usage and nesting depth to ensure stability during high-throughput tasks.
