Benchmark tests conducted in 2021 revealed that GSON emerged as the fastest JSON library for both large and small files, outperforming Jackson, JSONP, and JSON.simple, with Java 11 and updated libraries contributing to overall performance improvements since earlier tests in 2017. JSON is a widely used standard for data transmission between servers and web applications, and its performance can vary significantly depending on the library chosen, which is crucial for applications dealing with varying file sizes. In the 2017 benchmarks, Jackson performed best with large files, while GSON excelled in handling small files, with JSON.simple consistently ranking second across different file sizes. However, by 2021, GSON had made significant improvements, securing the top spot in both categories. The choice of JSON library should consider the specific environment and file size requirements, with GSON now being the preferred option for both large and small files, while Jackson remains a strong choice for larger files and JSON.simple as a versatile option for varied environments.