fastjson

Benchmarks show up to 15x faster parsing than Go's standard encoding/json, with detailed metrics for various data sizes, ideal for high-throughput scenarios like RTB.

Parses arbitrary JSON without requiring struct definitions, reflection, or code generation, making it perfect for dynamic or unknown schemas, as highlighted in the features.

Uses single-pass parsing to outperform alternatives like jsonparser and gjson when accessing multiple unrelated fields, reducing overhead by parsing input only once.

Validates JSON during parsing, a feature absent in other fast parsers, ensuring data integrity without additional steps, as noted in the comparison with jsonparser and gjson.