jsoniter (json-iterator) is fast and flexible JSON parser available in Java and Go. Good deal of the code is ported from dsljson, and jsonparser. Faster, Much Faster! Traditional JSON parsers are slow. Jsoniter Java version could be 3x times faster than jackson/gson/fastjson. If you are doing a lot of log processing or number crunching, but stuck with JSON, you definitely need to consider dsl-json